ГАСИТЕЛЬНОЕ УСТРОЙСТВО ДЛЯ РЕКУПЕРИРУЮЩЕЙ МОСТОВОЙ СХЕМЫ ВЕНТИЛЬНОГО ПРЕОБРАЗОВАНИЯ

Использование: в области электротехники. Технический результат заключается в увеличении быстродействия и надежности работы. Мостовая схема вентильного преобразователя, управляемая пусковыми импульсами схемы (AST) управления, синхронизированной с сетью, своими тремя входами (1U1, 1V1, 1W1) подключена к фазам (U, V, W) трехфазной сети, а оба выхода (1С1, 1D1) мостовой схемы связаны с электродвигателем (МОТ) постоянного тока, который в генераторном режиме через мостовую схему возвращает энергию в трехфазную сеть, и гасительное устройство управляется блоком (ALE) управления, от которого выдаются импульсы управления в зависимости от контроля электрических и временных параметров. В соответствии с изобретением из измеренных значений «выходной постоянный ток» и/или «сетевые напряжения» определяются характеристические параметры, которые сравниваются с теоретическими параметрами, и в соответствии с этим сравнением осуществляется активирование гасительного устройства. 3 н. и 36 з.п. ф-лы, 3 ил.

ТОПОЛОГИЯ СХЕМЫ ДЕМПФИРОВАНИЯ ТОКОВ КОРОТКОГО ЗАМЫКАНИЯ, МЕТОД И ПРЕОБРАЗОВАТЕЛЬ НА ЕЕ ОСНОВЕ

Изобретение относится к области преобразовательной техники. Предложена топология схемы демпфирования токов короткого замыкания, метод и преобразователь на ее основе. Анод отдельного диода соединен с положительным электродом второго коммутационного модуля, катод отдельного диода соединен с одним концом накопительного конденсатора энергии, а другой конец накопительного конденсатора энергии соединен с отрицательным электродом первого коммутационного модуля; демпфирующий резистор соединен параллельно с разрядником, а затем с первым переключающим модулем; байпасный переключатель соединен параллельно между клеммой х1 и клеммой х2 схемы демпфирования токов короткого замыкания; система питания получает энергию от накопителя энергии и подает питание на систему управления; а система управления руководит рабочим состоянием схемы демпфирования токов короткого замыкания путем управления переключателем байпаса, первым переключающим модулем и вторым модулем переключателя. Схема демпфирования токов короткого ...

ПРЕОБРАЗОВАТЕЛЬ, ПЕРЕКЛЮЧАЮЩАЯ ЯЧЕЙКА И СПОСОБ УПРАВЛЕНИЯ ПРЕОБРАЗОВАТЕЛЕМ

... 1. Преобразователь (1) с рядом входов и рядом выходов для преобразования входного напряжения в выходное напряжение, содержащий:множество мостовых плеч (2), содержащих одну или более переключающих ячеек (3), соединенных последовательно, при этом каждое мостовое плечо соединяет один из входов с одним из выходов;соответствующее устройство (39) контроля в каждой переключающей ячейке (3), выполненное с возможностью выявления неисправности;соответствующий триггерный элемент (41) в каждой переключающей ячейке (3), выполненный с возможностью замыкания накоротко выводов переключающей ячейки;центральное устройство (11) контроля, содержащее линию связи с каждым устройством (39) контроля и выполненное с возможностью:приема сигнала о неисправности, выявленной одним из устройств (39) контроля, изапуска одного из триггерных элементов (41), если после выявления неисправности в одной переключающей ячейке (3), не выявлена неисправность в еще какой-нибудь переключающей ячейке (3).2. Переключающая ячейка ( ...

DELETE DEVICE FOR A BACKFEEDING STATIC INVERTER BRIDGE

SCHALTUNGSANORDNUNG FUR DEN UBERLASTUNGSSCHUTZ EINER EINRICHTUNG ZUM STABILISIEREN EINER GLEICHSPANNUNG

STROMRICHTERSCHUTZ

ELECTRONIC CONTROL SYSTEMS AND - PROCEDURES

MECHANISM FUR UBERSPANNUNGSSCHUTZ PREFERABLY A DIRECT STATIC FREQUENCY CHANGER IN THE ROTOR CIRCLE OF AN ASYNCHRONOUS MACHINE

SWITCHING CONFIGURATION FOR THE CONTROL OF WELDING RIVERS ALSO OVER A TRANSFORMER EN BUNDENEM PRIMARY CIRCLE AND SEKUNDAERKREIS

PROTECTIVE CIRCUIT FOR SUPPLY SYSTEMS

SCHALTUNGSANORDNUNG ZUM AUSWERTEN VON RUECKMELDUNGEN

SWITCHING CONFIGURATION FOR THE DELIMITATION AND REGULATION OF THE KOLLEKTORSTROMES OF THE CONTROL MEMBER TRANSISTOR OF A SWITCH POWER PACK.

SWITCHING CONFIGURATION FOR THE OVERLOAD PROTECTION OF A MECHANISM FOR THE STABILIZATION OF DC VOLTAGE

MECHANISM FOR OVERVOLTAGE PROTECTION PREFERABLY A DIRECT STATIC FREQUENCY CHANGER IN THE ROTOR CIRCLE OF AN ASYNCHRONOUS MACHINE

PROTECTIVE CIRCUIT AGAINST COMPRESSION IGNITION FUER THYRISTORS

Overvoltage protection and power saving circuit for a switched mode power supply

The present invention relates to electrical power supplies and, more particularly, to an overvoltage protection and power saving circuit in switched-mode power supplies (SMPS) (1). It is proposed a switched-mode power supply (1) coupled to an AC voltage source and comprising a transformer having a primary side winding and a secondary side winding, said switched-mode power supply (1) further comprising a rectifier, an input capacitor and an SMPS controller. According to the invention, a low voltage blocker ensures that if a bus voltage that is lower than a certain level is measured, a band gap reference comparator that is in series with said low voltage blocker is be energized.

