ВЫХОДНОЙ КАСКАД СИСТЕМЫ ЗАЖИГАНИЯ

Изобретение предназначено для двигателей внутреннего сгорания с парой Дарлингтона. Каскад содержит активный транзистор Т2 и управляющий транзистор Т1, при этом параллельно участку база-эмиттер пары Дарлингтона включен участок коллектор-эмиттер закорачивающего транзистора Т3, пара Дарлингтона имеет внутреннюю схему фиксации с помощью полупроводникового стабилизатора Z1, включающего параллельно участку коллектор-эмиттер активного транзистора Т2 пары Дарлингтона, и управляющий вывод закорачивающего транзистора через последовательное включение высокоомного защитного сопротивления R3 и полупроводникового стабилитрона Z2 соединен с коллектором пары Дарлингтона, а защитное сопротивление R3 рассчитано таким образом, чтобы для закорачивающего транзистора Т3 проходил базовый ток достаточной величины, причем запирающее напряжение полупроводникового стабилитрона Z2 лежит в диапазоне 20-50 В. Технический результат - повышение надежности. 3 з.п. ф-лы, 6 ил.

ТРАНЗИСТОРНЫЙ КОММУТАТОР

Изобретение относится к электротехнике и может быть использовано в контактно-транзисторных системах зажигания транспортных средств и предназначено для изготовления в интегральном исполнении. Задачей изобретения является повышение надежности устройства путем уменьшения рассеивания мощности на одном силовом транзисторе за счет равномерного распределения ее на нескольких силовых транзисторах. Цель достигается тем, что в устройство вводят n-1 силовых транзистора, подключенных силовыми выводами к соответствующим силовым выводам первого силового транзистора, n запирающих диодов, первые выводы которых подключены к объединенным первым выводам первичной и вторичной обмоток импульсного трансформатора, а вторые выводы соответственно - к базам соответствующих силовых транзисторов транзисторных ключей, первые силовые выводы которых подключены к входному выводу, вторые соответственно через соответствующие токозадающие резисторы - к базам силовых транзисторов, а управляющие выводы - к соответствующим ...

Импульсный ключ с запоминанием сигнала управления

ИМПУЛЬСНЫЙ КЛЮЧ С ЗАПОМИНАНИЕМ СИГНАЛА УПРАВЛЕНИЯ, содержащий инвертор, вход которого является шиной коммутации, первый и второй элементы И1Ш-НЕ, первые входы которых подключены к выходу инвертора, а выходы первого и второго элементов ИПИ-НЕ являются соответственно второй и первой выходными шинами, и парафазные шины управления, отличающийся тем, что, с целью упрощения устройства и увеличения быстродействия, введены первый, второй , третий и четвертьй элементы И-НЕ, причем первые входы первого и второго элементов И-НЕ соединены с входом инвертора, выходы первого и второго элементов И-НЕ соединены с первыми входами соответственно третьего и четвертого элементов И-НЕ, причем вторые входы третьего и четвертого элементов И-НЕ являются парафазными шинами управления, а выходы третьего и четвертого элементов И-НЕ подключены к вторым входам соответственно первого и второго элементов И-НЕ и к вторым входам соответственно первого и второго , элементов ШШ-НЕ.

Аналоговый ключ

Изобретение предназначено для использования в устройствах коммутации в качестве быстродействующего реле. Цель изобретения - повышение быстродействия при коммутации высокоомных цепей. Устройство состоит из двух источников напряжения, управляемых током, протекающим через их выходы, которые являются одновременно выводами аналогового ключа. В цепи обратной связи операционных 1...3 усилителей, на основе которых построены управляемые источники напряжения, использованы ключи на полевых транзисторах 4 и 5. За счет использования обратной связи сопротивление ключей на полевых транзисторах 4 и 5 уменьшается на несколько порядков. 1 ил.

Коммутатор

Изобретение относится к измерительной технике, в частности к адаптивным коммутаторам. Цель изобретения - повышение быстродействия при создании многоточечной измерительной системы за счет осуществления коммутации с учетом анализа входных сигналов. Указанная цель достигается за счет введения триггеров 9 и 10, элементов И 11-15, элементов ИЛИ 16 и 17, элементов задержки 18 и 19, одновибраторов 20 и 21, инвертора 22 путем обеспечения подключения соответствующих информационных входов 28-30 к выходам 31-33 сразу после окончания передачи информации по предыдущему входу. 2 ил.

Коммутатор

Многоканальный коммутатор

Изобретение относится к автоматике и телемеханике и может быть использовано для коммутации цифровой информации между абонентами по двухпроводной линии связи. Цель изобретения - повышение помехоустойчивости, достигаемое путем исключения неконтролируемого блокирования обмена информацией. Коммутатор содержит линии 1.1 - 1.3 связи, приемопередатчики 2.1 - 2.3, первые 3.1 - 3.3 и вторые 4.1 - 4.3 элементы И, триггеры 5.1 - 5.3, блок 6 обмена, первый 7, второй 8 и третий 9 элементы ИЛИ, счетчик 10 и генератор 11 импульсов. Введение второго 8 и третьего 9 элементов ИЛИ, а также счетчика 10 и генератора 11 импульсов обеспечивает автоматический переход многоканального коммутатора в рабочее состояние из состояния неконтролируемого блокирования обмена информацией, возникающего при воздействии помех. 1 ил.

Устройство опроса телеметрических каналов

Frequenzkompensationsschaltung zur Stabilisierung eines Differenzverstärkers mit kreuzgekoppelten Transistoren

Versorgungsspannungsregler für Bootstrapleitung ohne Filterkondensator

DRIVING CIRCUIT FOR N-CHANNEL POWER MOS TRANSISTORS OF PUSH-PULL STAGES

Digital adaptive control of IGBT or MOS gate charging current in a converter for a railway traction motor

The current applied by driver 12 to charge or discharge the gate of an IGBT is adapted from cycle to cycle in dependence on the response of the IGBT measured at a predetermined instant in each cycle. The unit 16 may measure gate-emitter voltage, collector-emitter voltage, collector current or a derivative. The gate drive is incremented or decremented in each cycle until the switching speed lies within a desired band. Obtaining an optimum switching speed reduces switching losses and prevents shoot-through current. The gate current in distinct phases of the charge or discharge cycle can be adapted independently (figures 3 and 4).

CIRCUIT ARRANGEMENT HAVING AN OUTPUT TRANSISTOR FOR THE SWITCHING-ON AND SWITCHING-OFF OF A LOAD

Semiconductor drive circuit

This invention relates to a drive circuit coupled to electrical devices, which may be semiconductors, connected in parallel in a circuit network. The electrical devices have distinct total on-time periods when they are simultaneously energized. The circuit network has a source of power coupled through the parallel connected devices to a load. The drive circuit includes a signal source coupled respectively through a time adjustable circuit to a first electrical device and to a second electrical device. The time adjustable circuit is adjusted such that the total on-time of the first electrical device matches the total on-time of the second electrical device to thereby ensure equal power at all times through the electrical devices to the load. The invention allows a number of parallel devices to act as a single switch.

ELECTRONIC SWITCH WITH AN INSULATING GATE OPERATED

SWITCHING CONFIGURATION FOR A POTENTIAL-SEPARATE CONTROL AT LEAST ONE FIELD-EFFECT TRANSISTOR

Pulse-width modulated circuit with improved linearity

COMPENSATED BASE DRIVE CIRCUIT TO REGULATE SATURATED TRANSISTOR CURRENT GAIN

CONDITION RESPONSIVE SOLID-STATE SWITCH

Pulse techniques are used to periodically monitor a desired environmental condition, such as pressure. A solid-state switch is connected between a power source and a load. In the off state of the switch, power from the source drives a timer circuit which supplies a short voltage pulse to a circuit for sensing the enviro nmental condition. At the same time, the pulse is supplied to associated circuitry for temperature compensation, amplification of the resulting sensing circuit signal, and a comparator circuit which determines whether or not a signal of the condition sen sed exceeds a predetermined threshold. If such signal exceeds the threshold, the sol id-state switch is turned on to connect the voltage source to the load. Turning on the switch results in substantially eliminating the voltage drop between the switch terminals, which previously was used to actuate the timer. Accordingly, a separa te timer circuit is provided to periodically open the closed power switch for again evaluating ...

POWER SWITCH WITH INRUSH CURRENT CONTROL

A power control circuit is provided for coupling a load to a power source. It includes a transistor for coupling said load to the power supply through the transistor dependent upon a control voltage applied to a control terminal of the transistor, a charge pump circuit having its output connected to the transistor control terminal to apply a controlled turn on signal to the transistor when the charge pump is activated, wherein the controlled signal gradually increases until the transistor is biased into its fully on state.

Circuit destiné à alimenter une bobine de self en réponse à un signal d'entrée

Dispositif d'alimentation d'une bobine de self avec un courant sensiblement constant

ARRANGEMENT WITH AT LEAST AN DELAY-AFFLICTED SEMICONDUCTOR SWITCH FOR THE VERKUERZUNG OF THE SWITCHING TIME.

ELECTRONIC SWITCHING MECHANISM WITH A POWER TRANSISTOR AS LOGIC ELEMENT.

Customer design analogue IC pulse driver

The pulse driver comprises two input transistors (Q1,Q2) whose emitter terminals are commonly connected via a resistor (R1) with a voltage source. The transistors are connected such that for two signals applied to input terminals, each being connected to the base terminal of the respective transistor, an AND operation for signals of the same polarity results. A third transistor (Q3) has its base terminal directly connected with the emitter terminals of the input transistors. Its collector terminal is connected directly with the voltage source.The base terminal of an output transistor (Q7) is connected via a fourth transistor (Q4), connected as a diode and a second resistor (R2) which is connected with the emitter terminal of the third transistor. The emitter terminal of the fourth transistor (Q4) is connected, via a leakage resistor (R3), directly to ground. The output transistor collector is connected via an external load resistor (RL) with the voltage source.

CONTROL CIRCUIT OF GRID Of a TRANSISTOR MOS OF POWER FUNCTIONING IN COMMUTATION

Circuit intégré de puissance "intelligent" du type MOS, pour la commande de l'alimentation d'une charge électrique.

Le circuit comprend un transistor de puissance (3) dont la grille est alimentée sélectivement par une pompe de charge (5). Il est caractérisé par une branche de contre-réaction (6, 7, 8) permettant de connecter la grille du transistor (3) à une source de tension (+Vb a t ), à la commande de mise en conduction du transistor (3). La source (+Vb a t ) charge alors rapidement la capacité de grille du transistor (3) en accélérant ainsi sa mise en conduction, cette source étant ensuite relayée par la pompe de charge pour le maintien de la conduction du transistor 3. Application à la commande d'un actionneur à charge inductive, par un circuit de puissance "intelligent" connecté au point "froid" de la charge.

Current pulse amplifier - has inversion transformer circuit connecting collector emitter path of control transistor with base of output power transformer

CIRCUIT DE POMPE DE CHARGE POUR COMMANDER DES TRANSISTORS MOS A CANAL N

CE CIRCUIT DE POMPE DE CHARGE COMPREND UN CONDENSATEUR 24 DONT UNE PREMIERE BORNE EST RACCORDEE A UN POINT DE TENSION DE REFERENCE 29 PAR L'INTERMEDIAIRE D'UN PREMIER ELEMENT INTERRUPTEUR 25 ET LA DEUXIEME BORNE A UNE SECTION DE COMMUTATION 20, 21. LA SECTION DE COMMUTATION, QUI EST MONTEE ENTRE UNE LIGNE DE TENSION D'ALIMENTATION POSITIVE ET LA TERRE, EST COMMANDEE DE FACON A RACCORDER ALTERNATIVEMENT ET SELECTIVEMENT LA DEUXIEME BORNE DU CONDENSATEUR A L'ALIMENTATION POSITIVE ET A LA TERRE. LA PREMIERE BORNE DU CONDENSATEUR EST EN OUTRE RACCORDEE A LA PORTE DU TRANSISTOR MOS 2 A COMMANDER. EN FONCTIONNEMENT, LA SECTION DE COMMUTATION EST COMMANDEE DE FACON A CHARGER LE CONDENSATEUR 24 ET A PERMETTRE ALTERNATIVEMENT LE TRANSFERT DE LA CHARGE DU CONDENSATEUR A LA PORTE DU TRANSISTOR MOS, D'OU IL RESULTE UNE CHARGE RAPIDE DU TRANSISTOR MOS ET UNE FAIBLE DISSIPATION DE CIRCUIT EN MODE DE FONCTIONNEMENT EN COURANT CONTINU.

CIRCUIT Of ATTACK FOR TRANSISTORS OF POWER BRANCHES IN PARALLEL

ELECTRONIC DEVICE OF ORDERING Of ACTUATORS

NETWORK OF COMPENSATION OF Basic DRIVE CURRENT

IMPROVEMENTS WITH THE ANALOGICAL DOORS

CIRCUIT OF PUMP OF LOAD TO ORDER TRANSISTORS MOS HAS CHANNEL NR

PROCESS AND APPARATUS FOR THE COMMUTATION COMMANDEE OF SEMICONDUCTORS OF POWER NOT COMPRISING POSITIVE REACTION

Circuits d'alimentation pour dispositifs inductifs

processo e dispositivo para a regulação de um estágio final de potência.

GATE DRIVER BOOTSTRAP CIRCUITS AND RELATED METHODS

Gate driver bootstrap circuits and related methods are described. An example gate driver stage (202) includes a first terminal (302) and a second terminal (304), the first terminal to be coupled to a capacitor (234), the capacitor and the second terminal to be coupled to a gate terminal (322) of a power transistor (120A), a gate driver (334) coupled to the first terminal and the second terminal, and a bootstrap circuit (232) coupled to the first terminal, the second terminal, and the gate driver, the bootstrap circuit including a control stage circuit having an output and a first transistor having a first gate terminal and a first current terminal, the first gate terminal coupled to the output, the first current terminal coupled to the first terminal.

TRANSIENT STABILIZED SOI FETS

Integrated circuits (ICs) that avoid or mitigate creation of changes in accumulated charge in a silicon-on-insulator (SOI) substrate, particularly an SOI substrate having a trap rich layer. In one embodiment, a FET is configured such that, in a standby mode, the FET is turned OFF while maintaining essentially the same VDS as during an active mode. In another embodiment, a FET is configured such that, in a standby mode, current flow through the FET is interrupted while maintaining essentially the same VGS as during the active mode. In another embodiment, a FET is configured such that, in a standby mode, the FET is switched into a very low current state (a "trickle current" state) that keeps both VGS and VDS close to their respective active mode operational voltages. Optionally, S-contacts may be formed in an IC substrate to create protected areas that encompass FETs that are sensitive to accumulated charge effects.

DRIVING A SWITCHING TRANSISTOR

In a driving circuit (2, 3) for a semiconductor switching element (1), a storage time (Ts) of the semiconductor switching element (1) is measured (2) to control the semiconductor switching element (1) such that the storage time (Ts) is kept substantially constant.

Gate control circuit for a switching power MOS transistor

A gate control circuit for a power MOS transistor (1), the first main electrode (D) of which is connected to a high voltage (VCC) through a load (L), the second main electrode (S) of which is grounded and the gate (G) of which is connected, during the switching ON period, to a low voltage source (VDD), comprises a switch (S1) for connecting at the switching ON of the power MOS transistor its first main electrode to its gate.

Interface control circuit with active circuit charge or discharge

An interface control circuit comprising a buffer, an inverter, an OR gate and delay means. The interface control circuit can be utilized in digital systems for communication handshaking such that a buffer output current will actively flow through line stray capacitance thereby greatly reducing the rise time from a LOW state to a HIGH state, or charges in the line stray capacitance will actively discharge through the buffer means if negative logic mode is used thereby enabling a great reduction in fall time, therefore a much faster and efficient digital system can be obtained through the use of the invention.

Control systems, methods, and software for keeping power converters within operating limits during disturbances

Feedback-type control systems for power converters that assist the power converters in staying within operational limited during disturbances. In some embodiments, each control system includes an impedance current regulator controlled as a function of an error between a measured feedback voltage signal representing the output of the power converter and an active feedforward voltage signal. In some multiphase embodiments, the impedance current regulator includes a gain that is adjusted as a function of the level of phase imbalance among the multiple phases. In some multiphase embodiments, a total current limit is determined as a function of the level of phase imbalance among the multiple phases. Corresponding feedback control methods and software, as well as power converter systems and AC network systems incorporating such feedback control systems, are also disclosed.

DRIVER FOR SWITCHING CIRCUIT AND DRIVE METHOD

A driver circuit includes monitoring circuitry (32, 34, 36) for monitoring the states of high and low side switches (6, 8). The driver circuit has an adjustable delay for turning on the transistors (6, 8). The delay is decreased when the monitoring circuit detects that a voltage corresponding to one transistor passes a predetermined voltage V1 before a voltage corresponding to the other transistor passes another predetermined point V2, and vice versa.

Circuit arrangement

Коммутатор

Двунаправленный аналоговый ключ

Изобретение относится к коммутационной технике и может быть использовано в устройствах автоматики в качестве быстродействующего реле. Целью изобретения является повьшение быстродействия при малых сопротивлениях ffкоммутируемой цепи. Для достижения поставленной цели в устройство, содержащее операционный усилитель 1, два полевых транзистора 2 и 3, первый управляемый источник тока 4, дополнительно введен второй управляемый источник тока 5, выполненный идентично с первым на основе операционного усилителя 14 и четырех резисторов 15- 18. Благодаря симметричному включению обоих управляемых источников тока по отношению к контактам ключа за счет стабилизации глубины.обратной связи и устрш-гения влияния на гранич- , ную частоту переключения различия величин сопротивления коммутируемых § цепей устройство работает как обычное реле с высоким быстродействием, независимо от величины сопротивления нагрузки. 4 00 00 ...

Трехфазный тиристорный выключатель

Изобретение относится к электротехнике и может быть использовано в автоматических выключателях трехфазt .r кого переменного тока для сетей с изолированной нейтралью. Цель изобретения - повьппение надежности выключения . Для этого в устройство введены вспомогательные силовые тиристоры 7, 8,9 в ключи, связанные с помощью диодов 10 - 15 с коммутирующим конденсатором 17, что позволяет обеспечить неизбирательную принудительную коммутацию , при которой управление систе-. мой коммутации не зависит от полярностей фазных токов нагрузки. Устройство содержит в каждой фазе А,В,С ключ, образованный двумя встречно-параллельно включенными основными силовыми тиристорами 1 - 6. Общие точки подключения всех диодов соединены между собой через последовательно включенные конденсатор 17, заряженный в предкоммутационный период, и коммутирующий тиристор 16. 1 ил. to taeA. «чЭ О ...

Устройство для регулирования напряжения топливной батареи

Импульсный ключ с запоминанием сигнала управления

Изобретение относится к импульсной технике. Может быть иснользовано в системах вычислительной техники, автоматике, в измерительных нриборах и микроэлектронике . Цель изобретения - расширение функциональных возможностей. Устройство содержит элементы И-НЕ 2-5, выход 1, вход 6 ком.мутации, первый вход 7 управления , второй вход 8 управления. Для достижения поставленной цели элементы И-НЕ 2, 3 имеют третьи входы, которые объединены и образуют второй вход 8 управления, второй вход элемента И-НЕ 5 подключен к выходу элемента И-НЕ 4, выход элемента И-НЕ 3 соединен с выходом 1 устройства. 2 ил. со го го СП 05 Фиг.

Быстродействующий ключ

Verringerung der Ausschaltszeit eines Ausgangsleistungstransistors

Schaltreglertreiberschaltung mit hoher Schaltgeschwindigkeit

Steuerungsschaltung mit integrierter Schaltung mit vorgegebener Zündverzögerung für MOS-Leistungstransistoren.

Solid-state pulse generator

Turn-off control for a bipolar transistor

To reduce turn-off time in a bipolar transistor the base drive current is controlled to avoid excess stored charge at the desired instant of turn-off. The base current drive waveform may be adjusted in dependence on collector voltage so that the transistor remains in saturation or quasi-saturation at the end of the collector current conduction period. The width or slope (figure 21) of the base current pulse in a conduction cycle may be varied in dependence on the collector voltage in a previous cycle so that the transistor's collector-emitter voltage is low during the earlier part of the pulse but with base charge at the instant of turn-off being just sufficient to support the collector current. The desaturation time may be measured by sensing edges in the collector voltage or the reverse base current, and it may be controlled by adjusting the base drive (figures 34-36). The technique may be applied to IGBTs or BJTs.

Circuit arrangement having an output transistor for the switching-on and switching-off of a load

A switching transistor (5) has its collector connected to a common junction (J) with a load (6), typically an ignition coil (8). A first driver transistor (11) connected through the base-emitter path of a second driver transistor (12) to control the conduction state of the switching transistor. A signal source (20, 21) alternatingly, causing the driver transistor to be blocked or conductive. To decrease the power requirements on the driver transistor, the driver transistor has its collector connected to the common junction (J) the voltage at line (13) of the driver and of the junction being arranged that the voltage at the junction (J) is less than the voltage at the base of the driver transistor when the switching transistor (5) is in fully saturated conductive condition, re-combination of charge carriers on the base of the switching transistor maintaining the switching transistor conductive until the charge carriers are exhausted, which causes a slight rise in voltage at the junction ...

SWITCHING SEMICONDUCTOR DEVICES

Switching circuits

A monolithically integratable control circuit for switching inductive loads, comprising a Darlington-type final stage, is described. The base of the Darlington control transistor is coupled to the collector of a transistor for extracting charge, the transistor conducting in phase opposition to the Darlington control transistor. The emitter of the transistor for extracting charge is coupled to the negative supply terminal and to the output terminal of the final stage, via a first and a second diode respectively.

DRIVING CIRCUIT FOR SWITCHING MECHANISM AND HEADING FOR PROCEDURE FOR IT

SWITCH WITH A WHEN SOURCE FOLLOWER CLAIMANT MIS-FET.

SWITCHING CONFIGURATION FOR THE PRODUCTION OF BIAS-REDUCING POTENTIALS

SWITCHING CONFIGURATION FOR A POTENTIAL-SEPARATE CONTROL AT LEAST ONE FIELD-EFFECT TRANSISTOR

METHOD AND DEVICE FOR CONTROLLING A POWER OUTPUT STAGE

... ▓▓▓The invention relates to a power output stage (T) which is charged with a high ▓charging current (Ig1) in order to effect an electromagnetic interference-▓compatible control. The power output stage is charged until the drain current ▓(Id) exceeds a current threshold value (Is), is subsequently charged with a ▓lower charging current (Ig2), said lower charging current being associated ▓with the desired slew rate, until the drain voltage (Vd) falls below a ▓predetermined voltage threshold value (Vs), and, afterwards, is subjected to a ▓continual charging with the high charging current(Ig1) for a predetermined ▓duration (Tv). To effect a closing control, the operation is carried out in an ▓almost reversed sequence.▓ ...