Fault current-suppressing damper topology circuit and control method thereof and converter

A fault current-suppressing damper topology circuit and a control method thereof, and a converter. An anode of a separate diode is connected with a positive electrode of a second switch module, a cathode of the separate diode is connected with one end of an energy storage capacitor, and the other end of the energy storage capacitor is connected with a negative electrode of a first switch module; a damping resistor is connected in parallel with a lightning arrester and then with the first switch module; a bypass switch is connected in parallel between a terminal x1 and a terminal x2 of the damper topology circuit; a power supply system acquires energy from the energy storage capacitor and supplies power to a control system; the control system controls the operating state of the damper topology circuit by controlling the bypass switch, the first switch module and the second switch module. The fault current-suppressing damper topology circuit is applied to voltage-source converters. In case ...

A liquid system tool having an integrated residual current device

Disclosed herein is a liquid system tool having an integrated residual current device, RCD. The liquid system tool comprises a current circuit having a power input for receiving an alternating electrical current, AC, a rectifier for rectifying the AC into a direct current, DC, a voltage booster for increasing a DC voltage and a motor unit connected to an output of the voltage booster for driving the liquid system tool. The RCD comprises a sensor element connected to an output of the rectifier and an input of the voltage booster and being configured to collect an analog current signal and an analog to digital, A/D, converter configured to convert the analog current signal into a digital current signal. The integrated RCD further comprises a logic unit connected to the A/D converter, wherein the logic unit is configured to evaluate the digital current signal and compare it to a current requirement, and wherein if the logic unit determines that the digital current signal does not fulfill the ...

TRANSFORMER PROTECTIVE CIRCUIT

DETECTING SHORTED SWITCH CONTACTS

ENABLING SOFT-FAILURE OF MODULAR POWER CONVERTER SYSTEMS

CONVERTER WITH ACTIVE FAULT CURRENT LIMITATION

A voltage source converter (20) for high voltage DC power transmission that is connectable, in use, between a DC network (22) and another electrical network (24) to interconnect the DC network (22) and the other electrical network (24). The voltage source converter (20) comprises a converter unit (26) to convert power flowing between the DC network (22) and the other electrical network (24) and at least one fault unit (28). The or each fault unit (28) includes at least one fault module (30) having a voltage source (36) that is operable, in the event of a short circuit in a DC network (22) connected to the voltage source converter (20), to produce a voltage that acts to reduce current flowing through the voltage source converter (20) and the short circuit.

DISSIPATION LIMITER CIRCUIT

IMPEDANCE MONITORING CIRCUIT

ELECTRONIC CONTROL SYSTEMS AND METHODS

An apparatus in an electronic control system allows two or three wire operations. A power supply (150) can supply power to the enclosed circuity in both two and three wire installations. Two separate zero cross detectors are used such that timing information can be collected in both two or three wire installations. Both zero cross detectors (110) are monitored and are used to automatically configure the electronic control. Over voltage circuity senses an over voltage condition across a MOSFET which is in the off state and turns the MOSFET on so that it desirably will not reach the avalanche region. Over current circuity senses when the current through the MOSFET's has exceeded a predetermined current threshold and then turns the MOSFETs off so they do not exceed the MOSFETs' safe operating area (SOA) curve. Latching circuity (120) is employed to keep the protection circuity in effect even after a fault condition has cleared. Lockout circuity (130) is used to prevent one protection circuit ...

ELECTRONIC CONTROL SYSTEMS AND METHODS

An apparatus in an electronic control system allows two or three wire operations. A power supply (150) can supply power to the enclosed circuity in both two and three wire installations. Two separate zero cross detectors are used such that timing information can be collected in both two or three wire installations. Both zero cross detectors (110) are monitored and are used to automatically configure the electronic control. Over voltage circuity senses an over voltage condition across a MOSFET which is in the off state and turns the MOSFET on so that it desirably will not reach the avalanche region. Over current circuity senses when the current through the MOSFET's has exceeded a predetermined current threshold and then turns the MOSFETs off so they do not exceed the MOSFETs' safe operating area (SOA) curve. Latching circuity (120) is employed to keep the protection circuity in effect even after a fault condition has cleared. Lockout circuity (130) is used to prevent one protection circuit ...

ELECTRONIC CONTROL SYSTEMS AND METHODS

An apparatus in an electronic control system allows two or three wire operations. A power supply (150) can supply power to the enclosed circuity in both two and three wire installations. Two separate zero cross detectors are used such that timing information can be collected in both two or three wire installations. Both zero cross detectors (110) are monitored and are used to automatically configure the electronic control. Over voltage circuity senses an over voltage condition across a MOSFET which is in the off state and turns the MOSFET on so that it desirably will not reach the avalanche region. Over current circuity senses when the current through the MOSFET's has exceeded a predetermined current threshold and then turns the MOSFETs off so they do not exceed the MOSFETs' safe operating area (SOA) curve. Latching circuity (120) is employed to keep the protection circuity in effect even after a fault condition has cleared. Lockout circuity (130) is used to prevent one protection circuit ...

Verfahren zum Betrieb von Generatoren für Funkenerosionsmaschinen und Schaltungsanordnung zur Ausübung des Verfahrens

Schaltungsanordnung zur Überlast- und Kurzschlussicherung eines Gleichspannungswandlers

Vorrichtung zur Überwachung von Betriebsparametern einer Hochspannungs-Ventilanordnung

Verfahren zur Erfassung eines fehlerhaften Betriebes von Stromrichtern

LOESCHWINKELMESSEINRICHTUNG FUER VENTILE EINES ELEKTRISCHEN VENTILSTROMRICHTERS.

SCHALTUNGSANORDNUNG ZUR SCHNELLEN LASTSTROMNULLMELDUNG BEI DER STEUERUNG EINES KREISSTROMFREIEN UMKEHRSTROMRICHTERS.

Uberwachungseinrichtung in einer Stromrichteranlage

Schutzschaltung gegen thermische Überlastung einer Impulssteuervorrichtung an einem im Impulsbetrieb betriebenen elektrischen Antrieb

Circuit arrangement for a regulated DC/DC voltage converter

Transistor DC flow converter with pulse-width control and limiting of the instantaneous current value

CIRCUIT FOR THE AUTOMATIC PROTECTION OF A POWER TRANSISTOR, IN PARTICULAR FOR CONVERTERS TO COMMUTATION.