DRIVE CIRCUIT FOR PARALLEL NON-MATCHED SEMICONDUCTORS

ELECTRONIC SWITCHING APPARATUS

In an electronic switching apparatus comprising a power transistor (1) controlled by a control stage as the switching element, a switch-off relief circuit containing a series circuit of a condenser (11) and a diode (10) poled in the same sense as the power transistor (1), and a discharge path which by-passes the collectoremitter path of the power transistor (1) and comprises a discharge resistor (12) for the condenser (11) and a discharge transistor (2; 13) operated simultaneously with the power transistor (1), the series circuit of the condenser (11) and diode (10) being in parallel with the collector-emitter path of the power transistor (1), the discharge current of the condenser (11) is led through the base-emitter path of the power transistor (1) to reduce the losses of the switching apparatus.

CIRCUIT FOR REGULATIONG THE BASE CURRENT OF A SEMICONDUCTOR POWER DEVICE

CONTROL DEVICE Of a COMMUTATEUR/INTERRUPTEUR HAS GRID ISOLEE, OF FORTCOURANT, VERY STRONG CURRENT, AND COMMUTATEUR/INTERRUPTEUR Of IMPULSES

POWER SUPPLY

Amplifying device in two outputs

Device for fast control of insulated-gate switch/interrupter for high and very high current pulses, comprises means for switching control on account of energy in load circuit

La présente invention concerne un dispositif de commande d'un commutateur/ interrupteur d'impulsions (2) à grille (s) isolée (s) de fort et très fort courant dans un circuit de charge (6). Selon l'invention, le dispositif comporte des moyens de mise en conduction (36) avec un circuit de commande pour prélever du circuit de charge (6), l'énergie électrique de mise en conduction du commutateur/ interrupteur (2) à l'aide de moyens écrêteurs (43). Applications à la réalisation de commutateurs/ interrupteurs, convertisseurs d'énergie électrique, à haute et très haute tension, aux alimentations électriques asymétriques et symétriques. Fabrication de composants électroniques. Applications utilisant la technique matricielle high-busbar.

GATE CONTROL CIRCUIT OF A POWER MOS TRANSISTOR OPERATING IN SWITCHING

ORDER Of a TRANSISTOR MOS

Un procédé de commande d'un transistor ayant un mode de fonctionnement linéaire, un mode de fonctionnement en interrupteur fermé et un mode de fonctionnement bloqué comprend une première phase de fonctionnement au cours de laquelle un courant circule d'une borne source vers une borne drain et une seconde phase de fonctionnement au cours de laquelle aucun courant ne circule. Le procédé comprend les étapes suivant lesquelles, successivement : (a) on commande le transistor en mode interrupteur fermé pendant une partie de la première phase ; (b) on commande le transistor en mode linéaire ; (c) on commande le transistor en mode bloqué pendant une partie de la seconde phase.

CONTROL CIRCUIT AND CONTROL METHOD FOR TURNING ON POWER SEMICONDUCTOR SWITCH

A control circuit for turning on a power semiconductor switch includes: an input formed to receive a signal characterizing a switch-on behavior of the power semiconductor switch; and a variable current source formed to supply a current having a variable level by the control input of the power semiconductor switch in order to switch on the power semiconductor switch. The control circuit is formed to control the variable current source by a closed control loop in response to the signal characterizing the switch-on behavior of the power semiconductor switch. COPYRIGHT KIPO 2016 (302) State circuit (304) Peak timing detection circuit ...

TRANSISTORDRIVKRETS

LADDNINGSPUMPKRETS FOER DRIVNING AV MOS-TRANSISTORER MED N-KANAL

SWITCH CONTROL PANEL

The invention relates to a switch control panel, particularly for a motor vehicle, comprising an actuating surface (2) for manual operation by means of an element (3), the element (3) in particular being the finger of a human hand. The switch control panel comprises a sensor (4) that interacts with the actuating surface (2) such that the sensor (4) generates a signal when the element (3) approaches the actuating surface (2), and/or when the element (3) touches the actuating surface (2), and/or when the element (3) exerts pressure onto the actuating surface (2), said signal being used to switch and/or trigger a function in the manner of a switching signal. The sensor (4) is a sensor that operates with optical electromagnetic radiation (5). The optical sensor (4) interacts with a lens (6) such that the radiation (5') emitted by the sensor (6) and/or the radiation (5") received by the sensor (6) is aligned, particularly focussed, onto and/or by the element (3).

ELECTRONIC DEVICE FOR CONTROLLING ACTUATORS

The invention relates to a device (1) for controlling inductive charges (11, 112) comprising several control stages (321, 322) which are provided with the bond pad (331, 332) for an inductive charge (321, 322), an input (301, 302) for receiving a contact activating signal, a switch (121, 122) comprising control and output electrodes, an enabling circuit (181, 182) for measuring the voltage applied to the bond pad (331, 332) and generating an enable signal, a conductivity restoring circuit (2) which is common for the control stages and limits the plot voltage of different stages at a common level and applying the contact activating signal to the control electrode of a switch when the enable signal is generated. Said invention makes it possible to ensure an identical supply time to the charges connected to the bond pad.

OPTICALLY COUPLED CIRCUIT ARRANGEMENT

Optocoupler for power FET

A power FET is driven by a photodiode chain across a switch, which has two FETs (5, 6) arranged in series. Upon illumination the first FET (5) is driven to be conducting, which permits current to flow from a capacitor (C) connected to a fixed voltage into the gate-source capacitor (CGS) of the power FET (1) and to switch it on rapidly. Upon cessation of the illumination, the first FET (5) is blocked while the second FET (6) is driven to be conducting. Hence, the CGS of the power FET is discharged and the power FET is blocked.

Output circuit and operational amplifier

An output circuit comprises first and second transistors, a driving circuit and a current mirror circuit. The driving circuit supplies a relatively small constant current to the base of the first transistor. When a current flows to the collector of the first transistor, a current with a magnitude set at a fixed ratio with respect to the current flows to the collector of the second transistor, and a current proportional to the current flowing to the collector of the second transistor flows to the base of the first transistor by way of the current mirror circuit. That is, a current, which is determined in accordance with a current flowing to the collector of the first transistor, flows to the base of the first transistor.

Charge pump circuit for driving N-channel MOS transistors

This charge pump circuit comprises a capacitor connected with a first terminal thereof to a reference voltage point through a first switch element and with a second terminal thereof to a switching section. The switching section, which is arranged between a positive supply voltage line and the ground, is controlled so as to alternately and selectively connect the second terminal of the capacitor to the positive supply and to ground. The first terminal of the capacitor is further connected to the gate of the MOS transistor to be driven. During operation the switch section is controlled so as to alternately charge the capacitor and allow transfer of the charge of the capacitor to the MOS transistor gate, thereby achieving a fast charging of the MOS transistor and a low circuit dissipation in the DC mode.

Current sensing gated current source for delay reduction in a universal serial bus (USB) low speed output driver

A circuit comprising a comparator circuit and a control circuit. The comparator circuit may be configured to present an output signal in response to (i) a reference current and (ii) a control current. The control circuit may be configured to generate the control current in response to (i) a first current source configured to present a fixed portion of the control current, (ii) a second current source configured to present a variable portion of the control current and (iii) a sense transistor. The second current source generally responds to a level of said control current.

Frequency compensation circuit for stabilizing a differential amplifier with cross-coupled transistors

A differential amplifier comprises a Darlington differential pair (T1/T3, T2/T4) and a cross-coupled transistor pair (T5, T6) to increase the transconductance of the Darlington differential pair (T1/T3, T2/T4). The negative input impedance of the differential amplifier as a result of the presence of the cross-coupled differential pair (T5, T6) is compensated for at high frequencies and the gain of the differential amplifier is reduced by a compensation circuit with a capacitor (30) between the control electrodes of the transistors of the cross-coupled differential pair (T5, T6) and with resistors (26, 28) in series with the control electrodes of the transistors of the cross-coupled differential pair (T5, T6).

Load-generated drive, substantially no quiescent current, techniques and circuits for high speed switching of transistors

Techniques and circuits for high speed switching of transistors are provided. These techniques and circuits switch an output device while varying the drive current to the output device in proportion to the output current through the output device. In addition, these techniques and circuits provide a switching circuit with substantially no quiescent currents. This is accomplished by sampling the output current conducted by the output device and using the sample as a signal to drive either the output device fully ON or to switch the output device fully OFF.

SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE AND ELECTRONIC DEVICE FOR DRIVING A POWER SEMICONDUCTOR DEVICE

Adjustment of drive control based on a detection voltage of a transformer requires a loop time, and therefore high-speed processing of the adjustment is difficult. A semiconductor integrated circuit device includes a driving circuit that drives a power semiconductor device and a driving capability control circuit that controls a driving capability of the driving circuit. The driving circuit stops driving of the power semiconductor device based on an abnormal current detected from a sense current of the power semiconductor device. The driving capability control circuit controls the driving capability of the driving circuit based on a normal current detected from the sense current of the power semiconductor device.

Input buffer

The trend in wireless communication receivers is to capture more and more bandwidth to support higher throughput, and to directly sample the radio frequency (RF) signal to enable re-configurability and lower cost. Other applications like instrumentation also demand the ability to digitize wide bandwidth RF signals. These applications benefit from input circuitry which can perform well with high speed, wide bandwidth RF signals. An input buffer and bootstrapped switch are designed to service such applications, and can be implemented in 28 nm complementary metal-oxide (CMOS) technology.

OPERATING ELECTRONIC SWITCHES HAVING AN INSULATED GATE

ARRANGEMENT FOR A PHOTODETECTOR CIRCUIT FOR LOW POWER APPLICATIONS, AND A CORRESPONDING METHOD AND A COMPUTER PROGRAM PRODUCT

The present invention introduces an arrangement for enhancing the performance of an electronic circuit comprising a phototransistor (Q). Either a common-collector or a common-emitter connected phototransistor (Q) has a main resistor (RL), and at least one external bias resistors (RL2, RL3, RL4), each in parallel to one another. The microcontroller may directly control the voltage outputs or act via respective switches (S1, S2) regarding each respective resistor. When the electronic circuit with the phototransistor (Q) is switched on, at least one of the external bias resistors (RL2, RL3, RL4) are switched on. The voltage output rise time is short, and when the bias has been set, the external bias resistor(s) are disconnected functionally. This means that during the actual measurement with the electric circuit, only the main resistor (RL) is used in the connection.

SYSTEMS AND METHODS FOR PULSE WIDTH MODULATED CONTROL OF A SEMICONDUCTOR SWITCH

POWER TRANSISTOR DRIVE CIRCUIT WHOSE BASE CURRENT IS ITS PRESCRIBED FUNCTION OF COLLECTOR

PURPOSE: To adjust a base current so that it is a function of collector current by generating a drive base current that is proportional to the current of a voltage function of a detection resistor. CONSTITUTION: A detection resistor R1 is inserted between an emitter of a power transistor T1 and a ground, generates a 1st current I2 which passes through the resistor R1, and is a function of voltage and also constitutes a drive circuit, together with a circuit that generates drive base current Ib of the transistor T1 which is proportional to the current I2. Thus, the current Ib that is proportional to the current which depends on a collector current and a gain of the transistor T1 can be supplied to the transistor T1. Although it changes as a function of the collector current itself by the circuit, the base current is decided as both the functions of the collector current and a connection temperature with the gain of the Tr T1 taken into consideration. COPYRIGHT: (C)1994,JPO ...

Многоканальный коммутатор

Изобретение относится к автоматике и телемеханике и применимо для коммутации цифровой информации при двунаправленном обмене. Цель изобре- тения - повышение быстродействия коммутатора - достигается за счет исключения циклического опроса линий связи. При поступлении информации по любой линии 1.1-1.3 связи сигнал через соответствующие приемопередатчик 2.1- 2.3 и элемент И 3.1-3.3 переключает триггер 5.1-5.3. Сигнал с последнего поступает в блок 6 обмена информации и закрьшает остальные линии связи. Обмен информацией в выбранной линии связи продолжается до появления сигнала на: втором выходе 8 блока 6 обмена , после чего многоканальный комму- S татор устанавливается в исходное состояние . 1 ил. (Л ...

Распределитель импульсов

Формирователь прямоугольных световых импульсов

Изобретение относится к импульсной технике и может быть использовано в качестве передатчика световых сигналов через волоконно-оптическую линию связи. Цель изобретения - повышение быстродействия за счет увеличения крутизны фронтов. При появлении на прямом выходе формирователя 4 парафазных сигналов сигнал логического нуля светодиода 1 складывается из тока коллектора транзистора 2 и втекающего тока прямого выхода формирователя 4. При этом форсированная величина тока светодиода 1 обусловлена зарядным током конденсаторов 10,11. При переключении формирователя 4 закрывается транзистор 2, а открытый транзистор 3 шунтирует переход светодиода 1, обеспечивая высокую крутизну среза светового импульса. Увеличение крутизны фронта и среза формируемого светового импульса осуществляется без увеличения потребления тока в статическом режиме. 1 ил.

Адаптивное коммутирующее устройство

АМПТИВНОЕ КОММУТИРУЮЩЕЕ УСТРОЙСТВО, содержащее блок кгаочей, два элемента ИЛИ, входы первого из которых соединены с входами устройства, формирователь, перестраивав- мый распределитель и кодер, выход которого соединен с информационным входом регистра, отличающееся тем, что, с целью расширения функциональных возможностей и повышения быст родействия, в него введены триггеры по числу входов и блок регистров с числом регистров, равным числу входов устройства , блок задержки с числю элементов, превышающим число входов устройства на один, блок компараторов с числом элементов, менышм числа входов устройства на один, и формирователь сигналов сдвига, причем входы устройства соединены с первыми входами перестраиваемого распределителя, с входами кодера и блока задержки, выходы которся о подключены к первым входам блска ключей, второй вход, управляющий вход, первый и BTOpt выходы которого соединены соответственно с выходами первого и вт{ рог о элементов ИЛИ, с входами триггере , управлякнцие входы которых ...

Verfahren und Vorrichtung zum Ansteuern einer Leistungsendstufe

The invention relates to a power output stage (T) which is charged with a high charging current (Ig1) in order to effect an electromagnetic interference-compatible control. The power output stage is charged until the drain current (Id) exceeds a current threshold value (Is), is subsequently charged with a lower charging current (Ig2), said lower charging current being associated with the desired slew rate, until the drain voltage (Vd) falls below a predetermined voltage threshold value (Vs), and, afterwards, is subjected to a continual charging with the high charging current(Ig1) for a predetermined duration (Tv). To effect a closing control, the operation is carried out in an almost reversed sequence.

Verfahren und Schaltungsanordnung zur Ansteuerung von Ventilspulen in elektronischen Kraftfahrzeugbremssystemen

Verfahren zur Ansteuerung einer Endstufe, welche insbesondere eine PWM-geregelte Endstufe ist, in einem elektronischen Kraftfahrzeugsteuergerät umfassend - eine elektronische Ausgangsendstufe (1, 3) zur Ansteuerung von induktiven Lasten (4) und - eine elektrisch ansteuerbare Abschaltstufe (2, 6, 14) mit einem elektrisch ansteuerbaren Abschaltbauelement (2) zum schnelleren Einstellen eines vorgegebenen Sollstroms (Iref), welches in Reihenschaltung zum Ausgang der Ausgangsendstufe angeordnet ist, dadurch gekennzeichnet, dass der ohmsche Widerstand des Abschaltbauelementes in Abhängigkeit vom aktuellen Strom und in Abhängigkeit vom aktuellen Sollstrom eingestellt wird.

Драйвер силового модуля

Предложение относится к области силовой электроники, в частности к формирователям импульсов управления ключевыми компонентами силовых схем, и может быть использовано при проектировании силовых модулей, в том числе интеллектуальных. Технический результат предлагаемого устройства заключается в том, что устройство питается от однополярного источника постоянного напряжения, формируя при этом двухполярный сигнал управления, устройство защищено от сквозных токов между транзисторами блока усиления мощности сигнала управления, устройство обладает возможностью изменения зарядного и разрядного тока в выходной цепи импульса управления. Технический результат достигается тем, что блок усиления мощности выходного сигнала управления выполнен по схеме моста, нижние плечи которого представляют собой ключи, присоединенные к общей шине питания, верхние плечи моста образованы последовательным соединением резисторов ограничения тока и ключей, присоединенных к положительной шине питания, при этом диагональ моста образует выходную цепь драйвера силового модуля. 3 ил. РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 185 902 U1 (51) МПК H02M 1/08 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ПОЛЕЗНОЙ МОДЕЛИ К ПАТЕНТУ (52) СПК H02M 1/08 (2018.08); H02H 9/00 (2018.08) (21)(22) Заявка: 2018135987, 11.10.2018 (24) Дата начала отсчета срока действия патента: Дата регистрации: 24.12.2018 (45) Опубликовано: 24.12.2018 Бюл. № 36 Адрес для переписки: 109052, Москва, ул. Смирновская, 4, стр. 2, ПАО "НПО "ЭНЕРГОМОДУЛЬ", генеральному директору Т.И. Мартыновой (73) Патентообладатель(и): Российская Федерация, от имени которой выступает Министерство промышленности и торговли Российской Федерации (RU), Публичное акционерное общество "Научно-производственное объединение "ЭНЕРГОМОДУЛЬ" (RU) (56) Список документов, цитированных в отчете о поиске: RU 2641661 C2, 19.01.2018. RU U 1 1 8 5 9 0 2 R U (54) ДРАЙВЕР СИЛОВОГО МОДУЛЯ (57) Реферат: Предложение относится к области силовой электроники ...

III-Nitride Power Converter Circuit

An integrated circuit that includes a power stage and a driver stage, all stages using III-nitride power devices.

Anovel Protection Method Of Direct Currrent Converter Valve Thyristor In Discontinuous Current Mode

The present provided a novel protection method of direct current converter valve thyristor in discontinuous current mode. In normal operation, the thyristor of converter valve will be triggered normally when thyristor anode and cathode voltage is positive, and thyristor electronics (TE) send pulse. If the discontinuous current happens, the current will over zero and the thyristor will cut off. After that if the forward voltage appears again, the voltage will be too great, more than the thyristor voltage capability. If the thyristor is not triggered immediately, the thyristor will be damaged probably. To ensure converter valve work normally in discontinuous current mode of the direct current transmission system, TE design has automatic re-trigger function to protect thyristor in discontinuous current mode; in triggering interval when forward voltage is up to +100V the thyristor will be re-triggered to ensure thyristor and system work safely and reliably.

Semiconductor device including a circuit to compensate for parasitic inductance

A semiconductor device includes a first transistor, a second transistor coupled in parallel with the first transistor, and a first parasitic inductance between an emitter of the first transistor and an emitter of the second transistor. The semiconductor device includes a first circuit configured to provide a first gate driver signal to the first transistor based on a common driver signal and a second circuit configured to provide a second gate driver signal to the second transistor based on the common driver signal. The first circuit and the second circuit are configured to compensate for a voltage drop across the first parasitic inductance such that the first gate driver signal and the second gate driver signal are in phase with and at the same magnitude as the common driver signal.

Cascode switches including normally-off and normally-on devices and circuits comprising the switches

Switches comprising a normally-off semiconductor device and a normally-on semiconductor device in cascode arrangement are described. The switches include a capacitor connected between the gate of the normally-on device and the source of the normally-off device. The switches may also include a zener diode connected in parallel with the capacitor between the gate of the normally-on device and the source of the normally-off device. The switches may also include a pair of zener diodes in series opposing arrangement between the gate and source of the normally-off device. Switches comprising multiple normally-on and/or multiple normally-off devices are also described. The normally-on device can be a JFET such as a SiC JFET. The normally-off device can be a MOSFET such as a Si MOSFET. The normally-on device can be a high voltage device and the normally-off device can be a low voltage device. Circuits comprising the switches are also described.

INVERTER APPARATUS HAVING POWER SUPPLY CIRCUIT

An inverter apparatus having a power supply circuit includes a converter circuit for rectifying AC power into DC power, a smoothening circuit for smoothening the rectified DC power, an inverter circuit for converting the smoothened DC into AC at a variable frequency through a plurality of switches to control a load, and a current detection circuit for detecting overcurrent from the smoothened DC supplied from the inverter circuit, wherein the inverter circuit applies bootstrap power for driving the switches to the current detection circuit to use the bootstrap power as power of the current detection circuit. When bootstrap power for driving switch gates is used, it is possible to use the bootstrap power as the power of the current detection circuit by adding the auxiliary circuit composed of a small number of passive elements. 1. An inverter apparatus comprising:a converter circuit for rectifying AC power into DC power;a smoothening circuit for smoothening the rectified DC power;an inverter circuit for converting the smoothened DC into AC at a variable frequency through a plurality of switches to control a load; anda current detection circuit for detecting overcurrent from the smoothened DC supplied from the inverter circuit, wherein the inverter circuit applies bootstrap power for driving the switches to the current detection circuit to use the bootstrap power as power of the current detection circuit.2. An inverter apparatus of claim 1 , wherein the inverter circuit comprises:a switching circuit using the bootstrap power as power for turning on gates of the switches; andan auxiliary circuit for applying the bootstrap power from the switching circuit to the current detection circuit.3. The inverter apparatus of claim 2 , wherein the auxiliary circuit includes a diode and a resistor serially connected to the switching circuit claim 2 , and a capacitor connected in parallel with the serially connected diode and resistor.4. The inverter apparatus of claim 1 , wherein ...

SAMPLING CIRCUIT FOR MEASURING THE REFLECTED VOLTAGE OF TRANSFORMER FOR POWER CONVERTER

A sampling circuit of the power converter according to the present invention comprises an amplifier circuit receiving a reflected voltage for generating a first signal. A first switch and a first capacitor are utilized to generate a second signal in response to the reflected voltage. A sample-signal circuit generates a sample signal in response to a falling edge of a switching signal. The switching signal is generated in accordance with a feedback signal for regulating an output of the power converter. The feedback signal is generated in accordance with the second signal. The sample signal is utilized to control the first switch for sampling the reflected voltage. The sample signal is disabled once the first signal is lower than the second signal. The sampling circuit precisely samples the reflected voltage of the transformer of the power converter for regulating the output of the power converter. 1. A sampling circuit for sampling a reflected voltage of a transformer for the power converter , comprising:an amplifier circuit coupled to receive the reflected voltage for generating a first signal;a first capacitor generating a second signal in response to the reflected voltage;a first switch coupled between the reflected voltage and the first capacitor; anda sample-signal circuit generating a sample signal in response to a falling edge of a switching signal, in which the switching signal is generated in accordance with a feedback signal for regulating an output of the power converter;wherein the feedback signal is generated in accordance with the second signal;the sample signal is utilized to control the first switch for sampling the reflected voltage; the sample signal is disabled once the first signal is lower than the second signal; the second signal comparing with the first signal has a propagation delay.2. The circuit as claimed in claim 1 , further comprising a resistive device coupled to the first switch; in which the resistive device and the first capacitor ...

HIGH FREQUENCY SWITCH CIRCUIT

A high frequency switch circuit including: a first rectifier circuit including at least one rectifier element having one end connected between the gate terminal of a first MOSFET circuit and a first control terminal and the other end connected to ground, and a second rectifier circuit including at least one rectifier element having one end connected between the gate terminal of a second MOSFET circuit and a second control terminal and the other end connected to ground. The circuit further includes a connecting section connecting the forward-current input terminal side of at least one of the rectifier elements of the first rectifier circuit and one of the main terminal sides of the first MOSFET circuit, and connecting the forward-current input terminal side of at least one of the rectifier elements of the second rectifier circuit and one of the main terminal sides of the second MOSFET circuit. 1. A high frequency switch circuit that makes use of a first control voltage applied to a first control terminal for controlling the connection between a common signal terminal and a first signal terminal and/or a second control voltage applied to a second control terminal for controlling the connection between the common signal terminal and a second signal terminal , whereby to selectively switch the connection of the common signal terminal to either the first signal terminal or the second signal terminal , the high frequency switch circuit comprising:a first signal section including a first MOSFET circuit one of whose main terminals is connected to the common signal terminal, the other of whose main terminals is connected to the first signal terminal and whose gate terminal is connected to the first control terminal, and a first rectifier circuit including at least one rectifier element one of whose ends is connected between the gate terminal of the first MOSFET circuit and the first control terminal and the other of whose ends is connected to ground, whereby the direction ...

POWER SUPPLY CONTROL METHOD FOR CONSTANT CURRENT CONSTANT POWER CONTROL

A digital power supply and power supply controller are presented, including a voltage control loop and a current control loop, with a controller for pulse width modulating a switching power supply according to a voltage control loop duty cycle output or a current control loop duty cycle output, in which the controller selectively presets the voltage control loop duty cycle output to a predetermined value before switching from current loop control to voltage loop control and/or inhibits increase in a voltage loop integrator value during current loop control to mitigate voltage overshoot. 1. A power supply controller for controlling a switching power supply , comprising: a voltage error circuit providing a voltage error signal or value based at least partially on a reference voltage signal or value and an output voltage of the switching power supply, and', 'a voltage compensator circuit providing a voltage control duty cycle signal or value based at least partially on the voltage error signal or value;, 'a voltage control circuit, including a current error circuit providing a current error signal or value based at least partially on a reference current signal or value and an output current of the switching power supply, and', 'a current compensator circuit providing a current control duty cycle signal or value based at least partially on the current error signal or value;, 'a current control circuit, includinga pulse width modulation circuit operative to pulse width modulate at least one switch of the switching power supply at least partially according to a duty cycle input signal or value; and switch the control circuit from the first mode to the second mode if a sum of the voltage control duty cycle signal or value plus a predetermined non-zero hysteresis value is greater than the current control duty cycle signal or value, and', 'selectively preset the voltage control duty cycle signal or value to a predetermined duty cycle signal or value and then switch the ...

System and Method for Driving a Switch

In accordance with an embodiment, a circuit for driving a switch includes a driver circuit. The driver circuit includes a first output configured to be coupled to a gate of the JFET, a second output configured to be coupled to a gate of the MOSFET, a first power supply node, and a bias input configured to be coupled to the common node. The switch to be driven includes a JFET coupled to a MOSFET at a common node. 1. A circuit for driving a switch , the switch comprising a normally-on device coupled to a switch transistor at a common node , the circuit comprising: a first output configured to be coupled to a control node of the normally-on device,', 'a second output configured to be coupled to a control node of the switch transistor,', 'a first power supply node, and', 'a bias input configured to be coupled to the common node, wherein the driver circuit is configured to receive power from the bias input during startup of the circuit., 'a driver circuit comprising'}2. The circuit of claim 1 , wherein the driver circuit is configured to operate with:a capacitor coupled between the first power supply node and a first output of the normally-on device; anda first network coupled between the first power supply node and a second output of the normally-on device, wherein the first network comprises a diode and a second capacitor coupled in series.3. The circuit of claim 1 , wherein:the driver circuit is configured to keep the switch transistor off when a reference supply voltage is below a first threshold voltage;the driver circuit is configured to operate the switch transistor and the normally-on device together when the reference supply voltage is between the first threshold voltage and a second threshold voltage; andthe driver circuit is configured to keep the switch transistor on when the reference supply voltage is greater than the second threshold voltage.4. The circuit of claim 3 , wherein the reference supply voltage is proportional to a voltage of an internal power ...

MULTIPHASE LOW LC BUCK REGULATOR

A buck power converter creates a desired output voltage from a greater input voltage with higher efficiency than linear regulators or charge pumps. For compact-size and cost sensitive products, the use of the buck power converter is hindered mainly because of lack of physical space and increases in the cost of the passive components like the inductor and capacitor. Techniques are presented to reduce the sizes of the passive components so that they can be integrated on-chip or in-package or on board. A signal converter in the buck power converter determines the duty cycle of a switching control signal. The switching control signal would ordinarily have driven a power switching circuit that provides current to the inductor in the buck power converter. The signal converter outputs a modified (multiphase) switching control signal that includes multiple separated on-periods that taken together approximate the duty cycle of the switching control signal while maintaining the same control loop frequency. The multiphase switching signal drives the power switching circuit to provide current to the inductor during each of the multiple separated on-periods so that the output voltage ripple decreases by a factor of the number of phases in the modified switching signal. In this way, if the ripple amplitude is kept same, the sizes of the passive components can be reduced by the factor of the number of phases in the modified switching control signal. 1. A switching power converter comprising:a control unit operable to output a switching control signal characterized by a duty cycle; determine the duty cycle; and', 'output a modified switching signal comprising multiple separated on-periods that taken together approximate the duty cycle;, 'a signal converter in communication with the switching control signal and operable toa power switching circuit in communication with the modified switching signal;an inductor connected to the power switching circuit such that the power switching ...

NOISE RESISTANT REGULATOR

A converter for supplying a regulated voltage from an input to a load is disclosed. The converter supplies a regulated DC voltage from an input to a load using a power switch driven by a gate driver. It also includes a control loop for carrying a load condition signal and a control signal. The converter also includes a controller located on the control loop that generates the control signal based on the load signal. The controller is located on a first integrated circuit. The gate driver is located on a second integrated circuit. The load condition signal is encoded on the first integrated circuit and is decoded on the second integrated circuit. 1. A noise resistant DC to DC converter comprising:a power switch used to supply a regulated DC voltage to a load, the power switch driven by a gate driver;a control loop carrying a load condition signal and a control signal; anda controller located on the control loop that generates the control signal based on the load condition signal; the controller is located on a first integrated circuit;', 'the gate driver is located on a second integrated circuit; and', 'the load condition signal is encoded on the second integrated circuit, and is decoded on the first integrated circuit., 'wherein2. The noise resistant DC to DC converter of claim 1 , wherein the load condition signal is encoded using a differential encoding.3. The noise resistant DC to DC converter of claim 2 , wherein the differential encoding is an LVDS encoding.4. The noise resistant DC to DC converter of claim 1 , further comprising:an analog to digital converter located on the second integrated circuit;an encoder located on the first integrated circuit, the encoder encoding the control signal and embedding a synchronization signal in the control signal; anda decoder located on the second integrated circuit, the decoder decoding the control signal and providing the synchronization signal to the analog to digital converter.5. The noise resistant DC to DC converter ...

DIGITALLY CONTROLLED HIGH SPEED HIGH VOLTAGE GATE DRIVER CIRCUIT

The present invention relates to semiconductor technology. In particular, the present invention relates to high-speed, high voltage switching for a high voltage generator for an X-ray system. Switching elements, e.g. IGBTs or MOS-FETs, are employed for high-speed high voltage switching. However, circuit elements or parasitic elements at an input of the switching element limit the switching speed of the switching element. The present invention proposes applying a higher than allowed voltage to the input of the switching element, e.g. a voltage higher than the maximum allowed gate voltage of an IGBT or MOS-FET, to increase switching speed. A feedback loop is provided for save operation. thus, a switching circuit () for high speed switching is provided, comprising an amplifier circuit (), comprising an output () being adapted to be connectable to an input () of a switching arrangement (), wherein the voltage provided by the output () exceeds a maximum gate voltage, wherein the amplifier circuit () is controllable so that a current internal gate voltage does not to exceed the maximum internal gate voltage. 12. Switching arrangement () , comprising{'b': '8', 'i': 'b', 'an input (), and'}{'b': '4', 'at least one switching element (), comprising'}{'b': '10', 'an internal gate port (); and'}an output port;{'b': 4', '10, 'wherein the switching element () is adapted for switching a high voltage at the output port in response to a voltage received at the internal gate port ();'}{'b': '10', 'wherein a maximum internal gate voltage is defined for the internal gate port ();'}{'b': 6', '8', '10, 'i': a,b', 'b, 'wherein at least one circuit element () is arranged between the input () and the internal gate port (); and'}{'b': 4', '10, 'i': 'b', 'sub': 'gate', 'wherein the switching element () comprises a tap port () for providing the current internal gate voltage U.'}22. Switching arrangement () according to claim 1 ,{'b': '4', 'wherein the switching element () is at least one ...

Gate drive circuit

A gate drive circuit for driving an IGBT serving as a power semiconductor device includes a constant-current gate drive circuit that charges a gate capacity of the IGBT at a constant current, and a constant-voltage gate drive circuit that is connected in parallel to the constant-current gate drive circuit between input and output terminals thereof via a series circuit constituted by a MOSFET and a resistor, and charges the gate capacity of the IGBT at a constant voltage, wherein the gate drive circuit charges the gate capacity of the IGBT using both the constant-current gate drive circuit and the constant-voltage gate drive circuit at the time of driving the IGBT.

DRIVER FOR SWITCHING ELEMENT AND CONTROL SYSTEM FOR ROTARY MACHINE USING THE SAME

In a driver, a discharging module discharges, at a discharging rate, the on-off control terminal of a switching element in response to a drive signal being shifted from an on state to an off state. A changing module determines whether a condition including a level of a sense signal being higher than a threshold level during the on state of the drive signal is met, and changes the discharging rate of the on-off control terminal in response to the drive signal being shifted from the off state to the on state upon determination that the condition is met. A loosening module loosens the condition after a lapse of a period since the shift of the drive signal from the off state to the on state in comparison to the condition immediately after the shift of the drive signal from the off state to the on state. 1. A driver for driving , in response to a drive signal , a voltage-controlled switching element having a conductive path , an on-off control terminal , and a sense terminal from which a sense signal correlated with an amount of current flowing through the conductive path is output , the driver comprising:a discharging module configured to discharge, at a predetermined discharging rate, the on-off control terminal of the voltage-controlled switching element for changing the voltage-controlled switching element from an on state to an off state in response to the drive signal being shifted from an on state to an off state;a changing module configured to:determine whether a condition for executing reduction of the discharging rate of the on-off control terminal of the voltage-controlled switching element is met, the condition including a level of the sense signal being higher than a threshold level during the on state of the drive signal; andchange the discharging rate of the on-off control terminal in response to the drive signal being shifted from the off state to the on state upon determination that the condition is met; anda loosening module configured to loosen the ...

DRIVE UNIT FOR DRIVING VOLTAGE-DRIVEN ELEMENT

A controller of a drive unit is configured so as to control a voltage supplied to a gate resistor of a voltage-driven element by using of a voltage of a feedback connector when an electrical connection between the feedback connector and the gate resistor of the voltage-driven element is ensured. Further, the controller of the drive unit is configured so as to control the voltage supplied to the gate resistor of the voltage-driven element by using of a voltage of an output connector when the electrical connection between the feedback connector and the gate resistor of the voltage-driven element is not ensured. 1. A drive unit for driving a voltage-driven element , the drive unit comprising:a first connector configured so as to be connected to a gate resistor of the voltage-driven element;a feedback connector configured so as to be connected to the gate resistor of the voltage-driven element;a second connector configured so as to be connected to a driving power source;a switching element having a first input-output electrode connected to the first connector and a second input-output electrode connected to the second connector; anda controller connected to a control electrode of the switching element and the feedback connector, whereinthe controller is configured so as to:(1) control a voltage supplied to the gate resistor of the voltage-driven element by using a voltage at the feedback connector when an electrical connection between the feedback connector and the gate resistor of the voltage-driven element is ensured, and(2) control the voltage supplied to the gate resistor of voltage-driven element by using a voltage at the first connector when the electrical connection between the feedback connector and the gate resistor of the voltage-driven element is not ensured.2. The drive unit according to claim 1 , whereinthe controller includes an error amplifier, a reference power source, and a resistance member,the error amplifier has one input connector connected to the ...

SEMICONDUCTOR DEVICE AND CIRCUIT FOR CONTROLLING POTENTIAL OF GATE OF INSULATED GATE TYPE SWITCHING DEVICE

A semiconductor device outputs a signal to control a gate potential a switching device. The semiconductor device includes a first signal output terminal, and is capable of receiving or internally creating a reference signal, which varies between a first potential and a second potential. The semiconductor device can switch between first and second operations. The first operation outputs to the first signal output terminal a signal that is at a third potential when the reference signal is at the first potential, and that is at a fourth potential higher than the third potential when the reference signal is at the second potential. The second operation outputs to the first signal output terminal a signal that is at the fourth potential when the reference signal is at the first potential, and that is at the third potential when the reference signal is at the second potential. 13-. (canceled)4. A circuit for controlling a potential of a gate of an insulated gate type switching device , the circuit comprising:a semiconductor device comprising a first signal output terminal, and configured to output a signal to control a potential of a gate of an insulated gate type switching device;an inverting circuit connected to the first signal output terminal, and configured to invert the signal output to the first signal output terminal and to output the inverted signal;a first insulated gate type switching device including a gate that is connected the inverting circuit and receives the inverted signal output from the inverting circuit;a second insulated gate type switching device connected to the first insulated gate type switching device in series; anda low potential wiring being at a potential lower than an average potential of the signal output from the inverting circuit;whereinthe semiconductor device is capable of receiving a reference signal or internally creating the reference signal,the semiconductor device is capable of switching between a first operation and a second ...

ANALOG PHOTOVOLTAIC POWER CIRCUIT WITH AUTO ZERO CALIBRATION

The invention provides an analog photovoltaic power circuit with auto zero calibration, which judges whether the current trend or voltage trend has the same direction as or different direction from the power trend, and adjusts an input/output power conversion accordingly, so that an input current approaches to an optimum current corresponding to a maximum power point, in which the judgments of the current trend, voltage trend and power trend is calibrated with auto-zero circuitry. 1. A photovoltaic power circuit with auto zero calibration , for converting an input current and an input voltage generated by a photovoltaic device to an output current and an output voltage , the photovoltaic power circuit comprising: a current trend indicator circuit for judging a slope direction of the input current at a present time point as compared with the input current at a previous time point in the comparison mode to generate a current trend signal, or a voltage trend indicator circuit for judging a slope direction of the input voltage at the present time point as compared with the input voltage at the previous time point in the comparison mode to generate a voltage trend signal;', 'a power trend indicator circuit for judging a slope direction of the power at the present time point as compared with the power at the previous time point according to the input current and the input voltage in the comparison mode to generate a power trend signal; and', 'a trend comparison circuit for generating a trend comparison result according to the current trend signal and the power trend signal, or according to the voltage trend signal and the power trend signal; and, 'a trend judgment circuit having a storage mode and a comparison mode, the trend judgment circuit includinga power output control circuit which is coupled to the photovoltaic device at an input terminal and extracts electric energy at the input terminal to generate the output current and the output voltage at an output terminal, ...

REGULATOR FOR INTEGRATED CIRCUIT

An electronic circuit includes a functional circuit in series with at least one first current source between two terminals of application of a power supply voltage. The first current source is controllable between an operating mode where it delivers a fixed current, independent from the power consumption of said functional circuit, and an operating mode where it delivers a variable current, depending on the power consumption of the functional circuit. 1. An electronic circuit comprising:a functional circuit;first and second power supply terminals configured to provide a power supply voltage;a first current source coupled with the functional circuit between the first and second power supply terminals, wherein said first current source is configured to deliver a fixed current, independent from a power consumption of said functional circuit, in a first operating mode; and is configured to deliver a a variable current, depending on the power consumption of said functional circuit, in a second operating mode.2. The electronic circuit of claim 1 , further comprising a second current source of variable value coupled to the first current source claim 1 , said second current source being in parallel with said functional circuit and being configured to be active in the first operating mode.3. The electronic circuit of claim 2 , further comprising a differential amplifier configured to measure a power supply voltage level of said functional circuit and control the second current source based on the power supply voltage level of said functional circuit.4. The electronic circuit of claim 3 , wherein the differential amplifier is configured to control said first current source in the second operating mode and regulate a voltage applied to said functional circuit.5. The electronic circuit of claim 1 , wherein said first current source comprises:a current mirror assembly that includes first and second transistors; and a switch coupled to one of the first and second transistors and ...

VOLTAGE REGULATOR DEVICE AND CONTROL METHOD THEREOF

A voltage regulator device includes at least one output unit, a current sensing unit, a control unit, at least one transistor driving unit and a pulse width modulation unit. The output unit outputs an output signal. The output unit includes a first transistor, a second transistor and an energy storage element. The second transistor is electronically connected to the first transistor and the energy storage element, respectively. The current sensing unit is electronically connected to a first end and a second end of the energy storage element. The control unit is electronically connected to the current sensing unit and the output unit, respectively. The transistor driving unit is disposed corresponding to the output unit and is electronically connected to the control unit and the output unit. The pulse width modulation unit is electronically connected to the control unit and the transistor driving unit, respectively. 1. A voltage regulator device , comprising:at least one output unit outputting an output signal, wherein the output unit includes a first transistor, a second transistor and an energy storage element, and the second transistor is electronically connected to the first transistor and the energy storage element, respectively;a current sensing unit electronically connected to the energy storage element to sense a current of the energy storage element,a control unit electronically connected to the current sensing unit and the output unit, respectively;at least one transistor driving unit electronically connected to the control unit and the output unit; anda pulse width modulation unit electronically connected to the control unit and the transistor driving unit, respectively,wherein the control unit selectively controls the first transistor and the second transistor according to the current sensed by the current sensing unit.2. The voltage regulator device according to claim 1 , wherein when the current sensing unit senses that the current of the energy storage ...

CIRCUIT

There is provided a circuit including a capacitor, a current source configured to supply a current to the capacitor, a comparator configured to output a result of comparison between a voltage stored in the capacitor and a predetermined voltage, and a switch section configured to intermittently which is caused to flow to the capacitor by the current source. 1. A circuit comprising:a capacitor;a current source configured to supply a current to the capacitor;a comparator configured to output a result of comparison between a voltage stored in the capacitor and a predetermined voltage; anda switch section configured to intermittently which is caused to flow to the capacitor by the current source.2. The circuit according to claim 1 , further comprising:an output section configured to output a voltage,wherein when, as a result of a gradual change in the stored voltage from an initial value along with the intermittent flowing and blocking performed by the switch section, a magnitude relationship between the stored voltage and the predetermined voltage is reversed, the comparator inverts an output between positive logic and negative logic, andwherein before the output of the comparator is inverted, the output section outputs the stored voltage of the capacitor, and after the output of the comparator is inverted, the output section outputs the predetermined voltage.3. The circuit according to claim 2 ,wherein the output section includes a first switching element, a second switching element, and an inverter,wherein the first switching element and the second switching element are connected in series between a line of the predetermined voltage and a positive terminal of the capacitor,wherein the output section is configured to output a voltage at a connection point between the first switching element and the second switching element,wherein a control terminal of the first switching element is connected to an output terminal of the comparator via the inverter,wherein a control ...

HIGH-FREQUENCY CURRENT REDUCTION DEVICE

In a system line for supplying power from an AC power source to a load through a converter and an inverter, a noise reduction unit is connected to a single connection line between the AC power source and the converter. In the noise reduction unit, a current transformer detects a noise current flowing through the connection line after converting it to a voltage, and the detected voltage V is supplied through a filter device to a voltage amplifier followed by being voltage-amplified and applied to a capacitor. The capacitor is connected to an injection point on the connection line, so that a high-frequency current in the same direction as the noise current is supplied to the converter from the connection line, to thereby reduce a high-frequency noise current at the AC power source side. 1. A high-frequency current reduction device which comprises a noise reduction unit interposed between a first electric device and a second electric device by way of a single connection line between the first electric device and the second electric device , for reducing a high-frequency noise current flowing through the connection line from the first electric device ,said noise reduction unit comprising:a detection unit that detects a noise current flowing through the connection line as a voltage;a filter device that extracts a desired high-frequency component from the detected voltage by the detection unit;a voltage amplifier that amplifies an output from the filter device; anda current injection portion that includes a capacitor whose first terminal is connected to an injection point that is placed on the connection line and nearer to the second electric device than to the detection unit between the first electric device and the second electric device, and that injects a high-frequency current to the connection line;wherein the detection unit is configured with a detection transformer that includes a conductive line serially connected to the connection line and a winding for current ...

Multi-Level DC-DC Converter

Multi-level DC-to-DC converter circuits and methods that permit a full range of output voltages, including near and at zone boundaries. Embodiments alternate among adjacent or near-by zones, operating in a first zone for a selected time and then in a second zone for a selected time. Embodiments may include a parallel capacitor voltage balancing circuit that connects a capacitor to a source voltage to charge that capacitor, or couples two or more capacitors together to transfer charge, all under the control of real-time capacitor voltage measurements. Embodiments may include a lossless voltage balancing solution where out-of-order state transitions are allowed, thus increasing or decreasing the voltage across specific capacitors to prevent voltage overstress on the converter main switches. Restrictions may be placed on the overall sequence of state transitions to reduce or avoid transition state toggling, allowing each capacitor an opportunity to have its voltage steered as necessary for balancing. 1. A converter circuit for converting an input voltage to an output voltage , including:(a) a multi-level converter circuit including at least four switches, at least one capacitor, and at least one inductor;(b) a switched resistance network, coupled to the at least one capacitor and to at least one switch of the at least four switches; and(c) a directional correction circuit, coupled to the at least one capacitor and to the switched resistance network, configured to sense deviations in a voltage across at least one coupled capacitor and generate directional correction signals to the switched resistance network that, alone or in combination, dynamically change a pattern of charge or discharge states for the at least one coupled capacitor to selectively steer the voltage across the at least one coupled capacitor towards a balanced voltage state.2. The invention of claim 1 , wherein the directional correction signals control the switched resistance network to select at least ...