Power converting device and a protection device for the same

For high-voltage DC-DC converter electronic protection module

REGULATING CIRCUIT FOR REGULATING CIRCUIT OF POWER AND APPARATUS ELECTRO COPIER (PHOTO) - GRAPHIC TEAM Of SUCH a REGULATING CIRCUIT

CIRCUIT DISJONCTEUR POUR REGULATEUR DE TENSION

Circuit disjoncteur pour régulateur commandé par phase. Le circuit disjoncteur détecte la sortie du régulateur et la compare à une tension de référence au moyen d'un comparateur à hystérésis 38 qui fournit un seuil de déclenchement et un seuil de restauration décalés. Si une surtension persiste, la sortie du comparateur 38 change d'état continuellement commandant une succession d'arrêts et mises en marche du régulateur. Les transistors Q1, Q2 et le comparateur 42 maintiennent la capacité active du régulateur hors circuit tant que dure la surtension. Application aux alimentations stabilisées.

DEVICE FOR THE PRODUCTION AND THE REGULATION OF CURRENTS OF STRONG INTENSITY, IN PARTICULAR OF THE CURRENTS OF WELDING

PROTECTIVE SYSTEMS FOR SWITCHES

Dispositif de sécurité pour convertisseur

Ce dispositif est destiné à inhiber le fonctionnement des convertisseurs électroniques assurant l'alimentation par courant à fréquence élevée de différents types de récepteurs qui peuvent se trouver brusquement déconnectés ou détruits. Le dispositif selon l'invention comprend un tore miniature 8 doté d'un bobinage bifilaire 6a et 6bparcouru par le courant du condensateur 7 appartenant au circuit oscillant du convertisseur 2. Lorsque ledit convertisseur entre en fonctionnement, un courant traverse le condensateur 7 ainsi que les deux enroulements 6a et 6b montés en opposition : l'induction résultante est nulle et la tension aux bornes de l'enroulement 6c l'est également. La charge 1 connectée, les courants qui traversent lesdits enroulements deviennent très différents : une induction du tore 8 est alors enregistrée, ce qui se traduit par l'existence d'une tension aux bornes de l'enroulement 6c. Cette tension redressée est appliquée aux bornes E et F qui, ainsi excitées assurent le maintien ...

CONVERTER Of ENERGY HAS STRUCTURE MODULAR

CONTROL CIRCUIT FOR AC SUPPLY CIRCUIT

MEANS FOR PROTECTING ELECTRIC POWER CONVERTER FROM COMMUTATION FAILURE

MODULE ACCOMODATING A DISC-SHAPED RECTIFIER ELEMENT

DEVICE FOR THE PRODUCTION AND THE REGULATION OF CURRENTS OF STRONG INTENSITY, IN PARTICULAR OF THE CURRENTS OF WELDING

CONVERTER OF CURRENT FEEDS BY a SINGLE-PHASE OR CONTINUOUS AIRCRAFT POWER SYSTEM Of AIRCRAFT AND OUTPUTTING a THREE-PHASE CURRENT

Switching configuration for electronic indicating fuse

POWER CONVERSION POWER SUPPLY WITH MONITORING AND REMOTE CONTROL AND OPERATING METHOD THEREOF

MODULAR MULTILEVEL CONVERTER AND METHOD FOR BLOCKING DC FAULT THEREOF

Provided are a modular multilevel converter (MMC) converter capable of reducing a loss while blocking a DC fault by using a sub-module of a full bridge and a sub-module of a half bridge mixed with a converter arm of the MMC converter, and a method for blocking a DC fault thereof. According to the present invention, in the MMC converter including a plurality of converter arms, each of the converter arms includes: N number of sub-modules directly connected with each other, wherein N is an integer number equal to or greater than 2; and a circuit open part directly connected with the N sub-modules to open a circuit of the converter arms. The N sub-modules include n number of sub-modules including a full bridge circuit and (N-n) number of sub-modules including a half bridge circuit, wherein n Подробнее

METHOD OF FAULT CLEARANCE

There is a method of fault clearance for a voltage source converter that interconnects a DC network and an AC network. The voltage source converter is connected to the DC network via one or more DC circuit interruption devices. The method comprises the steps of: (a) detecting a fault in the DC network; (b) carrying out a primary protection sequence, wherein the step of carrying out the primary protection sequence involves carrying out a first sub-sequence that includes the steps of: i. opening the or each DC circuit interruption device, ii. setting a DC power order of the voltage source converter to zero, iii. controlling the voltage source converter to exchange reactive power with the AC network.

STATIC CIRCUIT BREAKER

Protected aircraft power and phase converter

A compact power and phase converter is adapted to utilize the single-phase and direct current power outputs of a conventional aircraft power supply, converting such outputs into stable three-phase power on wye-connected, grounded neutral distribution lines. An automatic current limiter provides overload protection for the converter when excessive output current is demanded.

TEMPERATURE PROTECTION CIRCUIT

The present disclosure provides a temperature protection circuit for a power converter, including a plurality of temperature protection branches, each of the temperature protection branches comprises a resistor, a voltage source, a temperature switch, and an isolation transformer, and each of the temperature protection branches corresponds to one of the power semiconductor switch blocks, and a first end of the resistor of each of the temperature protection branches is coupled to an output electrode of the power semiconductor switch block, and a second end of the resistor is coupled to a first end of the voltage source and coupled to a first end of the contact of the temperature switch via a primary winding of the isolation transformer, a second end of the voltage source and a second end of the contact of the temperature switch are respectively coupled to the potential midpoint of the power converter.

Power supply device

A power supply device has a pulse width control circuit for controlling voltage converting operation of a voltage converting circuit by changing a pulse width. A momentary interruption detecting circuit detects a change in an output voltage when the output voltage suffers a momentary interruption over a short period of time. A full short-circuit detecting circuit detects a change in the output voltage when the output voltage suffers a short circuit over a very short period of time. A short-circuit control circuit stops a pulse width changing control process of the pulse width control circuit a predetermined period of time after the momentary interruption detecting circuit has detected that the output voltage suffers a momentary interruption, and stops the pulse width changing control process of the pulse width control circuit immediately when the full short-circuit detecting circuit detects that the output voltage suffers a short circuit.

System and method providing reliable over current protection for power converter

System controller and method for protecting a power converter. The system controller includes a first controller terminal configured to output a drive signal to a switch to affect a first current flowing through a primary winding of a power converter. The power converter further includes a secondary winding coupled to the primary winding, and the drive signal is associated with one or more switching periods. Additionally, the system controller includes a second controller terminal configured to receive a sensing voltage from a sensing resistor. The sensing voltage represents a magnitude of the first current flowing through the primary winding of the power converter. The system controller is configured to process information associated with the sensing voltage and a reference voltage, and determine whether an average output current of the power converter is larger than a current threshold.