VOLTAGE SWITCHING CIRCUIT AND POWER ADAPTER

Disclosed are a voltage switching circuit and a power adapter having the same. The voltage switching circuit comprises a first switching circuit having a first terminal receiving a first voltage from a first converter, and a second switching circuit having a first terminal receiving a second voltage from a second converter. Second terminals of the first and second switching circuits are electrically connected to form a switching terminal for outputting an output voltage. When the output voltage is required to be switched from the first voltage to the second voltage, the first switching circuit is controlled to be turned off and then the second switching circuit is controlled to be turned on, and when a voltage at the first terminal of the second switching circuit is higher than a preset voltage, the second converter is shut down or kept off. 1. A voltage switching circuit , comprising:a first switching circuit comprising a first switch, and having a first terminal electrically connected to a first output terminal of a first converter and receiving a first voltage outputted from the first converter; anda second switching circuit comprising a second switch, and having a first terminal electrically connected to a second output terminal of a second converter and receiving a second voltage outputted from the second converter,wherein a second terminal of the first switching circuit is electrically connected to a second terminal of the second switching circuit to form a switching terminal for outputting an output voltage, andwherein when the output voltage is required to be switched from the first voltage to the second voltage, the first switching circuit is controlled to be turned off, and then the second switching circuit is controlled to be turned on such that the output voltage is switched to the second voltage, andwherein when a voltage at the first terminal of the second switching circuit is higher than a preset voltage, the second converter is shut down or kept off. ...

CONVERTER WITH HALF-BRIDGE CIRCUIT

A converter with half-bridge circuit is disclosed. The converter includes a voltage source, a first switch, a second switch, a first resonant capacitor, a second resonant capacitor, a resonant inductor, a transformer and a control unit. The control unit is configured to generate a first control signal for turning on/off the first switch and a second control signal for turning on/off the second switch. When the half-bridge converter is turned on or reopened, a first duty rate of a first pulse being the first pulse of the first control signal for turning on the first switch is less than 50%, and a second duty rate of a second pulse being the first pulse of the second control signal for turning on the second switch after the end of the first pulse of the first control signal is greater than 50%. 1. A converter with half-bridge circuit , comprising: a voltage source;', 'a first switch, wherein a first end of the first switch is coupled to a first end of the voltage source;', 'a second switch, wherein a first end of the second switch is coupled to a second end of the first switch and a second end of the second switch is coupled to a second end of the voltage source;', 'a first resonant capacitor, wherein a first end of the first resonant capacitor is coupled to the first end of the first switch;', 'a second resonant capacitor, wherein a first end of the second resonant capacitor is coupled to a second end of the first resonant capacitor and a second end of the second resonant capacitor is coupled to the second end of the second switch;', 'a resonant inductor, wherein a first end of the resonant inductor is coupled to the second end of the first switch and the first end of the second switch;', 'a transformer, wherein a first end of a primary side of the transformer is coupled to a second end of the resonant inductor and a second end of the primary side of the transformer is coupled to the second end of the first resonant capacitor and the first end of the second resonant ...

SYSTEMS AND METHODS FOR DETECTION AND CONTROL RELATED TO CHARGING

Controller and method for charging one or more loads. For example, the controller for charging one or more loads includes: a controller terminal configured to be biased at a first voltage related to a second voltage of a secondary winding of a power converter, the power converter further including a primary winding coupled to the secondary winding, the power converter being configured to, if the power converter is not unplugged from a voltage supply for an AC input voltage, receive the AC input voltage represented by the second voltage and output an output power to the one or more loads; and a voltage detector configured to: process information associated with the first voltage; and determine whether the AC input voltage is in a first voltage state or in a second voltage state based at least in part on the first voltage. 1. A controller for charging one or more loads , the controller comprising:a controller terminal configured to be biased at a first voltage related to a second voltage of a secondary winding of a power converter, the power converter further including a primary winding coupled to the secondary winding, the power converter being configured to, if the power converter is not unplugged from a voltage supply for an AC input voltage, receive the AC input voltage represented by the second voltage and output an output power to the one or more loads; and process information associated with the first voltage; and', 'determine whether the AC input voltage is in a first voltage state or in a second voltage state based at least in part on the first voltage;, 'a voltage detector configured to if the AC input voltage is determined to be in the first voltage state, cause the power converter to set the output power at a first power level;', 'if the AC input voltage is determined in the second voltage state, cause the power converter to set the output power at a second power level;', the first voltage state and the second voltage state are different; and', 'the first ...

SYSTEMS AND METHODS FOR REGULATING POWER CONVERSION SYSTEMS WITH OUTPUT DETECTION AND SYNCHRONIZED RECTIFYING MECHANISMS

System and method for regulating a power conversion system. An example system controller includes: a first controller terminal and a second controller terminal. The system controller is configured to: receive an input signal at the first controller terminal and generate a first drive signal at the second controller terminal based on at least information associated with the input signal to turn on or off a transistor to affect a current associated with a secondary winding of the power conversion system. The system controller is further configured to: in response to the input signal changing from a first value larger than a first threshold to a second value smaller than the first threshold, change the first drive signal from a first logic level to a second logic level to turn on the transistor. 118.-. (canceled)19. A system for regulating a power conversion system , the system comprising: receive an input signal associated with an output voltage related to a secondary winding of a power conversion system; and', 'generate a first drive signal based on at least information associated with the input signal to turn on or off a transistor to affect a first current associated with the secondary winding of the power conversion system; and, 'a first system controller configured to receive a feedback signal associated with the first drive signal;', 'generate a second drive signal based on at least information associated with the feedback signal; and', 'output the second drive signal to a switch to affect a second current flowing through a primary winding of the power conversion system;, 'a second system controller configured to the first system controller is further configured to, in response to the input signal indicating that the output voltage changes from a first value larger than a first threshold to a second value smaller than the first threshold, generate one or more pulses of the first drive signal to turn on and off the transistor; and', process the feedback signal to ...

CONTROL OF A STARTUP CIRCUIT USING A FEEDBACK PIN OF A PWM CONTROLLER INTEGRATED CIRCUIT CHIP

A power supply includes a control transistor that controls a primary winding of a transformer to induce current on a secondary winding of the transformer to generate an output voltage. A pulse width modulation (PWM) controller integrated circuit (IC) chip drives the control transistor through a gate pin. The PWM controller IC chip has a feedback pin that receives a feedback signal indicative of the output voltage. A high voltage (HV) startup transistor is controlled through the feedback pin. The HV startup transistor turns ON during startup to generate a supply voltage from current received from the input voltage of the power supply. The HV startup transistor turns OFF when the supply voltage reaches a startup voltage level that is sufficient to start the switching operation of the control transistor and thereby receive operating current from an auxiliary winding of the transformer. 1. An integrated circuit (IC) chip comprising:a gate pin that is configured to output a control signal for driving a control transistor of a switching mode power supply;a current sense pin that is configured to receive a current sense signal indicative of a current through the control transistor;a feedback pin that is configured to receive a feedback signal that is indicative of an output voltage of the switching mode power supply and is configured to be connected to a control terminal of a high voltage (HV) startup transistor that is external to the IC chip; anda pulse width modulator that is configured to generate the control signal that is output at the gate pin to regulate the output voltage by pulse width modulation (PWM) based on the feedback signal and the current sense signal.2. The IC chip of claim 1 , further comprising:a supply voltage pin that is configured to receive a supply voltage.3. The IC chip of claim 2 , wherein the IC chip is configured to connect the feedback pin to the supply voltage pin during startup of the switching mode power supply.4. The IC chip of claim 1 , ...

CONTROL METHOD OF INVERTER CIRCUIT

A control method of an inverter circuit includes the following steps. Firstly, a half cycle of the AC output voltage is divided into a first stage and a second stage. Then, the upper switch element and the lower switch element are controlled to be operated at a first switching frequency lower than a preset threshold frequency in the first stage, so that the inverter circuit is operated in a continuous current mode. Then, the upper switch element or the lower switch element of the bridge arm is controlled to be operated at a second switching frequency in the second stage, so that the upper switch element and the lower switch element are turned on at a preset voltage level and the inverter circuit is operated at a discontinuous current mode boundary mode. 1. A control method for controlling an inverter circuit , the inverter circuit comprising at least one bridge arm , an inductor and a parasitic capacitor , the bridge arm comprising an upper switch element and a lower switch element connected in series , the upper switch element and the lower switch element being alternately turned on and turned off to convert a DC input voltage to an AC output voltage , the control method comprising steps of:dividing a half cycle of the AC output voltage into a first stage and a second stage;controlling the upper switch element and the lower switch element of the bridge arm to be operated at a first switching frequency lower than a preset threshold frequency in the first stage, so that the inverter circuit is operated in a continuous current mode; andcontrolling the upper switch element and the lower switch element of the bridge arm to be operated at a second switching frequency in the second stage, so that the upper switch element and the lower switch element are turned on at a preset voltage level and the inverter circuit is operated at a discontinuous current mode boundary mode.2. The control method according to claim 1 , wherein the first stage corresponds to a head region and a ...

TRAILING EDGE DETECTOR USING CURRENT COLLAPSE

A controller for a power converter compares a voltage sense signal to a first reference and compares a current sense signal to a current sense signal. The voltage sense signal is representative of an input voltage of the power converter. The current sense signal is representative of a current through the power converter. A slope of the voltage sense signal is measured over time. An edge detection is asserted by the controller when (1) the voltage sense signal is larger than the first reference, (2) the current sense signal is lower than the second reference, and (3) the slope is a negative slope. 1. A controller for a power converter , the controller comprising: a first comparator coupled to assert a first output signal in response to a voltage sense signal being greater than a first reference, wherein the voltage sense signal is representative of an input voltage of the power converter;', 'a second comparator coupled to assert a second output signal in response to a current sense signal being less than a second reference different from the first reference, wherein the current sense signal is representative of a current through the power converter;', 'a slope sense module coupled to assert a slope signal in response to the voltage sense signal decreasing over time; and', 'an edge driver circuit coupled to generate an edge signal in response to assertions of the first output signal, the second output signal, the slope signal, and an enable signal received from a bleeder control circuit; and, 'an edge detection circuit includinga drive circuit coupled to output a drive signal in response to the edge signal, wherein the drive signal is for controlling a switch coupled to regulate an output of the power converter.2. The controller of claim 1 , wherein the controller includes the bleeder control circuit and the bleeder control circuit comprises:a bleeder enable circuit coupled to generate the enable signal in response to the voltage sense signal.3. The controller of ...

INTEGRATED HETEROGENOUS POWER MANAGEMENT CIRCUITRIES

A semiconductor package includes a first die and a second die. The first die includes a first plurality of compound semiconductor transistors, and where the first die includes a first section of a Power Management Circuitry (PMC). The second die includes a second plurality of transistors that are arranged as a plurality of CMOS (Complementary metal-oxide-semiconductor) circuitries, and where the second die includes a second section of the PMC. The PMC includes a power converter that includes: a plurality of power switches, a plurality of driver circuitries to correspondingly control the plurality of power switches, and a controller to control the driver circuitries. The first section of the PMC in the first die includes the plurality of power switches, and the second section of the PMC in the second die includes at least a part of the controller. 1. A semiconductor package comprising:a first die comprising a first plurality of transistors, wherein an individual transistor of the first plurality of transistors comprises type III-V compound semiconductor material, and wherein the first die includes a first section of a Power Management Circuitry (PMC); anda second die comprising a second plurality of transistors that are arranged as a plurality of CMOS (Complementary metal-oxide-semiconductor) circuitries, and wherein the second die includes a second section of the PMC,wherein the PMC comprises a power converter that includes: a plurality of power switches, a plurality of driver circuitries to correspondingly control the plurality of power switches, and a controller to control the driver circuitries,wherein the first section of the PMC in the first die includes the plurality of power switches, andwherein the second section of the PMC in the second die includes at least a part of the controller.2. The semiconductor package of claim 1 , wherein the type III-V compound semiconductor material comprises one or more of: Gallium (Ga) claim 1 , Nitrogen (N) claim 1 , Arsenic ...

Filter Circuit

A filter circuit comprising a first feedback circuit configured to: receive a sensed-voltage-level-signal representative of a sensed voltage across a current sensing element receive a voltage-set-point-signal; and set a regulation-control-signal for a current regulation device such that the sensed-voltage-level-signal tends towards the voltage-set-point-signal. The filter circuit also comprises a second feedback circuit configured to: receive a predetermined-threshold-signal; and receive a regulation-control-voltage-signal, representative of a voltage level of the regulation-control-signal. The second feedback circuit is configured to adjust the voltage-set-point-signal in accordance with a comparison between the regulation-control-voltage-signal and the predetermined-threshold-signal. 1. A filter circuit comprising:a first input terminal;a reference terminal, wherein the filter circuit is configured to receive an input voltage waveform across the first input terminal and the reference terminal;a current regulation device; anda current sensing element, the current regulation device comprises a conduction channel and a control terminal, wherein the current regulation device is configured to regulate current flow through the conduction channel in accordance with a regulation-control-signal received at its control input; and', 'the current sensing element and the conduction channel of the current regulation device, are connected in series with each other between the first input terminal and the reference terminal;, 'wherein [ receive a sensed-voltage-level-signal representative of a sensed voltage across the current sensing element;', 'receive a voltage-set-point-signal; and', 'set the regulation-control-signal such that the sensed-voltage-level-signal tends towards the voltage-set-point-signal; and, 'a first feedback circuit configured to, receive a predetermined-threshold-signal;', 'receive a regulation-control-voltage-signal, representative of a voltage level of the ...

A DRIVING POWER SUPPLY APPARATUS FOR OLED

The present invention discloses a driving power supply apparatus for OLED. Wherein it comprises a power board connecting to a motherboard and a OLED screen, the motherboard comprises a standby circuit, a timing control module, a first and second transformer modules and a PFC circuit, the standby circuit connects to the timing control module and the motherboard, the timing control module connects to the PFC circuit, the motherboard and the first and second transformer modules, which connect to the motherboard and the PFC circuit. The isolation of two voltages, fulfills stability requirements of the power supplied to OLED, improves its picture quality; the timing control module will not light up the OLED screen until both switch and enable signals are stable simultaneously. This has changed the traditional power switch sequence, and made the power supply adapt to OLED's fast response characters. 1. A driving power supply apparatus for OLED comprises a power board connecting to both a motherboard and an OLED screen , wherein , the power board comprises: a standby circuit , a timing control module , a first transformer module , a second transformer module and a PFC circuit;the standby circuit is configured to output a power at supply voltage to the motherboard then supply the timing control module after connecting to an outside power source;the timing control module starts the PFC circuit based on a switch signal fed back from the motherboard, and the PFC circuit outputs a high voltage direct current (HVDC) to the timing control module, the first transformer module and the second transformer module;then the timing control module will turn on the first transformer module and the second transformer module, based on the HVDC signals output from the PFC circuit together with an enable signal, wherein, the first transformer module converts the HVDC into a first voltage before supplying to the motherboard, and the second transformer module is configured to convert the HVDC ...

SINGLE-INDUCTOR, MULTIPLE-OUTPUT, DC-DC CONVERTER

A single-inductor, multiple-output, DC-DC converter has regulation circuitry that controls switches to alternately charge at least two capacitors associated with at least two DC output voltages via the single inductor from a DC input port. The regulation circuitry determines whether the DC-DC converter is operating in continuous conduction mode (CCM) or discontinuous conduction mode (DCM). In CCM mode, the regulation circuitry regulates the charging duty cycle for a first output voltage and generates the initial charging duty cycle for regulating each other output voltage by scaling the first output voltage duty cycle. In DCM mode, the regulation circuitry independently regulates the charging duty cycles for each output voltage and stores each duty cycle to be used for the next charging period for the same output voltage. The regulation circuitry detects and handles undershoot and overshoot conditions to accelerate recovery at the output ports. 1. A single inductor , multiple-output , DC-DC converter that converts a DC input voltage at an input port into at least first and second output voltages at respective first and second output ports , the DC-DC converter comprising:an inductor;at least first and second capacitors respectively connected to the first and second output ports;a plurality of switches that selectively connect the input port to either the first capacitor or the second capacitor via the inductor; and the regulation circuitry determines whether the DC-DC converter is operating in continuous conduction mode (CCM) or discontinuous conduction mode (DCM);', 'for the CCM mode, (i) the regulation circuitry regulates the first output voltage and (ii) the regulation circuitry regulates the second output voltage dependent on the regulation of the first output voltage; and', 'for the DCM mode, (i) the regulation circuitry regulates the first output voltage independent of the regulation of the second output voltage and (ii) the regulation circuitry regulates the ...

Method for Operating a Voltage Converter

Various embodiments include a method for operating a bidirectional voltage converter with an input-side half-bridge, an output-side half-bridge, and a bridge branch having a bridge inductance, comprising: determining an actual mean bridge current value flowing through the bridge branch during a respective subsequent switching cycle T1 of the transistor switches in a respective current switching cycle T0; determining switch-on time points and switch-on durations of the respective transistor switches for the respective subsequent switching cycle T1; and switching on the respective transistor switches at the respective ascertained switch-on time points and for the respective ascertained switch-on durations in the respective subsequent switching cycle T1. 1. A method for the operation of a bidirectional voltage converter with an input-side half-bridge circuit having respectively a positive-voltage-side and a negative voltage side transistor switch connected in series with one another , an output-side half-bridge circuit having respectively a positive-voltage-side and a negative-voltage-side transistor switch connected in series with one another , and a bridge branch having a bridge inductance , the method comprising:determining an actual mean bridge current value IL avg mess flowing through the bridge branch during a respective subsequent switching cycle T1 of the transistor switches in a respective current switching cycle;determining switch-on time points and switch-on durations of the respective transistor switches for the respective subsequent switching cycle T1;switching on the respective transistor switches at the respective ascertained switch-on time points and for the respective ascertained switch-on durations in the respective subsequent switching cycle T1.2. The method as claimed in claim 1 , wherein determining the switch-on time points and the switch-on durations includes using a predefined mean setpoint bridge current value IL_avg_soll.3. The method as ...

Light Load Mode Entry or Exit for Power Converter

During a first mode of operation, a zero current detect (ZCD) signal is asserted in response to detecting a zero current condition at a switch node of a power converter. The power converter enters a light load mode of operation when the ZCD signal is asserted between a beginning point and a trigger point of a period of a PWM signal. A compensator voltage is generated based on a feedback voltage indicative of an output voltage. The compensator voltage is compared to a threshold voltage that represents a limit for the compensator voltage during the light load mode of operation determined over a range of the output voltage. The power converter exits the light load mode back to the first mode of operation in response to the compensator voltage being beyond the threshold voltage. 1. A method comprising:asserting a zero current detect (ZCD) signal in response to detecting a zero current condition at a switch node of a power converter during a first mode of operation;detecting that the ZCD signal is asserted between a beginning point and a trigger point of a period of a pulse width modulation (PWM) signal; andentering a light load mode of operation for the power converter in response to the detecting that the ZCD signal is asserted between the beginning point and the trigger point of the period of the PWM signal.2. The method of claim 1 , further comprising:generating a compensator voltage based on a feedback voltage and a reference voltage, the feedback voltage being indicative of an output voltage of the power converter, the reference voltage being indicative of a desired voltage level of the output voltage;comparing the compensator voltage to a threshold voltage, the threshold voltage representing a limit for the compensator voltage during the light load mode of operation based on an inductance of an output inductor, a current sense gain of a synchronous switch of the power converter, a frequency of the PWM signal, a duty cycle of the PWM signal, an amplitude of a ...

SWITCHING CONTROL CIRCUIT, SWITCHING CONTROL METHOD AND FLYBACK CONVERTER THEREOF

A switching control circuit for a flyback converter having a main switch coupled to a primary winding of a transformer and a rectifier switch coupled to a secondary winding of the transformer, can include: a first voltage generating circuit configured to generate a first voltage sampling signal representing information of an input voltage; a synchronous rectification control circuit configured to adjust an on-time of the rectifier switch according to the first voltage sampling signal in order to adjust an absolute value of a negative current flowing through the secondary winding; and where the negative current is configured to discharge a parasitic capacitor of the main switch in order to reduce a drain-source voltage of the main switch. 1. A switching control circuit for a flyback converter having a main switch coupled to a primary winding of a transformer and a rectifier switch coupled to a secondary winding of the transformer , the switching control circuit comprising:a) a first voltage generating circuit configured to generate a first voltage sampling signal representing information of an input voltage;b) a synchronous rectification control circuit configured to adjust an on-time of the rectifier switch according to the first voltage sampling signal in order to adjust an absolute value of a negative current flowing through the secondary winding; andc) wherein the negative current is configured to discharge a parasitic capacitor of the main switch in order to reduce a drain-source voltage of the main switch.2. The switching control circuit of claim 1 , wherein the main switch is turned on when the drain-source voltage of the main switch resonates to the lowest value.3. The switching control circuit of claim 1 , wherein the synchronous rectification control circuit is configured to:a) increase the on-time of the rectifier switch to increase the absolute value of the negative current flowing through the secondary winding when the input voltage increases; andb) ...

RECTIFYING CIRCUIT AND SWITCHED-MODE POWER SUPPLY INCORPORATING RECTIFYING CIRCUIT

Disclosed are a rectifying circuit and a switched-mode power supply. The rectifying circuit includes a first rectifying section for rectifying a positive induced voltage generated across a secondary winding of a transformer, a second rectifying section for rectifying a negative induced voltage generated across the secondary winding, and an inductance section connected between the first rectifying section and the second rectifying section. The switched-mode power supply includes a transformer having a primary winding and a secondary winding, a drive circuit for switchingly driving the primary winding of the transformer, and the rectifying circuit connected to the secondary winding of the transformer. 1. A rectifying circuit comprising:a first rectifying section for rectifying a positive induced voltage generated across a secondary winding of a transformer;a second rectifying section for rectifying a negative induced voltage generated across the secondary winding; andan inductance section connected between the first rectifying section and the second rectifying section.2. The rectifying circuit according to claim 1 , whereinthe inductance section includes an auxiliary winding coupled to a primary winding of the transformer.3. The rectifying circuit according to claim 2 , whereina degree of coupling between the primary winding and the auxiliary winding is smaller than a degree of coupling between the primary winding and the secondary winding.4. The rectifying circuit according to claim 2 , whereinthe inductance section includes a connection coil for limiting a short-circuiting current flowing through the auxiliary winding.5. The rectifying circuit according to claim 4 , whereinthe connection coil includes a balancing coil having a midpoint tap connected to an output terminal for outputting an output voltage.6. The rectifying circuit according to claim 1 , whereinthe inductance section includes a connection coil not coupled to a primary winding of the transformer.7. The ...