Driving circuit for an electric load and system comprising the circuit

An electronic circuit (100) is disclosed, comprising a node (EX), which connectable to a load (LD) to be driven and a power device (PD), which can be switched between activation and deactivation and having a first terminal connected to said node. The circuit further comprises: a current generator (I) having an output connected to said node and that can be enabled to generation, at least when the power device is deactivated; a comparator (CP) of an electric voltage of said node (V(EX)) with a reference voltage (V(REF)) configured to obtain comparison signals (RESETN), from which distinct conditions of electric connection of the load to said node will be detected.

DIRECT CURRENT/DIRECT CURRENT CONVERTER AND CONTROL METHOD THEREOF

According to an embodiment, provided is a direct current/direct current converter comprising: a first switch unit located between a direct current link capacitor and a bridge circuit unit; a second switch unit connected in parallel with the first switch unit; a sensing unit for sensing a voltage across both ends of an inverter and a voltage across both ends of a second switch; and a control unit which controls an on-off operation of the first switch unit and the second switch unit, and determines whether a short circuit or a disconnection occurs by using the voltage across both ends of the inverter and the voltage across both ends of the second switch unit, wherein the control unit determines whether a short circuit or a disconnection occurs by using a voltage across both ends of the inverter and a voltage across both ends of the second switch unit, which are measured when the first switch unit is in an on state and the second switch unit is in an off state, and determines whether a disconnection ...

Устройство контроля качества изготовления фототиристора

Изобретение относится к области силовой электроники и предназначено для неразрушающего контроля качества изготовления фототиристоров на соответствие группе по скорости нарастания напряжения в закрытом состоянии и может быть использовано при производстве фототиристоров и эксплуатации. Устройство контроля качества изготовления фототиристора содержит источник питания, подключенный к устройству формирования сигнала заданной формы, регулятор амплитуды импульса, источник напряжения, задающий уровень амплитуды испытательного напряжения, стабилизатор напряжения и диод, при этом устройство формирования сигнала заданной формы содержит регулятор скорости зарядного напряжения, источник испытательного напряжения, зарядную цепь, блок управления, драйвер ключа, формирующую цепь, ключ сброса, источник тока удержания, измерительный модуль, детектор тока открытия, детектор параметров импульса, буферный конденсатор. Технический результат заключается в повышении эффективности работы устройства за счет возможности ...

СИЛОВОЙ ПРЕОБРАЗОВАТЕЛЬ И СПОСОБ ЕГО РАБОТЫ

УСТРОЙСТВО И СПОСОБ ДЛЯ ПРЕРЫВАНИЯ ТОКА В ЛИНИИ ПЕРЕДАЧИ ИЛИ РАСПРЕДЕЛЕНИЯ ЭНЕРГИИ И КОМПОНОВКА ОГРАНИЧЕНИЯ ТОКА

... 1. Устройство (13,17) для прерывания электрического тока, протекающего через линию (14) передачи или распределения энергии, содержащее параллельное соединение основного прерывателя (8, 15) и нелинейного резистора (11), причем основной прерыватель (8, 15) содержит, по меньшей мере, один мощный полупроводниковый переключатель (1) первого направления (4) тока, причемустройство дополнительно содержит последовательное соединение высокоскоростного переключателя (10), содержащего, по меньшей мере, один механический переключатель, и вспомогательного прерывателя (9, 16), причем вспомогательный прерыватель (9, 16) имеет меньшее сопротивление в открытом состоянии, чем основной прерыватель (8, 15) и содержит, по меньшей мере, один мощный полупроводниковый переключатель (1) первого направления (4) тока, причем упомянутое последовательное соединение соединено параллельно с упомянутым параллельным соединением; иустройство выполнено, чтобы открывать вспомогательный прерыватель при приеме сигнала вспомогательного ...

СХЕМА ЗАЩИТЫ ОТ ПЕРЕНАПРЯЖЕНИЯ И ЭНЕРГОСБЕРЕЖЕНИЯ ДЛЯ ИМПУЛЬСНОГО ИСТОЧНИКА ЭЛЕКТРОПИТАНИЯ

УСТРОЙСТВО И СПОСОБЫ ЗАЩИТЫ НА ВХОДЕ ПРЕОБРАЗОВАТЕЛЕЙ МОЩНОСТИ

... 1. Преобразователь мощности, содержащий:вывод входного сигнала;первый выходной сигнал на первом выводе выходного сигнала; иконтроллер, выполненный с возможностью:переключения первого выходного сигнала с первого значения на второе значение;измерения напряжения на выводе входного сигнала в зависимости от времени;установки флага на первое значение флага, если измеренное напряжение падает ниже заданного значения в пределах первого заданного интервала времени после переключения первого выходного сигнала с первого значения на второе значение;установки флага на второе значение флага, если измеренное напряжение не падает ниже заданного значения в пределах первого заданного интервала времени после переключения первого выходного сигнала с первого значения на второе значение; исохранения флага в памяти.2. Преобразователь мощности по п. 1, в котором:вывод входного сигнала соединен с выводом выходного сигнала первого автоматического выключателя;первый вывод выходного сигнала соединен с входом управления ...

Импульсный стабилизатор напряжения

Schutzbeschaltung gegen thermische UEberlastung von Impulssteuerungen fuer elektrische Antriebe

Motorantriebsvorrichtung mit Entladeschaltung für einen Kondensator eines Gleichstromanschlusses

Eine Motorantriebsvorrichtung (1) hat einen Konverter (11), der eingerichtet ist zum Wandeln von Wechselstrom einer Wechselstromquelle (2) in Gleichstrom und zum Abgeben des Gleichstroms an einen Gleichstromanschluss, einen Kondensator (12) in dem Gleichstromanschluss, einen Inverter (13) zum Wandeln von Gleichstrom in dem Gleichstromanschluss in Wechselstrom für einen Motorantrieb und zum Ausgeben des Wechselstromes, eine Entladeschaltung (14) in Parallelschaltung mit dem Kondensator (12) in dem Gleichstromanschluss, welche wahlweise umgeschaltet wird zwischen einem Entladebetrieb für Gleichstromenergie in den Gleichstromanschluss durch elektrische Verbindung der Entladeschaltung (14) mit dem Kondensator (12), und einem Nichtentladebetrieb zum Unterbrechen der elektrischen Verbindung zwischen der Entladeschaltung (14) und dem Kondensator (12), und mit einer Entladeschaltungstreibereinheit (15), eingerichtet zum Umschalten zwischen Entladebetrieb und Nichtentladebetrieb der Entladeschaltung ...

SAFETY APPARATUS

Spark erosion machines

... 1,074,464. Protecting transistor circuits. AEG-ELOTHERM G.m.b.H. May 28, 1965 [May 30, 1964], No. 22835/65. Heading H3T. [Also in Division H2] In a spark erosion machine having a control transistor 3 which is pulsed to produce successive discharged across the gap 5 between an electrode and a workpiece, means are provided for monitoring the current flowing through the transistor in the intervals between pulses. As shown, the voltage across the emitter resistor 2 is applied through a resistor 8 to the base of a transistor 9. Pulses from a timing generator (not shown) are applied to the base of the transistor 3 and to the collector of the'transistor 9, the pulses being timed so that the transistor 9 can conduct only in the intervals when the transistor 3 is not pulsed, providing the voltage produced across the resistor 2 by leakage or short-circuit current is sufficient. A relay 11 is energized when the transistor 9 conducts and is effective to interrupt the supply and may also cause an alarm ...

SWITCHED MODE POWER SUPPLY HAVING A DISCHARGE CIRCUIT FOR AN AUXILIARY POWER SOURCE

Power converters with rate of change monitoring for fault prediction and/or detection

Inverters

SURGE CURRENT PROTECTIVE CIRCUITS

PROTECTIVE SYSTEMS FOR SWITCHES

... 1512073 Protecting electronic switches A BOEHRINGER 7 May 1975 [8 May 1974] 19073/75 Heading H2K A cyclically-operated electronic switching device 3 is immediately switched off if, during an ON period, the voltage across it exceeds a permitted maximum, and is then switched on again after at least a predetermined delay. The delay may be obtained by resetting the circuit 4 which controls the repetitive switching.

Protection circuit for a switch mode power supply

SWITCHING REGULATORS

Method and device of abnormal efficiency protection for electrical apparatus

SWITCHING CONFIGURATION FOR THE DELIMITATION OF UEBERSPANNUNGEN AT A STATIC INVERTER VALVE AND FOR THE CURRENT SUPPLY OF A CONTROL CIRCUIT TO PROTECTING OF THE STATIC INVERTER VALVE.

Protective circuit against thermal overloading of impulse controls for electric drives

SCHUTZSCHALTUNG FUER VERSORGUNGSANLAGEN

ELECTRONIC TAX PROCEDURE

ELEKTRONISCHE SCHALTUNG MIT EINEM GESCHUETZTEN TRANSISTOR

EINRICHTUNG FUR UBERSPANNUNGSSCHUTZ VORZUGSWEISE EINES DIREKTUMRICHTERS IM ROTORKREIS EINER ASYNCHRONMASCHINE

STARTING SURGE CURRENT PROTECTION CIRCUIT

THYRISTOR MOTOR CONTROL CIRCUIT

CIRCUIT FOR MONITORING THE CURRENT DISTRIBUTION IN PARALLEL-CONNECTED CONVERTER BRANCHES

A circuit arrangement for monitoring the current inbalance in two parallel-connected converter branches, each of which includes at least two series-connected converter valves. The anodes and cathodes, respectively, of adjacent converter valves in a given branch are connected together via cross-connections containing current transformers. A differential current transformer is provided at the output junction point of the two converter branches. Starting with the output signal of the differential current transformer, the exact current misdistribution for each adjacent converter valve pair is determined via summing amplifiers by adding the currents of the transverse transformers. A protective measure is triggered if a current misdistribution occurs.

PROTECTIVE CIRCUIT FOR THYRISTORS

The invention relates to a protective circuit to prevent the spontaneous ignition of thyristors in a series circuit containing a large number of thyristors. First switching signals are formed when the voltage at the relevant thyristor becomes negative. These first switching signals are fed through a clearing unit to a common evaluating device and to a counting device, the latter producing a clearing signal for the clearing unit only when a pre-determined number of first switching signals has arrived. The evaluating device follows a number of second transmitting devices, for transmitting a common time signal, corresponding to the number of thyristors.

STARTING SURGE CURRENT PROTECTION CIRCUIT

SURGE CURRENT PROTECTION CIRCUIT A surge current protection circuit includes an input terminal supplied with a rectified alternating voltage, an output terminal to be connected to a load, and a semiconductor controlled rectifier having its anode and cathode electrodes connected in series between the input and output terminals. The collector and emitter electrodes of a control transistor are connected between the gate and cathode electrodes of the rectifier. The base-emitter voltage is supplied with any sharp transients, and the transistor becomes conductive before the rectifier if the transients are sharp enough and of high enough amplitude. Conduction of the transistor prevents the semiconductor controlled rectifier from conducting surge currents and protects circuits connected in series with the rectifier.

METHOD OF AND APPARATUS FOR ENABLING SOFT-FAILURE OF MODULAR POWER CONVERTER SYSTEMS, INCLUDING RF GENERATOR SYSTEMS, EMBODYING SWITCHING COMPONENTS IN THE POWER CONVERSION

The disclosure is concerned with enabling modular converter systems, including RF generators or transmitters involving such conversion, employing switching components such as SCRs in the power conversion, to fail in a soft manner as a result of transient electrical or other disturbances so as to permit continued system operation, through the use of individual module d.c. power supplies and circuit design that insures inverter module high output impedance even under SCR failure conditions and that mitigates against SCR failures caused by changes in load phase angle.