DRIVE CIRCUIT

A drive circuit includes: a current capability switch configured to switch a current capability of driving an output transistor of a switching power supply according to whether a switch current flowing through the output transistor is in a continuous mode or in a discontinuous mode. 1. A drive circuit comprising:a current capability switch configured to switch a current capability of driving an output transistor of a switching power supply according to whether a switch current flowing through the output transistor is in a continuous mode or in a discontinuous mode.2. The drive circuit of claim 1 , wherein the current capability switch is further configured to lower the current capability when the switch current is in the continuous mode claim 1 , and raise the current capability when the switch current is in the discontinuous mode.3. The drive circuit of claim 2 , further comprising:a first transistor connected between a first power supply terminal and a control terminal of the output transistor; anda second transistor connected between a second power supply terminal and the control terminal of the output transistor,wherein the output transistor is driven by complementarily turning on/off the first transistor and the second transistor.4. The drive circuit of claim 3 , wherein the current capability switch includes a third transistor connected in parallel to the first transistor or the second transistor claim 3 , and is configured to turn off the third transistor when the switch current is in the continuous mode claim 3 , and turn on or off the third transistor in synchronization with the first transistor or the second transistor when the switch current is in the discontinuous mode.5. The drive circuit of claim 3 , wherein the current capability switch includes a third transistor connected in series with the first transistor or the second transistor claim 3 , and is further configured to set the third transistor in a half-on state when the switch current is in the ...

RESONANT SWITCHING REGULATOR WITH CONTINUOUS CURRENT

A switched-mode power regulator circuit has four solid-state switches connected in series and a capacitor and an inductor that regulate power delivered to a load. The solid-state switches are operated such that a voltage at the load is regulated by repetitively (1) charging the capacitor causing an increase in current flow in the inductor followed by a decrease in current flow in the inductor and before the current flow in the inductor stops, (2) discharging the capacitor causing an increase in current flow in the inductor followed by a decrease in current flow in the inductor and before the current flow in the inductor stops, repeating (1). 1. A power conversion circuit comprising:a first terminal;a first solid-state switch having a pair of first switch terminals and a first control terminal, the pair of first switch terminals connected between the first terminal and a first junction;a second solid-state switch having a pair of second switch terminals and a second control terminal, the pair of second switch terminals connected between the first junction and a second junction;a third solid-state switch having a pair of third switch terminals and a third control terminal, the pair of third switch terminals connected between the second junction and a third junction;a fourth solid-state switch having a pair of fourth switch terminals and a fourth control terminal, the pair of fourth switch terminals connected between the third junction and a ground;a capacitor coupled between the first junction and the third junction, and an inductor coupled between the second junction and a load; anda controller transmitting control signals to control the first, second, third and fourth solid-state switches through the first, second, third and fourth control terminals, respectively, such that a voltage at the load is regulated by repetitively (1) charging the capacitor causing an increase in current flow in the inductor followed by a decrease in current flow in the inductor and before ...

POWER CONVERTER

A power converter includes: a power converter main circuit that includes semiconductor switching elements; gate drive circuits driving the semiconductor switching elements, respectively; and one or a plurality of impedance element groups connected between at least one pair of the gate drive circuits. At least one of the gate drive circuits includes a detector that detects a voltage across the impedance element group, and changes the driving speed of the semiconductor switching elements in accordance with an output of the detector. 1. A power converter comprising:a power converter main circuit including two or more semiconductor switching elements;gate drive circuits, each of which drives a corresponding one of the semiconductor switching elements; andone or a plurality of impedance elements connected between at least one pair of the gate drive circuits, whereinat least one of the gate drive circuits includes a detector to detect a voltage across the impedance elements or a current flowing through the impedance elements, and changes a driving speed of the semiconductor switching elements in accordance with an output of the detector.2. The power converter according to claim 1 , whereinthe power converter main circuit includes a multi-level circuit corresponding to one phase or a plurality of phases to select a potential of any one of two or more DC terminals and output the selected potential to a load,the multi-level circuit includes two or more semiconductor switching elements connected in series, andthe impedance element is disposed between the gate drive circuits belonging to a same phase.3. The power converter according to claim 2 , whereinthe multi-level circuit is a two-level circuit to select a potential of either one of an upper DC terminal and a lower DC terminal and output the selected potential to the load,the two-level circuit includes a first semiconductor switching element and a second semiconductor switching element sequentially connected in series ...

SWITCHING CONVERTER WITH QUASI-RESONANT CONTROL AND THE METHOD THEREOF

A switching converter with quasi-resonant control having a switch and an energy storage component, comprising a peak current regulating circuit configured to provide a peak current regulating signal to regulate a peak current signal or a current sense signal, wherein the peak current regulating signal is adjusted when non-CCM (Current Continuous Mode) and non-valley-switching are detected. 1. A switching converter , comprising:an energy storage component;a switch coupled to the energy storage component;a peak current comparing circuit configured to generate a current control signal by comparing a current sense signal indicative of a current flowing through the energy storage component with a peak current signal; anda first logic circuit configured to generate a switching control signal to turn on and off the switch based on a frequency control signal and the current control signal; anda peak current regulating circuit configured to adjust the peak current signal or to adjust the current sense signal when two conditions are met: (1) the switching regulator is working under a non-CCM (non-current continuous-mode) and (2) a voltage across the switch is higher than a valley reference signal at the time the switch is turned on.2. The switching converter of claim 1 , wherein the peak current regulating circuit comprises:a pulse circuit configured to generate a pulse for a switching cycle when two conditions are met, (1) the switching regulator is working under the non-CCM (non-current continuous mode) and (2) the voltage across the switch is higher than the valley reference signal at the time the switch is turned on;a counting circuit configured to generate a counting signal by counting pulses from the pulse circuit; anda DAC (digital-to-analog-converting) circuit configured to convert the counting signal to a peak current regulating signal.3. The switching converter of claim 1 , wherein the peak current regulating circuit comprises:a counting circuit configured to ...

DC/DC RESONANT CONVERTERS AND POWER FACTOR CORRECTION USING RESONANT CONVERTERS, AND CORRESPONDING CONTROL METHODS

Various improvements are provided to resonant DC/DC and AC/DC converter circuit. The improvements are of particular interest for LLC circuits. Some examples relate to self-oscillating circuit and others relate to converter circuits with frequency control, for example for power factor correction, driven by an oscillator. 1. An AC/DC PFC converter , comprising:an AC input;a rectifier;a half bridge inverter comprising a first switch and a second switch, wherein a first output is defined from a node between the switches;a self-oscillating resonant circuit coupled to the first output and having a second output for providing a converter output voltage or current and wherein the self-oscillating resonant circuit is arranged for providing an electrical feedback parameter; and an input for receiving a threshold value for the electrical feedback parameter;', 'an output circuit for generating the gate drive signal based on a comparison of the electrical feedback parameter with the threshold in a first mode; and', 'a timeout circuit arranged to provide a restart signal for restarting switching of the gate drive in a second mode wherein the electrical feedback parameter fails to achieve the desired threshold., 'a self-oscillating control circuit for generating a gate drive signal for controlling the switching of the first switch and second switch in dependence on the electrical feedback parameter in order to control the converter output voltage or current, wherein a high gate drive signal turns on one switch and turns off the other switch and a low gate drive signal turns off the one switch and turns on the other switch, wherein the control circuit comprises2. The converter as claimed in claim 1 , wherein the electrical feedback parameter is a state variable.3. The converter as claimed in claim 1 , wherein the self-oscillating resonant circuit comprises an LLC circuit.4. The converter as claimed in claim 3 , wherein the electrical feedback parameter is provided by the LLC ...

CONTROL CIRCUIT FOR SWITCHING POWER SUPPLY

A control circuit for a switching power includes a driver unit that receives an error signal outputted from an error amplifier and generates driving pulses to be applied to a power semiconductor switching device on the basis of the error signal; a short-circuit detection circuit that determines whether a short-circuit occurs between a feedback terminal and a comp terminal of the control circuit; a holding circuit that holds the error signal; and a switching circuit, wherein when the short-circuit detection circuit determines that the short-circuit occurs, the switching circuit provides an error signal held by the holding circuit prior to the detection of the short-circuit to the driver unit instead of the error signal outputted from the error amplifier so that the driver unit does not generate the driving pluses based on the error signal outputted from the error amplifier when the short-circuit is determined to have occurred. 1. A control circuit for a switching power supply that generates a prescribed output by switching a power semiconductor switching device ON and OFF , the control circuit comprising:a first external terminal that receives a signal representing an output voltage of the switching power supply;an error amplifier that compares the signal input to the first external terminal to a reference value and outputs, from an output terminal thereof, an error signal corresponding to a difference between the signal from the first external terminal and the reference value;a second external terminal internally connected to the output terminal of the error amplifier, the second external terminal being for connecting to an externally provided phase compensation circuit;a driver unit that receives the error signal outputted from the error amplifier and generates driving pulses to be applied to the power semiconductor switching device so as to turn the power semiconductor switching device ON and OFF on the basis of the error signal;a short-circuit detection circuit ...

SYSTEMS AND METHODS FOR REDUCING SWITCHING LOSS IN POWER CONVERSION SYSTEMS

Power converter and method thereof according to certain embodiments. For example, the power converter includes a primary winding, and a secondary winding coupled to the primary winding. Additionally, the power converter includes a first switch including a first switch terminal, a second switch terminal, and a third switch terminal. The first switch is configured to affect a first current associated with the primary winding. The first switch terminal corresponds to a first voltage, and the second switch terminal corresponds to a second voltage. The first voltage minus the second voltage is equal to a voltage difference. Moreover, the power converter includes a second switch including a fourth switch terminal, a fifth switch terminal, and a sixth switch terminal and configured to affect a second current associated with the secondary winding. 1. A power converter , the power converter comprising:a primary winding;a secondary winding coupled to the primary winding;a first switch including a first switch terminal, a second switch terminal, and a third switch terminal, the first switch being configured to affect a first current associated with the primary winding, the first switch terminal corresponding to a first voltage, the second switch terminal corresponding to a second voltage, the first voltage minus the second voltage being equal to a voltage difference;a second switch including a fourth switch terminal, a fifth switch terminal, and a sixth switch terminal and configured to affect a second current associated with the secondary winding;a sampled-voltage generator configured to sample a third voltage before the first switch becomes closed and generate a sampled voltage based at least in part on the third voltage, the third voltage being related to the voltage difference before the first switch becomes closed;an error amplifier configured to receive the sampled voltage and a reference voltage and generate an amplified voltage based at least in part on the sampled ...

REVERSIBLE AC-DC AND DC-AC TRIAC CONVERTER

A reversible converter includes a first field effect transistor and a second field effect transistor that are coupled in series between a first terminal and a second terminal for a DC voltage. A first triac and a second triac are also coupled in series between the first and second terminals of the DC voltage. Midpoints of the series coupled devices are coupled, through an inductive element, to first and second terminals for an AC voltage. Actuation of the transistors and triacs is controlled in distinct manners to operate the converter in an AC-DC conversion mode and a DC-AC conversion mode. 1. A reversible converter , comprising:a first field effect transistor and a second field effect transistor coupled in series between a first terminal and a second terminal associated with a DC voltage;an inductive element linking a first midpoint of the series coupling of the first and second field effect transistors to a first terminal associated with an AC voltage; anda first triac and a second triac coupled in series between the first and second terminals associated with the DC voltage, wherein a second midpoint of the series coupling of the first and second triacs being linked to a second terminal associated with said AC voltage.2. The converter according to claim 1 , further comprising:a first diode connected in parallel with the first field effect transistor with a anode terminal of the first diode coupled to the first midpoint; anda second diode connected in parallel with the second field effect transistor with a cathode terminal coupled to the first midpoint.3. The converter according to claim 2 , wherein each diode of the first and second diodes is an intrinsic drain-source diode of a field effect transistor.4. The converter according to claim 1 , wherein a gate of each triac of the first and second triacs is on a side associated with the second midpoint.5. The converter according to claim 1 , wherein a gate of each triac of the first and second triacs is on a side ...

CALCULATION APPARATUS AND PROCESSING APPARATUS

A calculation apparatus includes an encoder configured to detect rising edges of PWM signals having at least three or more phases in each of the phases, and a register configured to store, at a timing after the PWM signals having the respective phases rise and after AD conversion of a current value of a drive signal of a motor obtained by the PWM signals, a difference value between the AD-converted current value and a previous AD-converted current value for each phase. 1. A calculation apparatus comprising:an encoder configured to detect rising edges of PWM signals having at least three or more phases in each of the phases; anda register configured to store, at a timing after the PWM signals having the respective phases rise and after AD conversion of a current value of a drive signal of a motor obtained by the PWM signals, a difference value between the AD-converted current value and a previous AD-converted current value for each phase.2. The calculation apparatus according to claim 1 , further comprising an AD converter configured to AD-convert the current value of the drive signal of the motor obtained by the PWM signals claim 1 , wherein the register stores the current value AD-converted by the AD converter for each phase.3. The calculation apparatus according to claim 2 , further comprising a current sensor of a one shunt current detection method configured to detect current by switching current in a plurality of phases using one detection element claim 2 , wherein the AD converter AD-converts the current value detected by the current sensor.4. The calculation apparatus according to claim 1 , further comprising:an ADC register configured to store the previous AD-converted current value; anda subtracter configured to subtract the previous AD-converted current value from the AD-converted current value and obtain a difference value, wherein the register stores the difference value obtained by the subtracter.5. A processing apparatus comprising:a compare register ...

DC/DC RESONANT CONVERTERS AND POWER FACTOR CORRECTION USING RESONANT CONVERTERS, AND CORRESPONDING CONTROL METHODS

Various improvements are provided to resonant DC/DC and AC/DC converter circuit. The improvements are of particular interest for LLC circuits. Some examples relate to self-oscillating circuit and others relate to converter circuits with frequency control, for example for power factor correction, driven by an oscillator. 1. An AC/DC PFC converter , comprising:an AC input for providing an input voltage and an input current to an input of a rectifier, wherein the rectifier is arranged for rectifying the input voltage to obtain a rectified input voltage;a half bridge inverter for receiving the rectified input voltage and comprising a first switch and a second switch, wherein a first output is defined from a node between the first and second switches;an LLC circuit coupled to the first output and having a second output for supplying a converter output voltage and current, wherein a voltage across a capacitor of the LLC circuit is provided as an electrical feedback parameter, wherein the electrical feedback parameter is representative of the input current, wherein the capacitor is arranged for acting as a resonance capacitor; anda control circuit for generating a gate drive signal for controlling the switching of the first switch and the second switch in dependence on the electrical feedback parameter, wherein a high gate drive signal turns on one switch of the first and seconds switches and turns off another switch of the first and seconds switches and a low gate drive signal turns off the one switch and turns on the other switch,a correction unit for modifying a relationship between the threshold level for the electrical feedback parameter and the rectified input voltage to the circuit,wherein the control circuit comprises an outer control loop for setting a threshold level for the electrical feedback parameter proportional to the converter output voltage or current and the rectified input voltage without measurement of the input current, and an inner control loop for ...

BOOT STRAP CAPACITOR CHARGING FOR SWITCHING POWER CONVERTERS

A charging path is provided for the charging of an bootstrap capacitor that stores a driver power supply voltage for driving an active clamp switch transistor in a flyback converter. The charging path couples charge from an active clamp capacitor to charge the bootstrap capacitor. 1. A flyback converter , comprising:an active clamp capacitor;a bootstrap capacitor for storing a driver power supply voltage for driving an active clamp switch transistor connected to a positive plate of the active clamp capacitor, wherein the active clamp capacitor has a negative plate connected to a primary winding of a transformer;a power supply capacitor for storing a power supply voltage for a controller for controlling the switching of a power switch transistor;a first diode coupled between bootstrap capacitor and the power supply capacitor for coupling charge from the power supply capacitor to charge the bootstrap capacitor; anda second diode in series with a resistor connected between the positive plate of the active clamp capacitor and the bootstrap capacitor for coupling charge from the active clamp capacitor to charge the bootstrap capacitor.2. The flyback converter of claim 1 , wherein a terminal of the active clamp switch transistor is coupled to a drain of the power switch transistor.3. (canceled)4. (canceled)5. (canceled)6. (canceled)7. (canceled)8. (canceled)9. The flyback converter of claim 2 , wherein the active clamp switch transistor is an NMOS transistor.10. The flyback converter of claim 2 , wherein the active clamp switch transistor is an PMOS transistor.11. (canceled)12. (canceled)13. (canceled)14. (canceled)15. (canceled)16. (canceled)17. A method of operation for a flyback converter claim 2 , comprising:charging a power supply capacitor to provide a power supply voltage to a controller for the flyback converter;conducting charge from the power supply capacitor through a diode path to charge a bootstrap capacitor to provide a driver power supply voltage for ...

LLC RESONANT CONVERTER

The LLC resonant converter includes a bridge circuit configured to receive a DC input voltage, an LLC resonant circuit connected to the bridge circuit, a transformer connected to the LLC resonant circuit, a rectifier circuit connected to the transformer and configured to send out a converted DC voltage, a resonant capacitor changeover circuit, a bridge circuit control section, and a resonant capacitor changeover control section. When the input voltage exceeds a changeover voltage, the operating frequency is raised higher than the resonance frequency, and thereafter the switch is turned off. 1. An LLC resonant converter comprising:a bridge circuit configured to receive a DC input voltage and to send out a square-wave voltage by a switching operation of a switching element;an LLC resonant circuit having at least a first capacitor and configured to resonate on receiving the square-wave voltage;a transformer having a primary side connected to the LLC resonant circuit and a secondary side isolated from the primary side;a rectifier element configured to convert an output from the secondary side of the transformer into a DC output voltage;a smoothing capacitor configured to smooth the output voltage from the rectifier element;a resonant capacitor changeover circuit having a changeover switch and a second capacitor that are connected in series to each other and connected in parallel to the first capacitor;an input voltage detection circuit configured to detect the input voltage;an output voltage detection circuit configured to detect the output voltage;an output current detection circuit configured to detect an output current fed to a load;a resonant capacitor changeover control section configured to control a state of the changeover switch in the resonant capacitor changeover circuit, based on at least one of the input voltage detected by the input voltage detection circuit, the output voltage detected by the output voltage detection circuit, and the output current ...

Circuit Comprising an Accelerating Element

A circuit includes a switching element with a first terminal, a second terminal and a control terminal. The circuit also includes an impedance network coupled between the control terminal and a switching node. The circuit also includes a first accelerating element coupled between the control terminal and a first node. The first node is different from the switching node. The circuit is configured to temporarily activate the first accelerating element when a switching state of the switching element is to be changed. 1. A circuit , comprising:a switching element with a first terminal, a second terminal and a control terminal;an impedance network coupled between the control terminal and a switching node; anda first accelerating element coupled between the control terminal and a first node, the first node being different from the switching node;wherein the circuit is configured to temporarily activate the first accelerating element when a switching state of the switching element is to be changed.2. The circuit of claim 1 , wherein the first node is the first terminal.3. The circuit according to claim 1 , wherein the first accelerating element is coupled with a first terminal to the control terminal of the switching element and is configured to temporarily charge or discharge the control terminal when a switching state of the switching element is to be changed; andwherein a second accelerating element is coupled with a first terminal to the control terminal of the switching element and is configured to temporarily charge or discharge the control terminal when a switching state of the switching element is to be changed.4. The circuit according to claim 1 , wherein the first accelerating element is coupled with a first terminal to the control terminal of the switching element and is configured to temporarily charge or discharge the control terminal when a switching state of the switching element is to be changed.5. The circuit according to claim 1 , wherein a first device ...

CONTROL METHOD AND DEVICE EMPLOYING PRIMARY SIDE REGULATION IN A QUASI-RESONANT AC/DC FLYBACK CONVERTER WITHOUT ANALOG DIVIDER AND LINE-SENSING

A primary-side controlled high power factor, low total harmonic distortion, quasi resonant converter converts an AC mains power line input to a DC output for powering a load, such as a string of LEDs. The AC mains power line input is supplied to a transformer that is controlled by a power switch. A device for controlling a power transistor of a power stage includes a shaper circuit including a first current generator configured to output a first current responsive to a bias voltage signal and to generate a reference voltage signal based on the first current. A bias circuit includes a second current generator configured to output a second current responsive to a compensation voltage signal and to generate the bias voltage based on the second current. An error detection circuit includes a third current generator configured to output a third current responsive to the reference voltage signal and to generate the compensation voltage signal based on the third current. A driver circuit has a first input configured to receive the reference voltage signal and having an output configured to drive the power transistor. 1. A device for controlling a power transistor of a power stage , comprising:a shaper circuit including a first current generator configured to receive a bias voltage signal and configured to generate a first current that is proportional to the bias voltage signal, and configured to generate a reference voltage signal based on the first current;a bias circuit including a second current generator configured to receive a compensation voltage signal and configured to output a second current responsive to the compensation voltage signal, and configured to generate the bias voltage signal based on the second current;an error detection circuit including a third current generator configured to receive the reference voltage signal and configured to output a third current responsive to the reference voltage signal, and configured to generate the compensation voltage ...

CONVERTER CIRCUIT, CORRESPONDING DEVICE AND METHOD

An embodiment circuit comprises first and second output nodes with an inductor arranged therebetween, and first and second switches coupled to opposed ends of the inductor. The switches are switchable between non-conductive and conductive states to control current flow through the inductor and produce first and second output voltages. The current intensity through the inductor is compared with at least one reference value. Switching control circuitry is coupled with the first and second switches, the first and second output nodes, and current sensing circuitry, which is configured to control the switching frequency of the first and second switches as a function of the output voltages and a comparison at the current sensing circuitry. The switching control circuitry is configured to apply FLL-FFWD processing to produce the reference values as a function of a timing signal, targeting maintaining a constant target value for the converter switching frequency. 1. A first circuit , comprising:at least one pair of output nodes, the pair of output nodes comprising a first output node and a second output node with an inductor arranged intermediate therebetween;current drive circuitry comprising a first switch and a second switch coupled to opposed ends of the inductor, the first switch and the second switch switchable between a non-conductive state and a conductive state to control current flow through the inductor and produce a first output voltage at the first output node and a second output voltage at the second output node;current sensing circuitry sensitive to a current intensity through the inductor and configured to compare the current intensity sensed with at least one reference value; and control a switching frequency of the first switch and the second switch between the non-conductive state and the conductive state as a function of the first output voltage at the first output node, the second output voltage at the second output node, and a result of comparing the ...