Детектор перехода тока через ноль

Полезная модель относится к области электротехники и может быть использована в системах управления полупроводниковыми преобразователями, регуляторами напряжения. Детектор перехода тока через ноль содержит выпрямительный мост, нагрузочный резистор, подключенный к выходу выпрямительного моста, стабилитрон, нуль-орган, оптрон. Дополнительно введены трансформатор тока, первичная обмотка которого подключена последовательно в цепь протекания контролируемого тока, а вторичная обмотка подключена ко входу выпрямительного моста, измерительный резистор, подключенный к выводам вторичной обмотки трансформатора тока, диод, анод которого подключен к положительному выводу выпрямительного моста, а катод подключен к катоду стабилитрона, анод которого подключен к отрицательному выводу выпрямительного моста, конденсатор, включенный параллельно стабилитрону, первый резистор, соединяющий положительный вывод выпрямительного моста с неинвертирующим входом компаратора, использующегося в качестве нуль-органа, второй резистор, соединяющий отрицательный вывод выпрямительного моста с инвертирующим входом компаратора, выводы питания которого подключены параллельно к стабилитрону и конденсатору, резистор обратной связи, первым выводом подключенный к неинвертирующему входу компаратора, а вторым выводом подключенный к его выходу, токоограничивающий резистор, первый вывод которого подключен к катоду стабилитрона, а второй вывод подключен к аноду светодиода оптотрансмиттера, использующегося в качестве оптрона, полевой транзистор, вывод стока которого подключен к выводу катода светодиода оптотрансмиттера, а вывод истока подключен к отрицатальному выводу выпрямительного моста, резистор, соединяющий затвор полевого транзистора с выходом компаратора. Полезная модель позволяет определять момент перехода тока через ноль при гальванической развязке силовой и измерительной цепи с максимально возможным напряжением изоляции и малом энергопотреблении. Все это позволяет повысить КПД и надежность детектора, ...

Coordinated control of multi-terminal hvdc systems

Multi-terminal HVDC systems and control methods therefore are disclosed. Methods for controlling multi-terminal HVDC systems having a plurality of converter stations may include receiving a plurality of measurements from a plurality of measurement units disposed on the HVDC system, identifying from the measurements a disruption within the HVDC system, monitoring the measurements to identify a steady-state disrupted condition for the HVDC system, calculating a new set point for at least one of the plurality of converter stations, which new set point may be based on the steady-state disrupted condition and the measurements, and transmitting the new set point to the at least one of the plurality of converter stations. In some examples, the HVDC systems may include an HVDC grid interconnecting the plurality of converter stations and a controller communicatively linked to the plurality of measurement units and the plurality of converter stations.

Overvoltage Protection for Inverters that Comprise an EMC Filter at Their Input End

In an overvoltage protection apparatus before an inverter configured to feed electric energy from a DC voltage source into an AC power grid, the overvoltage protection apparatus includes a DC voltage input stage. The DC voltage input stage includes, at least two current-carrying lines and an EMC filter including interference suppressing capacitors and interference suppressing inductors, and surge arrestors configured to divert overvoltages with respect to ground are connected to the current-carrying lines after the EMC filter, from a point of view of the DC voltage source.

Fault condition protection

A switched mode power supply includes a transformer and an integrated circuit regulator. The integrated circuit regulator is coupled to the transformer and includes switching regulator logic, a counter, and a switching transistor. The regulator logic generates a switching signal in response to the feedback signal. The counter receives the feedback signal, where the feedback signal periodically cycles between a first state and a second state when the switched mode power supply operates normally. An output of the counter indicates an auto-restart mode of the regulator in response to the feedback signal remaining in the first state for a predetermined count due to a fault condition. The switching transistor is coupled to be turned on and off in response to the switching signal when the output of the counter does not indicate the auto-restart mode and is disabled when the output of the counter indicates the auto-restart mode.

Hot swappable synchronous buck regulator

A synchronous buck regulator includes a voltage regulator, a sample unit, a switch element, a comparison unit, a time delay unit, and a control unit. The sample unit is connected to the external power source for sampling a voltage drop in the external power source. The comparison unit is connected to the sample unit for outputting a result-high signal when the current passing through the sample unit is greater than a predetermined current rating. The time delay unit is connected to the comparison unit for outputting a first result-low signal. The control unit is connected to the time delay unit and outputs a first a low level signal to the switch element according to the result-low signal. The switch element connects the sample unit and the voltage regulator and can isolate the voltage regulator from the external power source when the low level signal is received.

Power supply and data signal interface circuit with overvoltage protection

A data processing device with a power supply and data signal interface circuit has a switch for connecting an external line and an internal node. The power supply and data signal interface circuit also includes a controller for applying an enabling voltage to the switch enabling the switch to supply current between the external line and the internal node in the presence of power supply to the controller and in the absence of the overvoltage condition on the external line. The power supply and data signal interface circuit also includes a voltage reduction connection from the external line for applying a control voltage to the switch in the absence of power supply to the controller. The control voltage from the voltage reduction connection limits a voltage applied to the internal node through the switch in the presence of the overvoltage condition.

CONVERTER SYSTEM AND METHOD FOR THE OPERATION OF SUCH A CONVERTER

A converter system is provided for the switching of at least three voltage levels and for the switching of two voltage levels. A method is also provided for the operation of a converter system for the switching of at least three voltage levels and for the operation of a converter system for the switching of two voltage levels. 1. A converter system for the switching of least three voltage levels , the converter system comprising:a converter unit having a DC side and an AC side, the DC side of the converter unit being connected to a DC circuit having a voltage zero point, and the AC side of the converter unit is connected to a shorting circuit having a plurality of thyristors and at least two shorting resistors, wherein the converter unit is configured to monitor current carried by the converter unit in relation to a threshold value and, when the threshold value is exceeded, to actuate the thyristors by the application of a closing signal, such that the AC side of the converter unit is connected to the at least two shorting resistors; anda voltage-limiting device connected to the DC circuit and to the at least two shorting resistors, the voltage-limiting device being configured to restrict any overvoltage on the DC circuit and to turn-off the thyristors,wherein when the threshold value is no longer exceeded, the converter unit is configured to switch the AC side of the converter unit to the voltage zero point of the DC circuit and terminate application of the closing signal, andwherein the voltage-limiting device is configured to connect the at least two shorting resistors to the DC circuit for a configurable time interval, whereafter the converter unit is configured to isolate the AC side of the converter unit from the voltage zero point of the DC circuit once more.2. A converter system for the switching of two voltage levels , the converter system comprising:a converter unit having a DC side and an AC side, the DC side of the converter unit being connected to a DC ...

SWITCHING POWER SUPPLY CIRCUIT PROVIDED WITH PROTECTION FUNCTION

The present invention includes: a transformer having a primary winding, a secondary winding and a tertiary winding; a primary-side rectifying and smoothing circuit, which converts alternating-current power to direct-current power and smoothes the power; a secondary-side rectifying and smoothing circuit, which smoothes secondary-side power; a tertiary-side rectifying and smoothing circuit, which smoothes power of the tertiary winding; a switching circuit, which opens and closes the primary winding; a pulse width control circuit, which controls the pulse width of drive signals that control the opening and closing of the switching circuit; and a secondary-side electrolytic capacitor deterioration detecting circuit, which detects deterioration of the secondary-side electrolytic capacitor. The secondary-side electrolytic capacitor deterioration detecting circuit detects deterioration of the secondary-side electrolytic capacitor by inputting the output voltage of the tertiary-side rectifying and smoothing circuit, and stops operation of a switching power supply circuit. 1. An X-ray photographing device comprising: an X-ray 1. A switching power supply circuit , provided with a protection function , comprising:a transformer having a primary winding, a secondary winding and a tertiary winding; a primary-side rectifying circuit configured to convert an alternating-current power to a direct-current power;a primary-side electrolytic capacitor for smoothing the direct-current power from the primary-side rectifying circuit;a secondary-side rectifying circuit for converting an alternating-current power, outputted by the secondary winding of the transformer, to a direct-current power;a secondary-side electrolytic capacitor for smoothing the direct-current power outputted from the secondary-side rectifying circuit;a switching circuit for repeatedly opening and closing the primary winding of the transformer that inputs a voltage of the primary-side electrolytic capacitor;a pulse ...

Power Module Package Having a Multi-Phase Inverter and Power Factor Correction

According to an exemplary implementation, a power module package includes a multi-phase inverter. The power module package also includes a multi-phase inverter driver configured to drive the multi-phase inverter. The power module package further includes a power factor correction (PFC) circuit where the PFC circuit is configured to regulate a bus voltage of the multi-phase inverter and a PFC driver configured to drive the PFC circuit. The multi-phase inverter, the multi-phase inverter driver, the PFC circuit, and the PFC driver are situated on a package substrate of the power module package. The multi-phase inverter driver and the PFC driver can be in a common driver integrated circuit (IC). 1. A power module package comprising:a multi-phase inverter;a multi-phase inverter driver configured to drive said multi-phase inverter;a power factor correction (PFC) circuit, said PFC circuit configured to regulate a bus voltage of said multi-phase inverter;a PFC driver configured to drive said PFC circuit;said multi-phase inverter, said multi-phase inverter driver, said PFC circuit, and said PFC driver situated on a package substrate of said power module package.2. The power module package of claim 1 , wherein said multi-phase inverter driver and said PFC driver are in a common driver integrated circuit (IC).3. The power module package of claim 1 , comprising a PFC overcurrent protection circuit configured to provide over current protection to said PFC circuit.4. The power module package of claim 1 , comprising an inverter overcurrent protection circuit configured to provide over current protection to said multi-phase inverter.5. The power module package of claim 1 , wherein said multi-phase inverter is a three-phase inverter.6. The power module package of claim 1 , comprising a common fault terminal of said power module package configured to indicate an overcurrent condition of said PFC circuit and configured to indicate an overcurrent condition of said multi-phase inverter. ...

Redundancy Structures for Static Converters

The invention relates to a static converter connected between an electrical voltage source () and an electrical load (), said converter including a main static conversion arm () comprising an output electronic switching cell and a backup conversion arm () having identical structures. 1. A static converter for the conversion of electrical energy between a power voltage source and an electrical load comprising:a main static conversion arm comprising of at least one electronic switching cell with semiconductors equipped with associated control means, a first input terminal and a second power supply input terminal capable of being connected respectively to a first polarity and a second polarity of the power source, an output terminal connected to an output switching cell and suitable for being connected to the electrical load, each switching cell being configured through its associated control means to be active in a predetermined nominal mode of the converter,a pair of isolation components, associated with the main switching arm, formed of a first isolation component and a second isolation component each forming a dipole, the first isolation component and the second isolation component being connected directly and respectively to the first terminal and to the second power supply input terminal of the main arm,an emergency back up conversion arm consisting of at least one electronic switching cell with semiconductors equipped with associated control means, a first input terminal and a second power supply input terminal, suitable for being connected respectively to the first polarity and the second polarity of the power source, an output terminal connected to an output switching cell, andan electronic semiconductor switching circuit having a connection element connected between the output terminal of the emergency back up arm and an input terminal of the main arm from among the first input terminal and the second input terminal of the main arm,{'b': 1', '2, 'the ...

POWER SUPPLY APPARATUS AND PRINTING APPARATUS

This invention is directed to a power supply apparatus and a printing apparatus, which have a function of easily relaxing an output voltage rise caused by an abrupt decrease in load current by a simple arrangement. In an embodiment of the invention, a dummy load is connected to some of power supply circuits included in the power supply apparatus. When an input voltage from a DC power supply falls below a predetermined threshold value, a power supply from the power supply circuit to an integrated circuit to which an electric power is supplied is stopped in synchronism with a reset signal output to the integrated circuit. At this time, an electric power from the power supply circuit is partially supplied to the dummy load, thereby relaxing an abrupt variation of the output voltage. 1. A power supply apparatus for supplying an electric power to respective units of an apparatus based on a DC power supply generated from a commercial power supply , comprising:a monitor unit configured to monitor an input voltage of the DC power supply;a reset signal configured to output a reset signal to an integrated circuit to which the electric power is supplied when the input voltage monitored by said monitor unit falls below a predetermined threshold value;a power supply circuit configured to stop supply of the electric power to the integrated circuit in synchronism with outputting of the reset signal; anda relaxation circuit, which is connected to an output of said power supply circuit, and is enabled simultaneously with outputting of the reset signal, configured to relax an output voltage variation from said power supply circuit.2. The apparatus according to claim 1 , wherein said power supply circuit includes a first power supply circuit and a second power supply circuit having different output voltages claim 1 , andsaid relaxation unit is connected to one of said first power supply circuit and said second power supply circuit.3. The apparatus according to claim 2 , wherein said ...