POWER CONVERSION DEVICE AND DC POWER DISTRIBUTION SYSTEM

A multiwinding transformer includes a primary-side winding and a plurality of secondary-side windings. A primary-side bridge circuit is connected between a primary-side DC terminal and the primary-side winding. A plurality of secondary-side bridge circuits are connected between the plurality of secondary-side windings and a plurality of secondary-side DC terminals, respectively. A switching converter variably controls a first DC voltage of the primary-side DC terminal or a second DC voltage of a first secondary-side DC terminal among the plurality of secondary-side DC terminals such that a voltage ratio between the first DC voltage and the second DC voltage is controlled to a constant ratio in accordance with a turns ratio between the primary-side winding and the secondary-side winding corresponding to the first secondary-side DC terminal among the plurality of secondary-side windings. 1. A power conversion device comprising:a multiwinding transformer including a primary-side winding and a plurality of secondary-side windings;a primary-side DC terminal supplied with DC power from a DC power supply;a plurality of secondary-side DC terminals;a primary-side bridge circuit connected between the primary-side DC terminal and the primary-side winding, the primary-side bridge circuit carrying out DC/AC power conversion;a plurality of secondary-side bridge circuits connected between the plurality of secondary-side windings and the plurality of secondary-side DC terminals, respectively, the plurality of secondary-side bridge circuits carrying out AC/DC power conversion, a first secondary-side DC terminal electrically connected to a first secondary-side winding of the plurality of secondary-side windings with a first secondary-side bridge circuit of the plurality of secondary-side bridge circuits being interposed, and', 'a second secondary-side DC terminal electrically connected to a second secondary-side winding of the plurality of secondary-side windings with a second ...

Wide-Input-Range Downhole Power Supply

A power supply can regulate the power from a wide-input power source. The power supply can provide regulated voltage and current and can work in either a constant-current mode or a constant-voltage mode. The power supply includes a switchable charging path and a switchable discharging path, each coupled to the output in series with a current sensor and in parallel with a voltage sensor, wherein the current sensor and voltage sensor provide signals to a control circuit for controlling the switchable charging path and the switchable discharging path. The power supply can rapidly and dynamically switch between a charging state, a freewheeling state, and a discharging state. 1. A power supply comprising:a switchable charging path couplable to a power source;a switchable discharging path;an output coupled to the switchable charging path and the switchable discharging path;a current sensor coupled to the output for providing a current signal indicative of current being provided through the output;a voltage sensor coupled to the output for providing a voltage signal indicative of voltage being provided through the output; anda control circuit coupled to the current sensor and the voltage sensor for controlling the switchable charging path and the switchable discharging path in response to receiving the current signal and the voltage signal.2. The power supply of claim 1 , further comprising:a current storage element coupled in series with the current sensor and the output; anda voltage storage element coupled in parallel with the voltage sensor and the output.3. The power supply of claim 1 , wherein the control circuit comprises:a high-side driver for controlling a transistor of the switchable charging path;a low-side driver for controlling a second transistor of the switchable discharging path;a first comparator coupled to the current sensor for controlling the high-side driver and the low-side driver in response to the current signal exceeding either or an upper current ...

Active-matrix substrate, display panel and display device including the same

A technique is provided that reduces dullness of a potential provided to a line such as gate line on an active-matrix substrate to enable driving the line at high speed and, at the same time, reduces the size of the picture frame region. On an active-matrix substrate ( 20 a ) are provided gate lines ( 13 G) and source lines. On the active-matrix substrate ( 20 a ) are further provided: gate drivers ( 11 ) each including a plurality of switching elements, at least one of which is located in a pixel region, for supplying a scan signal to a gate line ( 13 G); and lines ( 15 L 1 ) each for supplying a control signal to the associated gate driver ( 11 ). A control signal is supplied by a display control circuit ( 4 ) located outside the display region to the gate drivers ( 11 ) via the lines ( 15 L 1 ). In response to a control signal supplied, each gate driver ( 11 ) drives the gate line ( 13 G) to which it is connected.

POWER SUPPLY CIRCUIT AND CONTROL METHOD FOR THE SAME

According to one embodiment, a power supply circuit is adapted to turn on a switching transistor connected between an input terminal and an output node and supply current via an inductor to a capacitor connected to the output node, so as to obtain an output voltage from an output terminal connected to the capacitor. A detection signal according to current flowing in the inductor or a detection signal according to a comparison result between the output voltage and a reference voltage are detected at a predetermined time, and an ON-time of the transistor is controlled in accordance with the detection signal. 1. A power supply circuit comprising:an input terminal to which an input voltage is applied;an output node;a switching transistor that is connected between the input terminal and the output node;an inductor whose one end is connected to the output node;a first output terminal that is connected to another end of the inductor;a capacitor that is connected to the first output terminal, the capacitor being charged with current flowing in the inductor; anda control circuit that includes at least one of a first detection circuit configured to detect a first detection signal according to a state of the current flowing in the inductor and a second detection circuit configured to detect a second detection signal according to a result of comparison of a voltage at the first output terminal with a first reference voltage, the control circuit controlling an ON-time during which the switching transistor is turned on according to the first or second detection signal.2. The power supply circuit according to claim 1 , further comprising a plurality of the output terminals and a plurality of the capacitors claim 1 , the output terminals being connected respectively with the capacitors and connected time-divisionally to the other end of the inductor.3. The power supply circuit according to claim 1 , further comprising a first comparison circuit that compares a voltage at the output ...

Isolated multi-level resonant toplogies for wide-range power conversion and impedance matching

Resonant power converters that replace the conventional impedance matching stage with series or parallel connections between resonant inverters and resonant rectifiers are provided. Two or more resonant rectifiers can be connected in series or in parallel to the resonant inverter to provide impedance matching. Similarly, two or more resonant inverters can be connected in series or in parallel to the resonant rectifier to provide impedance matching. Electrical isolation of DC voltage between input and output is provided using only capacitors. 1. A DC to DC electric power converter comprising:{'sub': out', 'out, 'a resonant power inverter configured to receive a DC input and to provide an AC output having a frequency f, wherein an output impedance of the power inverter is Z;'}{'sub': 'out', 'two or more resonant rectifier circuits directly connected to the AC output provided by the power inverter, wherein the resonant rectifier circuits are tuned to operate resonantly at f, and wherein the resonant rectifier circuits are each configured to receive the AC output and to provide a DC output;'}wherein electrical isolation between the DC input and the DC outputs is provided exclusively with capacitors; andwherein impedance matching is provided either by parallel connections of the resonant rectifier circuits to the power inverter or by series connections of the resonant rectifier circuits to the power inverter.2. The DC to DC electric power converter of claim 1 , wherein each of the resonant rectifier circuits has an input impedance at fof Z.3. The DC to DC electric power converter of claim 2 , wherein N resonant rectifier circuits are connected to the power inverter in parallel claim 2 , and wherein Zis about Z/N.4. The DC to DC electric power converter of claim 2 , wherein N resonant rectifier circuits are connected to the power inverter in series claim 2 , and wherein Zis about NZ.5. The DC to DC electric power converter of claim 1 , wherein the impedance matching is ...

High Power Factor Power Converters with Adaptive Output Voltage Limits for Fast Dynamic Load Response

A switching power converter is provided that switches between low-bandwidth PI control and a high-speed control of an output voltage responsive to comparing the output voltage to an upper output voltage limit and to a lower output voltage limit. The switching power converter adapts the upper and lower voltage limits responsive to a load demand. 1. A circuit; comprising:a proportional-integral (PI) controller;an upper output voltage limit adaptation circuit configured to adapt an upper output voltage limit responsive to a load demand;a lower output voltage limit adaptation circuit configured to adapt a lower output voltage limit responsive to the load demand; anda mode control circuit configured to allow the PI controller to control the cycling of a power switch when an output voltage is both less than the upper output voltage limit and greater than the lower output voltage limit and to prevent the PI controller from controlling the cycling the power switch when the output voltage is greater than the upper output voltage limit or less than the lower output voltage limit.2. The circuit of claim 1 , wherein the PI controller is a peak-current-mode controller.3. The circuit of claim 1 , wherein the PI controller is a constant on time controller.4. The circuit of claim 2 , wherein the upper output voltage limit adaptation circuit is configured to adapt the upper output voltage limit responsive to the load demand through the use of a percentage of an output voltage ripple for the output voltage claim 2 , and wherein the upper output voltage limit adaptation circuit is further configured to add the percentage to a peak value for the output voltage to adapt the upper output voltage limit.5. The circuit of claim 2 , wherein the lower output voltage limit adaptation circuit is configured to adapt the lower output voltage limit responsive to the load demand through the use of a percentage of an output voltage ripple for the output voltage claim 2 , and wherein the lower output ...

SWITCHING POWER SUPPLY

A switching power supply includes a main switching element that is connected to a primary coil of a transformer and switches a main current ON/OFF, and a secondary switching element connected in parallel to the main switching element and that has a lower power capacity than the main switching element. The switching power supply also includes a control circuit that controls these switching elements. The control circuit includes: a main driver circuit that generates, in accordance with a control signal generated according to an output voltage from a secondary coil of the transformer, a main drive signal for switching the main switching element ON/OFF; a secondary driver circuit that generates a secondary drive signal for switching the secondary switching element ON/OFF according to the control signal; and an enable control circuit that deactivates the main driver circuit when a power consumption of a load is less than a threshold value. 1. A switching power supply , comprising:a main switching element, configured to be attached to a primary coil of a transformer so as to switch a main current that flows in the primary coil ON and OFF;a control circuit that controls switching the main switching element ON and OFF according to an output voltage obtained via a secondary coil of the transformer; anda secondary switching element that has a lower power capacity than the main switching element, the secondary switching element being connected in parallel to the main switching element and being switched ON and OFF by the control circuit, a main driver circuit that generates, based upon the output voltage, a main drive signal for switching the main switching element ON and OFF;', 'a secondary driver circuit that generates a secondary drive signal for switching the secondary switching element ON and OFF based upon the output voltage; and', 'an enable control circuit that activates the main driver circuit when a power consumption of a load to which the output voltage is supplied ...

POWER CONVERSION DEVICE AND DRIVE DEVICE

To reduce the number of mounted components in the power conversion device and drive device. 1. A power conversion device comprising:a high-side transistor including an IGBT;a low-side transistor including an IGBT, and having a collector coupled to an emitter of the high-side transistor;a high-side driver configured to drive the high-side transistor; anda low-side driver configured to drive the low-side transistor,wherein each of the high-side transistor and the low-side transistor includes:a first trench gate electrode arranged in an active cell region, and electrically connected to a gate; anda second trench gate electrode and a third trench gate electrode, each of which is arranged at intervals on both sides of the first trench gate electrode, and electrically connected to the emitter in the active cell region,wherein the high-side driver includes:a first pull-up transistor configured to apply a first voltage as a positive voltage to the gate, based on the emitter of the high-side transistor; anda first pull-down transistor configured to couple the gate of the high-side transistor to the emitter, andwherein the low-side driver includes:a second pull-up transistor configured to apply a second voltage as a positive voltage to the gate, based on the emitter of the low-side transistor; anda second pull-down transistor configured to couple the gate of the low-side transistor to the emitter.2. The power conversion device according to claim 1 , further comprising:a transformer including a primary coil, and a first secondary coil and a second secondary coil;an AC voltage generation circuit configured to generate an AC voltage, and apply the AC voltage to the primary coil;a first rectifier circuit configured to rectify an AC voltage generated by the first secondary coil, and generate the first voltage in a first node based on a first reference node; anda second rectifier circuit configured to rectify an AC voltage generated by the second secondary coil, and generate the ...

Winding Module, Hybrid Transformer, Module and Circuit for DC-DC Power Conversion

In an embodiment, a DC-DC power conversion circuit with a step-down conversion ratio of at least 12:1 is provided. The DC-DC power conversion circuit includes a half-bridge circuit arrangement, a resonant capacitor and a module including a hybrid transformer. The hybrid transformer includes a magnetic core and a primary winding electrically coupled in series with a secondary winding. The module further includes a synchronous rectifier having an output coupled between the primary winding and the secondary winding of the hybrid transformer, and an output capacitor coupled with an output of the secondary winding. 1. A winding module for a hybrid transformer , comprising:a primary winding electrically coupled in series with a secondary winding,wherein the primary winding comprises a first conductive trace arranged on a planar support and the secondary winding comprises a second conductive trace arranged on the planar support,wherein the first conductive trace and the second conductive trace are arranged in a stack,wherein the planar support comprises an aperture configured to accept a magnetic core.2. The winding module of claim 1 , wherein the primary winding comprises a plurality of conductive primary layers and the secondary winding comprises a plurality of conductive secondary layers claim 1 , the conductive primary layers and the conductive secondary layers being arranged on the planar support in a stack claim 1 , and wherein the conductive primary layers each comprise a planar spiral with at least one turn.3. The winding module of claim 2 , wherein the conductive secondary layers are coupled in parallel by a common conductive via extending substantially perpendicularly to the planar support and the planar spirals are coupled in series by one or more conductive vias extending between adjacent ones of the planar spirals.4. The winding module of claim 2 , wherein an outer end of a first planar spiral is vertically aligned with an outer end of a second planar spiral ...

ELECTRONIC SYSTEM

An electronic system includes a plurality of switching elements (T) and a plurality of energy storage elements (L; C). The energy storage elements (L; C) are connected to one another by the switching elements (T). The energy storage elements (L; C) can be selectively switched to a first, a second or a third state by switching the switching elements (T). In the first state, the energy storage elements (L; C) are connected in series with one another. In the second state, the energy storage elements (L; C) are connected in parallel with one another. In the third state, the energy storage elements (L; C) are bypassed, wherein two of the energy storage elements (L; C) are each connected by no more than three of the switching elements (T). 1. An electronic system comprising a plurality of switching elements (T) and a plurality of energy storage elements (L; C) ,wherein the energy storage elements (L; C) are connected to one another by the switching elements (T),wherein the energy storage elements (L; C) are configured to be selectively switched to a first, a second or a third state by switching the switching elements (T),wherein, in the first state, the energy storage elements (L; C) are connected in series with one another,wherein, in the second state, the energy storage elements (L; C) are connected in parallel with one another, andwherein, in the third state, the energy storage elements (L; C) are bypassed,wherein two of the energy storage elements (L; C) are each connected by no more than three of the switching elements (T).2. The electronic system as claimed in claim 1 , wherein the electronic system is embodied as a converter.3. The electronic system as claimed in claim 1 , wherein the switching elements (T) and the energy storage elements (L; C) are configured to be connected to one another in a modular manner.4. The electronic system as claimed in claim 1 , wherein the system comprises a control element claim 1 , which is configured to switch the switching ...

RECTIFIER WITH INDICATOR SWITCH

This relates to a rectifier with indicator switch circuit that may be used in a power conversion system. The rectifier with indicator switch circuit may be configured to rectify an ac line voltage and output an indicator signal that is representative of a fault condition in the ac line voltage. The rectifier with indicator switch circuit may include a storage capacitor configured to be charged by the ac line voltage during a first half-cycle of the ac line voltage and a detection capacitor configured to be charged by the storage capacitor during a second half-cycle of the ac line voltage. A switch coupled to the detection capacitor may be configured to generate the indicator signal based on a voltage across the detection capacitor. The indicator signal may be provided to a controller to disable operation of the power conversion system in response to the detection of a fault condition 1. A rectifier circuit comprising:an input to be coupled to receive an alternating current (ac) input voltage;a full-wave bridge rectifier coupled to the input and configured to rectify the ac input voltage to output a rectified ac input voltage;a high-impedance circuit comprising an impedance element coupled to the input, wherein the impedance element is configured to be charged by the ac input voltage during at least a portion of a first half-cycle of the ac input voltage;a detection capacitor coupled to be charged by the impedance element during at least a portion of a second half-cycle of the ac input voltage; anda transistor coupled to the detection capacitor and configured to switch between an ON state and an OFF state to generate an indicator signal representative of a fault condition in the ac input voltage based on a voltage across the detection capacitor.2. The rectifier circuit of claim 1 , wherein the transistor is configured to switch to the ON state in response to the voltage across the detection capacitor decreasing below a detection threshold voltage.3. The rectifier ...

SYSTEMS AND METHODS FOR REGULATING POWER CONVERSION SYSTEMS WITH OUTPUT DETECTION AND SYNCHRONIZED RECTIFYING MECHANISMS

System controller and method for regulating a power converter. For example, the system controller includes a first controller terminal and a second controller terminal. The system controller is configured to receive an input signal at the first controller terminal and generate a drive signal at the second controller terminal based at least in part on the input signal to turn on or off a transistor in order to affect a current associated with a secondary winding of the power converter. Additionally, the system controller is further configured to determine whether the input signal remains larger than a first threshold for a first time period that is equal to or longer than a first predetermined duration. 1. A system controller for regulating a power converter , the system controller comprising:a first controller terminal; anda second controller terminal; receive an input signal at the first controller terminal; and', 'generate a drive signal at the second controller terminal based at least in part on the input signal to turn on or off a transistor in order to affect a current associated with a secondary winding of the power converter;, 'wherein the system controller is configured to determine whether the input signal remains larger than a first threshold for a first time period that is equal to or longer than a first predetermined duration; and', 'in response to the input signal not being determined to remain larger than the first threshold for the first time period that is equal to or longer than the first predetermined duration, operate with a first mechanism;, 'wherein the system controller is further configured to determine whether the input signal remains smaller than a second threshold for a second time period that is equal to or longer than a second predetermined duration; and', 'in response to the input signal being determined to remain smaller than the second threshold for the second time period that is equal to or longer than the second predetermined ...

INSULATED DC/DC CONVERTER AND PRIMARY SIDE CONTROLLER THEREOF, CONTROL METHOD, AND POWER ADAPTOR AND ELECTRONIC DEVICE USING THE SAME

A primary side controller for controlling a switching transistor on a primary side of an insulated DC/DC converter, includes: a low voltage state detecting circuit configured to detect a low voltage state in which an output voltage of the DC/DC converter is lower than a predetermined value; and a pulse width modulator configured to generate a pulse signal whose ON time is adjusted depending on a feedback signal from a secondary side, wherein a period of the pulse signal in the low voltage state is longer than a period of the pulse signal in a non-low voltage state in which the output voltage is higher than the predetermined value. 1. A primary side controller for controlling a switching transistor on a primary side of an insulated DC/DC converter , comprising:a low voltage state detecting circuit configured to detect a low voltage state in which an output voltage of the DC/DC converter is lower than a predetermined value; anda pulse width modulator configured to generate a pulse signal having an ON time which is adjusted depending on a feedback signal from a secondary side of the insulated DC/DC converter,wherein a period of the pulse signal in the low voltage state is longer than a period of the pulse signal in a non-low voltage state in which the output voltage is higher than the predetermined value.2. A primary side controller for controlling a switching transistor on a primary side of an insulated DC/DC converter , comprising:a low voltage state detecting circuit configured to detect a low voltage state in which an output voltage of the DC/DC converter is lower than a predetermined value; anda pulse width modulator configured to generate a pulse signal having an ON time which is adjusted depending on a feedback signal from a secondary side of the insulated DC/DC converter,wherein an OFF time of the pulse signal in the low voltage state is longer than an OFF time of the pulse signal in a non-low voltage state in which the output voltage is higher than the ...

EFFICIENT NANOSECOND PULSER WITH SOURCE AND SINK CAPABILITY FOR PLASMA CONTROL APPLICATIONS

Some embodiments include a high voltage, high frequency switching circuit. In some embodiments, the high voltage, high frequency switching circuit includes a high voltage switching power supply that produces pulses having a voltage greater than 1 kV and with frequencies greater than 10 kHz; a transformer having a primary side and secondary side; an output electrically coupled with the secondary side of the transformer; and a primary sink electrically coupled with the primary side of the transformer and in parallel with the high voltage switching power supply, the primary sink comprising at least one resistor that discharges a load coupled with the output, 1. A high voltage , high frequency switching circuit comprising:a high voltage switching power supply that produces pulses having a voltage greater than 1 kV and with frequencies greater than 10 kHz;a transformer having a primary side and secondary side;an output electrically coupled with the secondary side of the transformer; anda primary sink electrically coupled with the primary side of the transformer and in parallel with the high voltage switching power supply, the primary sink comprising at least one resistor that discharges a load coupled with the output.2. The high voltage claim 1 , high frequency switching circuit according to claim 1 , wherein the primary sink is configured to dissipate over about 1 kilowatt of average power.3. The high voltage claim 1 , high frequency switching circuit according to claim 1 , wherein the primary sink comprises at least on inductor in series with the at least one resistor.4. The high voltage claim 1 , high frequency switching circuit according to claim 1 , wherein the primary sink comprises a switch in series with the at least one resistor.5. The high voltage claim 1 , high frequency switching circuit according to claim 1 , wherein the output is coupled with a plasma load that is largely capacitive.6. The high voltage claim 1 , high frequency switching circuit according to ...

METHOD OF MANUFACTURING SEMICONDUCTOR INTEGRATED CIRCUIT

A method of manufacturing a semiconductor integrated circuit includes a first ion implantation process implanting impurity ions of a second conductivity type into a bottom surface of a semiconductor substrate by adjusting an acceleration voltage and a projection range for forming a first current suppression layer, and a second ion implantation process implanting impurity ions of a first conductivity type into the bottom surface of the semiconductor substrate by adjusting an acceleration voltage and a projection range for forming a second current suppression layer. The semiconductor integrated circuit includes a first well region of the first conductivity type and a second well region of the second conductivity type provided in an upper portion of the first well region. The first current suppression layer is separated from the first well region and the second current suppression layer is provided under the first current suppression layer. 1. A method of manufacturing a semiconductor integrated circuit including a first well region of a first conductivity type , a second well region of a second conductivity type provided in an upper portion of the first well region , a first current suppression layer of the second conductivity type being provided in a lower portion of a semiconductor substrate of the second conductivity type , the first current suppression layer is disposed directly under the first well region being separated from the first well region and having an impurity concentration higher than that of the semiconductor substrate , and a second current suppression layer of the first conductivity type provided under the first current suppression layer , the second current suppression layer is exposed from a bottom surface of the semiconductor substrate , the method comprising:a first ion implantation process implanting impurity ions of the second conductivity type into the bottom surface of the semiconductor substrate by adjusting an acceleration voltage and a ...

POWER CONVERSION APPARATUS AND SYNCHRONOUS RECTIFICATION CIRCUIT THEREOF

A power conversion apparatus and a synchronous rectification (SR) circuit thereof are provided. The power conversion apparatus includes a transformer and the SR circuit. A primary winding of the transformer receives an input voltage. A secondary winding of the transformer provides an output voltage to an output terminal. The SR circuit includes a SR transistor and a SR controller. The SR transistor is coupled between the secondary winding and the output terminal and controlled by a control signal. The SR controller is coupled to the SR transistor to receive a first detecting signal, and generates the control signal according to the first detecting signal. When the SR controller detects that the SR circuit is abnormal, the SR controller generates the controller signal to keep the SR transistor at an on state so as to perform an abnormal protection on the SR circuit. 1. A power conversion apparatus , comprising:a transformer, comprising a primary winding and a secondary winding, wherein the primary winding receives an input voltage, and the secondary winding provides an output voltage to an output terminal; and a synchronous rectification transistor, coupled between the secondary winding and the output terminal and controlled by a control signal; and', 'a synchronous rectification controller, coupled to the synchronous rectification transistor to receive a first detecting signal, and generating the control signal according to the first detecting signal so as to turn on/off the synchronous rectification transistor,, 'a synchronous rectification circuit, comprisingwherein when the synchronous rectification controller detects that an abnormal event occurs on the synchronous rectification circuit, the synchronous rectification controller generates the control signal to keep the synchronous rectification transistor in an on state so as to perform abnormal protection on the synchronous rectification circuit, an anomaly detecting circuit, receiving an external detecting ...

Compensation Ramp Offset Removal

A DC-DC current-control mode switching converter is disclosed, with peak-mode control circuitry, configured to compare a coil current to a variable current limit, to turn off a high side device when the coil current exceeds the variable current limit. The DC-DC switching converter includes a compensation ramp generator, configured to provide a compensation ramp signal, and an offset circuit, configured to provide an offset current. The DC-DC switching converter further includes an amplifier, configured to generate a control current proportional to the difference between an output voltage and a target voltage, and an adder, to combine the control current, the compensation ramp signal, and the offset current. A DC-DC current-control mode switching converter, with valley-mode control circuitry, configured to compare a coil current to a variable current limit, to turn off a low side device when the coil current falls below the variable current limit, is also disclosed. 1. A DC-DC current-control mode switching converter , comprising:peak-mode control circuitry, configured to compare a coil current to a variable current limit, to turn off a high side device when said coil current exceeds said variable current limit;a compensation ramp generator, configured to provide a compensation ramp signal, wherein a current mirror is connected to said compensation ramp generator;an offset circuit, configured to provide an offset current;an amplifier, configured to generate a control current proportional to the difference between an output voltage and a target voltage; andan adder, to combine said control current, said compensation ramp signal, and said offset current.2. (canceled)3. The switching converter of claim 1 , wherein said current mirror is configured to provide a replica of said compensation ramp signal.4. The switching converter of claim 1 , wherein said offset circuit comprises a sampling circuit claim 1 , configured to sample said compensation ramp signal when said high ...

DC-DC CONVERTER AND LOAD-DRIVING SEMICONDUCTOR INTEGRATED CIRCUIT

A DC-DC converter, which allows a current to pass through an inductor and rectifies the current through the inductor to convert an input direct current voltage supplied from a direct current power unit into a direct current voltage at a different potential and output the direct current voltage, includes a switching control circuit performing peak-current control procedures including turning on the switching element when the converted direct current voltage drops to a predetermined potential and turning off the switching element when the current through the inductor reaches a predetermined value. The converter includes a copied-current generating circuit generating a current proportional to the output current. The switching control circuit turns off the switching element when the circuit detects that the current through the inductor reaches a predetermined value with reference to a combined current of the copied current generated at the copied-current generating circuit and a predetermined reference current. 1. A DC-DC converter that turns on or off a switching element which allows a current to pass through an inductor and rectifies the current through the inductor to convert an input direct current voltage supplied from a direct current power unit into a direct current voltage at a different potential and output the direct current voltage , the converter comprising:a switching control circuit performing peak-current control procedures comprising turning on the switching element when the converted direct current voltage drops to a predetermined potential and turning off the switching element when the current through the inductor reaches a predetermined value; anda copied-current generating circuit generating a copied current proportional to the output current,wherein the switching control circuit turns off the switching element when the switching control circuit detects that the current through the inductor reaches a predetermined value with reference to a combined ...

GATE DRIVER AND POWER CONVERTER

A gate driver for driving a gate of a switching element in accordance with an input signal is provided. The gate driver is configured to change a gate driving condition in accordance with a detected value of power supply voltage. Each time when the switching element is turned off, the gate driver stores a time width from a time when the input signal is switched to an off command to a time when switch-off surge occurs in the switching device. If it is determined that the gate driving condition should be changed during turn-off operation of the switching element, the gate driver switches the gate driving condition when a time corresponding to the time width stored at a previous turn-off is elapsed after a current turn-off of the switching element is started. 1. A gate driver comprising:a drive circuit configured to drive a gate of a switching element connected between a high electric potential output of a power supply and a low electric potential output of the power supply, in accordance with an input signal indicating a command to turn on or to turn off the switching element;a switch-off surge detection circuit configured to detect switch-off surge that occurs in the switching element;a time storing circuit configured to store a time width from a time when the input signal is switched to a command to turn off the switching element to a time when the switch-off surge detection circuit detects occurrence of the switch-off surge;a switching determination circuit configured to determine whether or not to switch a gate driving condition of the switching element, in accordance with a detected value of power supply voltage, the power supply voltage being a potential difference between the high electric potential output of the power supply and the low electric potential output of the power supply; anda driving condition switching circuit configured to switch the gate driving condition in response to a determination by the switching determination circuit to switch the gate ...

POWER SUPPLY CONTROL DEVICE AND POWER SUPPLY CONTROL METHOD

A power supply control device includes a switch control unit configured to control ON/OFF of a switching device of a boost chopper by using an oscillation wave, a comparison voltage generating unit configured to charge or discharge comparison capacitor that generates a comparison voltage for comparison with the oscillation wave in correspondence with a DC output voltage outputted from the boost chopper, an input increase detecting unit configured to detect whether a detection value corresponding to current flowing through the boost chopper has increased to or above a detection criterion, an output voltage detecting unit configured to detect whether the DC output voltage is at or above the lower limit voltage, a discharging unit configured to discharge the comparison capacitor when the detection value has increased to or above the detection criterion and the DC output voltage is at or above the lower limit voltage. 1. A power supply control device comprising:a switch control unit configured to control ON/OFF of a switching device of a boost chopper by using an oscillation wave,a comparison voltage generating unit configured to charge or discharge comparison capacitor that generates a comparison voltage for comparison with the oscillation wave in correspondence with a DC output voltage outputted from the boost chopper,an input increase detecting unit configured to detect whether a detection value corresponding to current flowing through the boost chopper has increased to or above a detection criterion,an output voltage detecting unit configured to detect whether the DC output voltage is at or above a lower limit voltage, anda discharging unit configured to discharge the comparison capacitor when the detection value has increased to or above the detection criterion and the DC output voltage is at or above the lower limit voltage.2. The power supply control device according to claim 1 , wherein the input increase detecting unit comprising:a sampling circuit configured ...

HALF-BRIDGE DRIVER CIRCUIT

First and second FETs of a half-bridge are series connected between first and second terminals and are gate driven, respectively, by first and second drivers. An inductance is connected to the intermediate node of the half-bridge. Power supply for the second driver circuit is a supply voltage generated by a voltage regulator as a function of the voltage between the first and the second terminal. Power supply for the first driver circuit is a supply voltage generated by a bootstrap capacitor having a first terminal connected via a first switch to receive the supply voltage output from the voltage regulator and a second terminal connected to the intermediate node. The first terminal of the bootstrap capacitor is further connected by a second switch to receive a second supply voltage. A control circuit generates control signals for the first and second driver circuits and the first and second switches. 1. A half-bridge circuit , comprising:a first, a second and a third terminal;a half-bridge comprising a first and a second n-channel FET connected in series between said first and said second terminal, wherein an intermediate node between said first n-channel FET and said second n-channel FET is a switching node;an inductance connected between said switching node and said third terminal;a first driver circuit configured to drive a gate terminal of said first n-channel FET as a function of a first drive signal;a second driver circuit configured to drive a gate terminal of said second n-channel FET as a function of a second drive signal;a voltage regulator configured to generate at an output terminal a first supply voltage as a function of the voltage between said first and second terminals, wherein said first supply voltage is used to power supply said second driver circuit; and close said first n-channel FET and open said second n-channel FET during a first time interval;', 'open said first n-channel FET and close said second n-channel FET during a second time interval; ...

INPUT POWER SUPPLY SELECTION CIRCUIT

An input power supply selection circuit includes a load, at least one input power supply to provide an operation power supply for the load, an input selection circuit to select the at least one input power supply as the operation power supply for the load, a sensing and control module to control the input selection circuit to switch the operation power supply for the load, and a load switch branch to control the load to be connected or disconnected. The sensing and control module controls the load switch branch to be connected or disconnected, and when the load switch branch is disconnected, the load and the at least one input power supply are not electrically coupled. Therefore, a contact protection design is simplified and a switching capacity requirement of the load switch branch is lowered. 1. An input power supply selection circuit comprising:a load;at least one input power supply to provide an operation power supply for the load, the operation power supply being a direct current power supply or an alternating current power supply;an input selection circuit to select the at least one input power supply as the operation power supply for the load; anda sensing and control module to control the input selection circuit to switch the operation power supply for the load; whereinthe input power supply selection circuit further comprises a load switch branch to control the load to be connected or disconnected, the load switch branch including a first end and a second end, the first end being connected with the load, the second end being connected with an output end of the input selection circuit; andthe sensing and control module controls the load switch branch to be connected or disconnected, and when the load switch branch is disconnected, the load and the at least one input power supply are not electrically coupled.2. The input power supply selection circuit according to claim 1 , wherein the sensing and control module determines whether the operation power supply ...

SWITCHING REGULATOR AND POWER SWITCH CONTROLLER CIRCUIT THEREOF

A switching regulator includes a power stage circuit, an auxiliary winding, a start-up switch, and a power switch controller circuit. The power switch controller circuit includes a multifunction pin, a start-up controller circuit, and a feedback compensation circuit. The multifunction pin is coupled to a control terminal of the start-up switch, to deliver different signals with different functions under at least two different modes, respectively. The start-up controller circuit generates a start-up signal in a start-up mode, wherein the start-up signal is delivered to a control terminal of the start-up switch through the multifunction pin. An output terminal of the feedback compensation circuit is coupled to the multifunction pin, to provide a compensation signal at the multifunction pin in an operation mode. 1. A switching regulator , comprising:a power stage circuit, including an inductor and at least one power switch; wherein the least one power switch is coupled to the inductor and is configured to operate according to a switch control signal, to control a conduction status of the inductor, thereby converting an input power to an output power;an auxiliary winding, wherein the auxiliary winding and the inductor form a transformer, to generate a controller supply voltage;a start-up switch coupled between an input voltage related signal and the controller supply voltage, wherein the input voltage related signal is related to an input voltage of the input power; and a multifunction pin, which is coupled to a control terminal of the start-up switch and which is configured to operably deliver different signals with different functions under at least two different modes, respectively;', 'a start-up controller circuit, which is coupled to a control terminal of the start-up switch via the multifunction pin and which is configured to operably generate a start-up signal under a start-up mode, wherein the start-up signal is delivered to the control terminal of the start-up ...

POWER CONVERSION DEVICE

A control circuit converts power by controlling a phase difference between a switching phase of a plurality of switching elements of a first bridge circuit and a switching phase of a plurality of switching elements of a second bridge circuit such that the control circuit controls the phase difference to be smaller to reduce the output power. When the phase difference reaches a predefined lower limit value in a step-down mode of stepping down the input power, the control circuit controls an on-time of the plurality of switching elements of the second bridge circuit to be shorter while the phase difference is fixed at the lower limit value. 1. A power conversion device comprising:a first bridge circuit that includes a plurality of switching elements and supplies an output power to a load;a second bridge circuit that includes a plurality of switching elements and receives an input power from a DC power supply;an insulated transformer connected between the first bridge circuit and the second bridge circuit; anda control circuit that controls the plurality of switching elements of the first bridge circuit and the plurality of switching elements of the second bridge circuit, whereinthe control circuitconverts power by controlling a phase difference between a switching phase of the plurality of switching elements of the first bridge circuit and a switching phase of the plurality of switching elements of the second bridge circuit such that the control circuit controls the phase difference to be smaller to reduce the output power, andwhen the phase difference reaches a predefined lower limit value in a step-down mode of stepping down the input power, the control circuit controls an on-time of the plurality of switching elements of the second bridge circuit to be shorter while the phase difference is fixed at the lower limit value.2. The power conversion device according to claim 1 , whereinwhen the phase difference reaches the lower limit value in the step-down mode of ...

SEMICONDUCTOR DEVICE AND POWER CONVERTER EQUIPMENT

A semiconductor device that has a level shift circuit, an anterior stage circuit, and a posterior stage circuit. The level shift circuit transmits an input signal from a primary potential system to a secondary potential system different from the primary potential system. The anterior stage circuit including a first transistor receives a gate driving signal delivered by the level shift circuit. The posterior stage circuit including a second transistor with the same channel type as that of the first transistor drives a switching element according to the output signal from the first transistor. The threshold voltage of the first transistor is set at a lower value than the threshold voltage of the second transistor.

SIGNAL TRANSMISSION CIRCUIT AND POWER CONVERSION DEVICE EQUIPPED WITH SAME

A signal transmission circuit () includes, in each of a first circuit () connected to a first coil () of an insulating transformer () and a second circuit () connected to a second coil () of the insulating transformer (), a transmitting circuit (), a receiving circuit (), a coil-side switching circuit (), an input/output-side switching circuit (), an abnormality detection circuit (), a delay circuit (), and a direction control section (). In the signal transmission circuit (), the direction control section () controls the switching circuit () to switch a signal direction between input and output, and the switching circuit () switches between transmission and reception. The delay circuit () delays a received signal and returns the resultant signal to the transmitting side, and the abnormality detection circuit () detects abnormality to perform self-diagnosis. 1. A signal transmission circuit comprising:an insulating transformer including a first coil and a second coil;a first circuit connected to the first coil; anda second circuit connected to the second coil, the signal transmission circuit transmitting a first input signal inputted to the first circuit and outputting the transmitted signal as a second output signal from the second circuit, wherein a first transmitting circuit for generating and outputting a transmission signal to the first coil in accordance with change in a logical value of an inputted signal A;', 'a first receiving circuit for receiving a signal from the first coil, demodulating the signal into a binary signal having a logical value, and outputting the binary signal;', 'a first switching circuit for switching a connection destination of the first coil between the first transmitting circuit and the first receiving circuit; and', 'a first abnormality detection circuit for comparing the output signal from the first receiving circuit with the signal A to be inputted to the first transmitting circuit, to detect abnormality, and outputting a first ...

SIGNAL GENERATOR AND PFC CONVERTER USING THE SAME

Disclosed herein are a signal generator having high efficiency and a PFC converter using the same. According to an exemplary embodiment of the present disclosure, a PFC converter includes: a converter unit including an inductor and a switch which switches a flow of driving current in the inductor by a turn on or turn off operation; and a signal generator outputting a turn on signal or a turn off signal switching the switch and when a magnitude of the driving current is smaller than a preset value, keeping the turn on signal long to enable the magnitude of the driving current to reach the preset value. 1. A PFC converter , comprising:a converter unit including an inductor and a switch which switches a flow of driving current in the inductor by a turn on or turn off operation; anda signal generator outputting a turn on signal or a turn off signal switching the switch and when a magnitude of the driving current is smaller than a preset value, keeping the turn on signal long to enable the magnitude of the driving current to reach the preset value.2. The PFC converter according to claim 1 , wherein the signal generator includes an on signal generator which generates an on trigger signal by a sensing voltage sensing the driving current and a feedback voltage corresponding to an output voltage of the converter unit and an off signal generator which generates an off trigger signal in response to the sensing voltage claim 1 , andthe signal generator outputs the turn on signal when the on trigger signal is input and outputs the turn off signal when the off trigger signal is input.3. The PFC converter according to claim 2 , wherein the on signal generators alternately output the on trigger signals and delay and output an on trigger signal generated after the turn on signal kept long among the on trigger signals.4. The PFC converter according to claim 2 , wherein the on signal generator includes an integrator which calculates a period for which the turn on signal is kept long.5 ...

SWITCHING REGULATOR WITH CONTROLLABLE DEAD TIME AND QUICK START

A driver circuit for driving a switching transistor includes a dead time calibration circuit and/or a quick start circuit. The dead time calibration circuit includes a delay comparator to compare a present delay between the low side switch turning off or the high side switch turning off and a voltage at a switch node between the high side switch and the low side switch to a past delay and a controller responsive to the comparison is configured to adjust the delay of an adjustable delay element coupled to a control terminal of a switching transistor. The quick start circuit includes a quick start signal generator having an adjustable delay element to generate a quick start signal having a pulse to turn on the switching transistor for a quick start interval, a quick start comparator configured to monitor the quick start signal, and a control circuit responsive to the comparison by the quick start comparator to adjust the delay of the delay element. 1. A driver circuit for driving a switching transistor of a switching regulator having a low side switch and a high side switch coupled to the low side switch at a switch node , comprising:an adjustable delay element coupled between a control terminal of the high side switch and a control terminal of the low side switch and having a delay; and a delay comparator configured to compare a present delay between the low side switch or the high side switch turning off and a voltage at the switch node to a past delay between the low side switch or the high side switch turning off and the voltage at the switch node; and', 'a controller responsive to the comparison by the delay comparator to adjust the delay of the adjustable delay element., 'a dead time calibration circuit configured to calibrate a dead time between one of the low side or the high side switch turning off and the other one of the high side switch or the low side switch turning on, comprising2. The dead time calibration circuit of wherein dead time calibration ...

ENHANCED PHASE CONTROL CIRCUIT AND METHOD FOR A MULTIPHASE POWER CONVERTER

A multiphase power converter has a plurality of phase circuits, each of which provides a phase current when being active. During single-phase operation of the multiphase power converter, an enhanced phase control circuit and method monitor the summation of the phase currents, and when the summation becomes higher than a threshold, switch the multiphase power converter to a higher power zone to increase the number of active phases. A high efficiency and high reliability multiphase power converter is thus accomplished. 1. An enhanced phase control circuit for a multiphase power converter having a plurality of phase circuits , each of which is configured to operably provide a phase current when being active , a plurality of current sensors , each of which is configured to operably sense a respective one of each said phase current to generate a current sense signal , a summing circuit configured to operably combine each said current sense signal to generate a summed signal , and an error amplifier configured to operably compare a reference voltage to a feedback voltage related to an output voltage of the multiphase power converter to generate an error signal for regulating the output voltage , the enhanced phase control circuit comprising:a state machine configured to operate to switch the multiphase power converter between a plurality of power zones for changing a number of active phases in the multiphase power converter;a current quick response power zone up circuit coupled to the state machine, wherein when the multiphase power converter is in single-phase operation, the current quick response power zone up circuit is configured to operably monitor the summed signal and trigger a first signal for the state machine to switch the multiphase power converter to one of the plurality of power zones to increase the number of active phases if the summed signal is greater than a first threshold; anda dynamic reference voltage phase up circuit coupled to the state machine, ...

SWITCHING POWER SUPPLY

The switching element is turned ON and OFF according to when the current flowing through the inductance element becomes equal to zero and according to an amplified error voltage between the output voltage and a target output voltage. More particularly, the OFF time of the switching element is calculated, and when the OFF time is less than a prescribed value, the ON time of the switching element is increased. Moreover, the amount by which the ON time of the switching element is increased is reduced if the error voltage if greater than a prescribed value. 1. A switching power supply , comprising:a switching element that, when turned ON, forms a current path between terminals of an input power source through an inductance element;a voltage output circuit that, when the switching element is turned OFF, rectifies and smooths a current obtained from the inductance element in order to generate an output voltage;an error amplifier that generates an error voltage representing a difference between the output voltage and a prescribed target output voltage;a zero current detection circuit that determines that the current flowing through the inductance element has decreased to zero when the current flowing through the inductance element has decreased to less than a prescribed reference value;a ramp voltage generation circuit that starts generating a ramp voltage each time the switching element is turned ON;an ON/OFF control circuit that turns the switching element ON each time the zero current detection circuit detects zero current and subsequently turns the switching element OFF when the ramp voltage generated by the ramp voltage generation circuit exceeds the error voltage;an OFF time detection circuit that monitors an OFF time of the switching element;an ON time increasing circuit connected to the ramp voltage generation circuit, the ON time increasing circuit comparing the OFF time of the switching element as monitored by the OFF time detection circuit with a prescribed ...

POWER SUPPLY APPARATUS FOR POWER AMPLIFIER

A power supply apparatus for a power amplifier includes a converter configured to convert input power into driving power for the power amplifier, a detector configured to transfer the driving power from the converter to the power amplifier, including an inductor formed on a detection path of the driving power, and configured to detect power information regarding the driving power to generate a detected signal, and a controller configured to control power conversion of the converter based on an envelope signal of a signal input to the power amplifier and the detected signal. 1. A power supply apparatus , comprising:a converter configured to convert input power into driving power;a detector configured to transfer the driving power from the converter to a power amplifier, and comprising an inductor formed on a detection path of the driving power, and configured to detect power information of the driving power to generate a detected signal; anda controller configured to control power conversion of the converter based on an envelope signal of a signal input to the power amplifier and the detected signal.2. The power supply apparatus of claim 1 , wherein the detector comprises:a first detection path configured to detect voltage information of the driving power through a resistor connected to an input terminal of the inductor; anda second detection path configured to detect current information of the inductor through a capacitor connected to an output terminal of the inductor.3. The power supply apparatus of claim 2 , wherein the detector is configured to divide a first signal through the first detection path and a second signal through the second detection path claim 2 , and feed back the divided detected signal to the controller.4. The power supply apparatus of claim 1 , wherein the controller comprises:a first comparator configured to compare the detected signal with the envelope signal; anda second comparator configured to compare a comparison result of the first ...

ERROR AMPLIFIER CIRCUITS FOR DC-DC CONVERTERS, DC-DC CONVERTERS AND CONTROLLERS

An error amplifier circuit for a DC-DC power converter controller is disclosed for providing an amplified error signal to a switch control circuit, the circuit comprising an error amplifier first stage. The first stage comprises: a first input terminal for receiving a voltage proportional to an output voltage of the converter; an output node; a first operational transconductance amplifier in a first path between the input terminal and the output node and having a first input connected to the input terminal, a second input connectable to a reference signal, and an output connected to the output node; and a second, parallel, path comprising a series combination of an amplifier, a second OTA and a capacitor. The second OTA has an output connected to the capacitor, a first input connected to an output of the amplifier, and a second input connected to the output. Associated control circuits, controllers and converters are also disclosed. 1. An error amplifier circuit for a DC-DC power converter controller and configured to provide an amplified error signal to a switch control circuit , the error amplifier circuit comprising an error amplifier first stage; a first input terminal for receiving a voltage proportional to an output voltage of the DC-DC converter;', 'an output node;', 'a first operational transconductance amplifier, OTA, in a first path between the input terminal and the output node and having a first input connected to the input terminal, a second input connectable to a reference signal, and an output connected to the output node; and', 'a second path between the input terminal and the output node and comprising a series combination of a first amplifier, a second OTA and a first capacitor, wherein the second OTA has an output connected to the first capacitor, a first input connected to an output of the amplifier, and a second input connected to the output of the second OTA., 'the error amplifier first stage comprising2. An error amplifier circuit as claimed ...

INTEGRATED CIRCUIT AND POWER SUPPLY CIRCUIT

A power supply circuit includes an inductor, a power transistor configured to control an inductor current flowing through the inductor, and an integrated circuit driving the power transistor. The integrated circuit includes a first terminal that receives a power supply voltage for operating the integrated circuit, generated according to a variation in the inductor current, a second terminal to which a control electrode of the power transistor is coupled, a first drive circuit configured to drive the power transistor via the second terminal during a first time period to turn on the power transistor, and a second drive circuit configured to drive the power transistor via the second terminal during a second time period to turn on the power transistor, the second time period including at least a part of the first time period, driving capability of the second drive circuit being lower than that of the first drive circuit. 2. The integrated circuit according to claim 1 , further comprising a control circuit configured to control the first drive circuit such that a voltage at the second terminal is within a predetermined range claim 1 , based on the voltage at the second terminal upon turning on the power transistor.4. The integrated circuit according to claim 3 , whereinthe first determination circuit further determines whether the voltage at the second terminal is within the predetermined range, andthe adjustment circuit maintains the first time period, when the voltage at the second terminal is within the predetermined range.5. The integrated circuit according to claim 1 , wherein the second drive circuit drives the power transistor via the second terminal during the second time period claim 1 , the second time period including the first time period and being longer than the first time period.6. The integrated circuit according to claim 1 , wherein the first time period includesa first sub-period, anda second sub-period subsequent to the first sub-period, the driving ...

POWER CONVERSION APPARATUS, CONTROL MODULE, AND METHOD OF OPERATING THE SAME

A power conversion apparatus supplies power to a load, and the power conversion apparatus includes a power switch, a transformer, and a control module. The control module alternately turns on and turns off a power switch of the power conversion apparatus to convert an input voltage into an output voltage through the transformer. When the power switch is turned off, a primary side of the transformer generates a resonance voltage. The control module sets a predetermined counting threshold according to the output voltage, and sets a blanking time interval according to a feedback signal related to the load. After the blanking time interval ends, the control module counts a number of an oscillation turning point generated by the resonance voltage due to the oscillation of the resonance voltage. When the number reaches the predetermined counting threshold, the control module turns on the power switch. 1. A power conversion apparatus supplying power to a load , the power conversion apparatus comprising:a power switch,a transformer having a primary side coupled to the power switch, and a resonance voltage generated on the primary side when the power switch is turned off, anda control module coupled to the power switch, and configured to alternately turn on and turn off the power switch to convert an input voltage into an output voltage through the transformer, set a predetermined counting threshold according to the output voltage, and set a blanking time interval according to a feedback signal related to the load;wherein, after the blanking time interval ends, the control module counts a number of oscillation turning points presented during an oscillation of the resonance voltage, and turns on the power switch when the number reaches the predetermined counting threshold.2. The power conversion apparatus as claimed in claim 1 , wherein the control module comprises:a timing unit configured to set the blanking time interval according to a feedback signal, wherein the feedback ...

CONVERTER MODULE WITH PHASE SHIFT

A converter module is provided with a first power delivery circuit, a second power delivery circuit, and a controller. The first power delivery circuit supplies current from a first direct current (DC) source to a resonant stage in a first direction. The first power delivery circuit comprises at least two first switches. The second power delivery circuit supplies the current from the first DC source to the resonant stage in a second direction, opposite the first direction. The controller includes memory, and a processor that is programmed to: enable the first power delivery circuit and the second power delivery circuit alternately to provide power as a periodic waveform to the resonant stage; and disable the at least two first switches individually in a sequence to generate a phase shift in the periodic waveform and to disable the first power delivery circuit. 1. A converter module comprising:a first power delivery circuit to supply current from a first direct current (DC) source to a resonant stage in a first direction, the first power delivery circuit comprising at least two first switches;a second power delivery circuit to supply the current from the first DC source to the resonant stage in a second direction, opposite the first direction; and enable the first power delivery circuit and the second power delivery circuit alternately to provide power as a periodic waveform to the resonant stage; and', 'disable the at least two first switches individually in a sequence to generate a phase shift in the periodic waveform and to disable the first power delivery circuit., 'a controller including memory, and a processor programmed to2. The converter module of wherein the phase shift of the periodic waveform comprises a constant voltage segment between two edge portions extending between a maximum voltage and a minimum voltage.3. The converter module of wherein the constant voltage segment is approximately equal to zero volts.4. The converter module of claim 1 , wherein ...

VOLTAGE CONVERSION DEVICE AND VOLTAGE CONVERSION METHOD

A voltage conversion device and a voltage conversion method are provided in which, even immediately after switching a switching frequency, it is possible to suppress fluctuation of output voltage and possible to output a constant voltage in a stable manner. When switching the switching frequency from a first frequency to a second frequency, a duty ratio is changed in a first cycle of a PWM signal immediately after switching so as to be smaller than the duty ratio before switching. The amount of change in this case is set such that a lower limit value of inductor current immediately after switching the switching frequency matches the lower limit value in a steady state. With this sort of change, an increase in the inductor current immediately after switching is suppressed, fluctuation of the output voltage is suppressed, and a stable constant voltage is outputted to a load. 1. A voltage conversion device having a switching element , an inductor , and a drive circuit , the voltage conversion device generating , by turning the switching element on/off with the drive circuit with a PWM signal , an inductor current to transform an inputted voltage and output the transformed voltage to a load , the voltage conversion device comprising:switching means for switching a switching frequency with the drive circuit according to the size of output current to the load; andchanging means for changing a waveform of the PWM signal when the switching means switches the switching frequency;wherein the changing means changes an on time of the PWM signal, and turns the switching element on/off.2. The voltage conversion device according to claim 1 ,wherein the changing means sets a change amount of the waveform of the PWM signal such that a lower limit value of the inductor current immediately after switching the switching frequency matches the lower limit value in a steady state.3. The voltage conversion device according to claim 1 ,wherein the change amount of the waveform of the PWM ...

SEMICONDUCTOR DEVICE FOR CONTROLLING POWER SOURCE

A semiconductor device for power supply control includes an on/off control signal generation circuit which generates a control signal to turn on or off the switching element, a high-voltage input start terminal to which alternating-current voltage of AC input or voltage rectified in a diode bridge is input, a high-voltage input monitoring circuit connected to the high-voltage input start terminal and monitoring voltage of the high-voltage input start terminal, and a discharging unit connected between the high-voltage input start terminal and a ground point. When the high-voltage input monitoring circuit detects that a time for which the voltage of the high-voltage input start terminal is not lower than a predetermined voltage value for a predetermined period, the discharging unit is turned on. 1. A semiconductor device for power supply control , that generates and outputs a driving pulse to turn on or off a switching element which intermittently supplies current to a primary-side winding wire of a transformer for voltage conversion , by inputting voltage in proportion to current flowing in the primary-side winding wire of the transformer and an output voltage detection signal from a secondary side of the transformer , the semiconductor device comprising:an on/off control signal generation circuit which generates a control signal to turn on or off the switching element;a high-voltage input start terminal to which alternating-current voltage of AC input or voltage rectified in a diode bridge is input;a high-voltage input monitoring circuit which is connected to the high-voltage input start terminal and monitors voltage of the high-voltage input start terminal; anda discharging unit which is connected between the high-voltage input start terminal and a ground point, whereinwhen the high-voltage input monitoring circuit has detected that a time for which the voltage of the high-voltage input start terminal is not lower than a predetermined voltage value for a ...

RESONANT CONVERTING APPARATUS AND CONTROL METHOD THEREOF

A resonant converting apparatus and a control method thereof are provided. The resonant converting apparatus includes a resonant converting circuit, a load detector, a control signal generator and a pulse frequency modulation (PFM) signal generator. The resonant converting circuit converts an input voltage into an output voltage to drive a load according to a PFM signal. The load detector detects a load status of the load. The control signal generator generates the control signal according to the load status and a PFM range. When the load status is a light load status, the control signal is divided into a plurality of first time periods and second time periods which are respectively arranged alternatively. The PFM signal is maintained to a reference voltage during the second time periods, and is a periodical signal having frequency substantially equal to a resonant frequency during the first time periods. 1. A resonant converting apparatus , comprising:a resonant converting circuit, receiving an input voltage, and converting the input voltage to generate an output voltage according to a pulse frequency modulation signal, and the resonant converting circuit providing the output voltage to drive a load;a load detector, coupled to the resonant converting circuit, and detecting a load status of the load; anda control signal generator, coupled to the load detector and the resonant converting circuit, and generating a control signal according to the load status and a pulse frequency modulation range; anda pulse frequency modulation signal generator, coupled between the control signal generator and the resonant converting circuit, and generating the pulse frequency modulation signal according to the control signal.2. The resonant converting apparatus as claimed in claim 1 , wherein when the load status is a light load status claim 1 , the control signal generator divides the control signal into a plurality of first time periods and a plurality of second time periods ...

Pulse-Frequency Modulation Constant on-time with Peak-Current Servo

The disclosure describes a DC-DC switching converter providing a peak-current servo, employing a pulse-frequency modulation (PFM) control signal and a constant on-time. A Buck, Boost, Buck-Boost, or similar switching converter that supports PFM mode is required, using a fixed on-time scheme for PFM. A final value of the coil current is sampled, and the sampled value of the coil current is compared to a target value for the coil current, to establish whether it is greater or less than the target value. The on-time of the high side device is adjusted to bring the final value of the coil current closer to the target value, using an adaptive coil current measurement. 1: A DC-DC switching power converter , comprising:a high-side and a low-side device, configured to be connected to a node of said DC-DC switching power converter;a sampling circuit configured to sample a first voltage at said node, and a second voltage proportional to a reference voltage;a comparator to compare said first and said second voltages;a counter having an output configured to change based on an output of said comparator; anda timer configured to adjust an on-time of said high-side device based on said counter output.2: The DC-DC switching power converter of claim 1 , wherein said high-side and said low-side devices are configured to employ a pulse-frequency modulation (PFM) control signal and a controlled on-time.3: The DC-DC switching power converter of claim 1 , wherein said first voltage is proportional to a peak current claim 1 , and said second voltage is proportional to a target current.4: The DC-DC switching power converter of claim 3 , wherein said comparator is configured to compare said first and second voltages just after said high side device turns off.5. (canceled)6: The DC-DC switching power converter of claim 3 , wherein said counter is configured in a loop claim 3 , to adjust said on-time of said high side device claim 3 , such that a peak current of subsequent cycles is ...

CONTROL CIRCUIT FOR SYNCHRONOUS RECTIFIER AND THE METHOD THEREOF

A synchronous switching converter with an energy storage component and a synchronous rectifier coupled to the energy storage component, having: a secondary control circuit configured to receive a slew rate threshold adjusting signal and a voltage across the synchronous rectifier, and to provide a secondary control signal; wherein the secondary control circuit detects a slew rate of the voltage across the synchronous rectifier, and maintains the synchronous rectifier being off when the slew rate of the voltage across the synchronous rectifier is lower than a slew rate threshold. 1. A synchronous switching converter with an energy storage component and a synchronous rectifier coupled to the energy storage component , comprising:a secondary control circuit having a first input terminal configured to receive a slew rate threshold adjusting signal, a second input terminal configured to receive a voltage across the synchronous rectifier, and an output terminal configured to provide a secondary control signal based on the slew rate threshold adjusting signal and the voltage across the synchronous rectifier to control the synchronous rectifier; andwherein the secondary control circuit detects a slew rate of the voltage across the synchronous rectifier, and maintains the synchronous rectifier being off when the slew rate of the voltage across the synchronous rectifier is lower than a slew rate threshold.2. The synchronous switching converter of claim 1 , further comprising a secondary control chip claim 1 , wherein the secondary control circuit is integrated in the secondary control chip claim 1 , and the secondary control chip has a slew rate threshold adjusting pin configured to couple the first input terminal of the secondary control circuit to an off-chip component.3. The synchronous switching converter of claim 1 , wherein the secondary control circuit comprises:an on control circuit having a first input terminal configured to receive the voltage across the synchronous ...

ABNORMALITY DETERMINATION SYSTEM

In an abnormality determination system, when a drive signal is input and no shutdown signal for stopping gate drive of switching elements is input, a signal switching section outputs the drive signal to a bridge circuit. When a shutdown signal is input, the signal switching section stops output of the drive signal and activates a shutdown function of an inverter. An abnormality determination section determines an abnormality in the shutdown function. When a power source relay is opened, a control unit drives the bridge circuit to start a discharge process of discharging electric charge from a smoothing capacitor, and activates the shutdown function during execution of the discharge process. When it is determined that a directly or indirectly detected voltage of the smoothing capacitor has dropped during operation of the shutdown function, the abnormality determination section determines that the shutdown function is abnormal. 1. An abnormality determination system comprising:at least one inverter that includes: a bridge circuit in which a plurality of switching elements are bridge-connected; a smoothing capacitor that is provided at an input part of the bridge circuit; and a control unit that controls driving of the bridge circuit, and converts direct-current power input from a direct-current power supply source to the bridge circuit to alternating-current power, and supplies the alternating-current power to a rotary electrical machine; andat least one power source relay that is provided between the direct-current power supply source and the smoothing capacitor and is capable of shutting off power supply from the direct-current power supply source to the bridge circuit, whereinthe control unit includes: a gate command section that generates a drive signal for driving gates of the plurality of switching elements in the bridge circuit; a signal switching section that, when the drive signal is input and no shutdown signal for stopping gate drive of the plurality of ...

REFERENCE VOLTAGE CONTROL IN A POWER SUPPLY

A power supply includes a power converter, a reference voltage generator, and a controller. During operation, the power converter produces an output voltage to power a load. The reference voltage generator (such as a voltage mode amplifier circuit) generates a floor reference voltage, a magnitude of which varies as a function of the output voltage. The controller compares an output voltage feedback signal (derived from the output voltage) to the floor reference voltage to produce control output to control timing of activating switches in the power converter to maintain the output voltage within a desired voltage range. 1. A method comprising:producing an output voltage to power a load;generating a floor reference voltage, a magnitude of the floor reference voltage being adapted to vary as a function of the output voltage; andproducing control output as a function of the floor reference voltage and the output voltage to control generation of the output voltage.2. The method as in claim 1 , wherein producing the control output includes:receiving an output voltage feedback signal derived from the output voltage; andcomparing the output voltage feedback signal to the floor reference voltage to produce the control output.3. The method as in claim 1 , wherein generating the floor reference voltage includes implementing an integrator amplifier circuit to generate the floor reference voltage based on a magnitude of the output voltage and a fixed reference voltage.4. The method as in claim 3 , wherein the integrator amplifier circuit is configured to include a combination pole and zero set by components disposed in a feedback path between an output of the amplifier circuit to an inverting input of the amplifier circuit.5. The method as in claim 3 , wherein the integrator amplifier circuit includes a first gain path and a second gain path claim 3 , the first gain path providing DC (Direct Current) gain claim 3 , the second gain path providing AC (Alternating Current) gain.6. ...

CONVERTER AND METHOD FOR OPERATING A CONVERTER

A converter having a negative DC terminal and a positive DC terminal; at least three AC terminals, each AC terminal being arranged for an associated AC current to flow through the terminal, a converter bridge with at least three bridge legs, each bridge leg being associated with one of the at least three AC terminals and being able to connect the associated AC terminal to the negative DC terminal or the positive DC terminal; and a current measurement circuit having a current measurement element, the current measurement circuit being configured to guide either none or one or more of the AC currents flowing through one of the at least three AC terminals through the current measurement element. 1. An converter , comprisinga negative DC terminal and a positive DC terminal;at least three AC terminals, each AC terminal being arranged for an associated AC current to flow through the terminal;a converter bridge with at least three bridge legs, each bridge leg being associated with one of the at least three AC terminals and being able to connect the associated AC terminal to the negative DC terminal or the positive DC terminal;wherein the converter comprisesa current measurement circuit comprising a current measurement element, the current measurement circuit being configured to guide either none or one or more of the AC currents flowing through one of the at least three AC terminals through the current measurement element.2. The converter of claim 1 , wherein the current measurement circuit is configured to guide a selected one of the AC currents through the current measurement element claim 1 , based on information which AC current is the selected one received during operation of the converter.3. The converter of claim 1 , wherein the current measurement circuit is connected to the at least three AC terminals and the negative DC terminal claim 1 , and each lower branch and each lower switch of the converter bridge have an associated switch of the current measurement ...

WELDING POWER SUPPLIES HAVING ADJUSTABLE CURRENT RAMPING RATES

Welding power supplies having adjustable current ramping rates are disclosed. An example welding power supply, comprising: a switched mode power supply to convert primary power to welding-type power having an output current based on a current control loop; a voltage sensing circuit to measure a weld voltage; a voltage comparator to determine whether the weld voltage corresponds to a welding arc condition or a short circuit condition; and a control circuit to: select a current ramping rate; and execute the current control loop to control the output current, the control circuit configured to, while the weld voltage corresponds to the short circuit condition, increase the output current at the current ramping rate. 1. A welding power supply , comprising:a switched mode power supply to convert primary power to welding-type power having an output current based on a current control loop;a voltage sensing circuit to measure a weld voltage;a voltage comparator to determine whether the weld voltage corresponds to a welding arc condition or a short circuit condition; and select a current ramping rate; and', 'execute the current control loop to control the output current, the control circuit configured to, while the weld voltage corresponds to the short circuit condition, increase the output current at the current ramping rate., 'a control circuit to2. The welding power supply as defined in claim 1 , further comprising a user input device to receive a current ramping rate input claim 1 , the control circuit configured to select the current ramping rate based on the current ramping rate input.3. The welding power supply as defined in claim 2 , further comprising a second user input device to receive an output current setpoint claim 2 , the control circuit configured to claim 2 , when the weld voltage corresponds to a welding arc claim 2 , control the output current based on the output current setpoint.4. The welding power supply as defined in claim 2 , wherein a ratio of a ...

HIGH-VOLTAGE POWER SUPPLY APPARATUS AND IMAGE FORMING APPARATUS

A high-voltage power supply that outputs high voltages having a predetermined polarity and a reverse polarity performs control in a manner that, during a transition period in which switching of a target voltage of the high voltage having the reverse polarity from the predetermined polarity is performed, a setting value in accordance with a voltage higher than a target voltage is set as the voltage having the reverse polarity, and then a setting value in accordance with the target voltage is set as the voltage having the reverse polarity. 1. A high-voltage power supply apparatus comprising:a first high voltage generation unit configured to output a first high voltage having a predetermined polarity;a second high voltage generation unit connected to the first high voltage generation unit and configured to output a second high voltage having a polarity reverse to the polarity of the first high voltage; anda control unit configured to control the first high voltage generation unit and the second high voltage generation unit in a manner that the first high voltage and the second high voltage are selectively output,wherein, during a transition period from a state in which the first high voltage is output is switched to a state in which the second high voltage is output, the control unit sets a setting value in accordance with a voltage higher than a target voltage of the second high voltage as a setting value for outputting the second high voltage and then sets a setting value in accordance with the target voltage as the setting value for outputting the second high voltage.2. The high-voltage power supply apparatus according to claim 1 , wherein the control unit stops the output of the first high voltage from the first high voltage generation unit during the transition period and starts the output of the second high voltage from the second high voltage generation unit.3. The high-voltage power supply apparatus according to claim 1 , further comprising:a setting unit ...

POWER SUPPLY CONTROLLING DEVICE, POWER SUPPLY DEVICE, IMAGE FORMING APPARATUS, AND POWER SUPPLY CONTROLLING METHOD

A power supply controlling device includes: a direct-current power supply configured to output a direct-current voltage; an alternating-current power supply configured to output one selected from between a superimposed voltage obtained by superimposing an alternating-current voltage onto the direct-current voltage and the direct-current voltage; a bypass capacitor configured to partially store therein an output from the alternating-current power supply and configured to, when the direct-current voltage is output from the direct-current power supply while no electric charge is stored therein, store therein a second direct current being a part of a first direct current output from the direct-current power supply in conjunction with the output of the direct-current voltage; and a power supply controlling unit configured to cause the direct-current power supply to control a level of the direct-current voltage based on a target value for the first direct current and a value indicating the second direct current. 1. A power supply controlling device comprising:a direct-current power supply configured to output a direct-current voltage;an alternating-current power supply configured to output one selected from between a superimposed voltage obtained by superimposing an alternating-current voltage onto the direct-current voltage and the direct-current voltage;a bypass capacitor configured to partially store therein an output from the alternating-current power supply and configured to, when the direct-current voltage is output from the direct-current power supply while no electric charge is stored therein, store therein a second direct current being a part of a first direct current output from the direct-current power supply in conjunction with the output of the direct-current voltage; anda power supply controlling unit configured to cause the direct-current power supply to control a level of the direct-current voltage based on a target value for the first direct current and a ...

DIAGNOSTIC SYSTEM FOR A DC-DC VOLTAGE CONVERTER

A diagnostic system for a DC-DC voltage converter is provided. An analog to digital converter measures a first low voltage level at a low voltage terminal of a DC-DC voltage converter and generates a first low voltage value based on the first low voltage level. A first buck mode monitoring application sets a first buck mode status flag equal to a first fault value when the first low voltage value is greater than a first maximum voltage value. A first buck mode diagnostic handler application transitions each of the high voltage switch and the low voltage switch to an open operational state when the first buck mode status flag is equal to the first fault value. 1. A diagnostic system for a DC-DC voltage converter operating in a buck operational mode , the DC-DC voltage converter having a high voltage switch , a low voltage switch , a DC-DC converter control circuit , a high voltage terminal , and a low voltage terminal; the DC-DC converter control circuit being electrically coupled between and to the high voltage switch and the low voltage switch , the high voltage switch being further electrically coupled to the high voltage terminal , the low voltage switch being further electrically coupled to the low voltage terminal , the diagnostic system comprising:a microcontroller having a microprocessor and an analog-to-digital converter, the microprocessor having a first buck mode monitoring application, a first buck mode diagnostic handler application, a second buck mode monitoring application, and a second buck mode diagnostic handler application;the analog to digital converter measuring a first low voltage level at the low voltage terminal of the DC-DC voltage converter and generating a first low voltage value based on the first low voltage level;the first buck mode monitoring application setting a first buck mode status flag equal to a first fault value when the first low voltage value is greater than a first maximum voltage value;the first buck mode diagnostic handler ...