DRIVER CIRCUIT AND INVERTER CIRCUIT

The present invention provides a safe circuit that can prevent an arm short, when a half-bridge circuit is configured by using a normally-on switching element, and the half-bridge circuit is used as a driver circuit or an inverter circuit. In a driver circuit configured by a half-bridge circuit in which one of input and output terminals of a first switching element is connected to a first power-supply voltage V on a high-voltage side, and the first switching element and a second switching element are connected in series, a normally-off third switching element is inserted between the second switching element and a second power-supply voltage V on a low voltage side. The third switching element is turned off, when an operating voltage VH or VL supplied from control-circuit power supplies and is insufficient for the operation of a control circuit 1. A driver circuit that includes a first switching element having a pair of input-output terminals , one end of which is connected to a first power-supply voltage , and a second switching element connected in series to the other end of the pair of input-output terminals of the first switching element , and that outputs a voltage of an intermediate node between the first switching element and the second switching element ,the first and the second switching elements including wide-gap semiconductor, and having a normally-on characteristic, the driver circuit comprising:a third switching element having a normally-off characteristic, and having a pair of input-output terminals, one end of which is connected to one end, not connected to the first switching element, of the input-output terminals of the second switching element, and the other end of which is connected to a second power-supply voltage lower than the first power-supply voltage;a first control circuit that outputs a first control signal for controlling on/off of the first switching element to a control terminal of the first switching element based upon an input signal; ...

POWER CONVERSION APPARATUS

When an overcurrent detection section detects an overcurrent, a control circuit performs ON-OFF control for switching devices each switchable between a forward direction and a reverse direction, in a mode in which a current having flowed is reduced, such that when the mode is a mode in which a current is passed through any of diodes, a switching device connected in parallel with the current-passed diode is turned ON. Thus, even when an overcurrent occurs, the current flowing in the diode connected in parallel with the switching device is reduced, and the diode is protected from being deteriorated or broken by the overcurrent. 1. A power conversion apparatus comprising:a positive electrode and a negative electrode constituting first input-output terminals; andupper arms and lower arms connected in series with each other between the positive electrode and the negative electrode of the first input-output terminals, whereinseries connection points between the upper arms and the lower arms are connected to second input-output terminals,each of the upper arms and the lower arms includes switching devices switchable between a forward direction and a reverse direction and diodes connected in parallel with the switching devices,the power conversion apparatus includes a control circuit for performing ON-OFF control for the switching devices, current detectors for detecting current flowing in connection portions between the series connection points and the second input-output terminals, and an overcurrent detection section for detecting that a current detection value from the current detectors exceeds a predetermined overcurrent setting value, andwhen the overcurrent detection section detects an overcurrent, the control circuit switches the ON-OFF control for the switching devices to a current reduction ON-OFF control mode which is a mode in which a current having flowed is reduced and in which when the mode is a mode in which a current is passed through any of the diodes, the ...

FREQUENCY CONVERTER AND METHOD FOR IDENTIFYING AND BLOCKING A FAULT CURRENT IN A FREQUENCY CONVERTER

In a frequency converter operated for safety of personnel and/or fire protection via a ground fault interrupter is frequently not able to distinguish between an actual fault current and an operationally generated leakage current. The proposed method addresses this problem by determining a course of a magnitude of a current flowing through the frequency converter, predefining a signal portion which is independent of switching processes within the frequency converter while the frequency converter operates fault-free, checking whether the determined course satisfies a criterion that is predetermined depending on the signal portion, and interrupting the current the determined course fails to satisfy the predetermined criterion. 1. A method for at least one of identifying and blocking a fault current in a frequency converter , comprising the steps of:determining a course of a magnitude of a current flowing through the frequency converter;for the determined course, predefining a signal portion which is independent of switching processes within the frequency converter while the frequency converter operates fault-free,checking whether the determined course satisfies a criterion that is predetermined depending on the signal portion, and interrupting the current the determined course fails to satisfy the predetermined criterion.2. The method of claim 1 , further comprising the step of determining a course of a magnitude of a differential current between at least two phase conductors of the frequency converter.3. The method of claim 1 , wherein the predefined signal portion comprises at least one spectral band.4. The method of claim 1 , wherein the predefined signal portion comprises at least one time segment.5. The method of claim 1 , further comprising the steps of:monitoring a switching signal for semiconductor power switches of the frequency converter, anddepending of the monitored switching signal, checking at least one time segment of the determined course of the ...

MULTILEVEL POWER CONVERTER

Aspects of the invention address a circumstance in multilevel power converter devices having a bidirectional switch connected to a middle point of a DC power supply assembly, whereby interruption of the device may cause break down of semiconductor switches due to overvoltage if the semiconductor switches are totally interrupted simultaneously. In some aspects, a shut down procedure of a multilevel power converter device having a bidirectional switch connected to the middle point of a DC power supply assembly, gates of semiconductor switches are interrupted one by one according to a predetermined sequence or a sequence corresponding to the conditions of voltage and current at that moment with a time interval, and finally the bidirectional switch connected to the middle point of a DC power supply assembly is interrupted. As a result, a transition from an operating state to a shut down state can be made with minimum voltage variation. 1. A multilevel power converter , for converting DC power to AC power or AC power to DC power , comprising:a DC power supply assembly having a positive terminal, a negative terminal, and a middle point terminal at a middle electric potential between the positive terminal and the negative terminal; and a series-connected semiconductor switch circuit of at least four semiconductor switches each having an antiparallel-connected diode, the series-connected semiconductor switch circuit being connected between the positive terminal and the negative terminal of the DC power supply assembly,', 'a bidirectional switch capable of bidirectional switching connected between the middle point terminal of the power supply assembly and an intermediate connection point of the series-connected semiconductor switch circuit, and', 'a circuit including a one or more semiconductor switches connected between each of two output terminals outputting a potential of each connection point of the semiconductor switches in the series-connected semiconductor switch ...

Procedures for the Operation of an Electrical Circuit

A method for operating an electrical circuit is described herein. The circuit includes a power converter having a plurality of switches and two capacitors that are parallel to the switches. The plurality of switches and the two capacitors are connected in series. The power converter has two AC voltage-sided connections and a measuring resistor is connected to the ground. A ground fault is detected by measuring a voltage drop in a measuring resistor. 1. A method for operating an electrical circuit having a power converter including a plurality of switches connected in series with one another and two capacitors connected in series , the two capacitors being connected to one another in parallel to the plurality of switches , the power converter having two AC voltage-sided connections and a measuring resistor connected to the two capacitors , the measuring resistor being connected to ground , the method comprising:measuring a voltage drop in the measuring resistor;determining whether the presence of a ground fault based on the measured voltage drop; andcontrolling the switches of the power converter such that the same potential is present in the AC voltage-sided connections and such that the potential changes from a first value to a second value.2. The method as in claim 1 , further comprising comparing a voltage curve of the measured voltage to an ideal voltage curve after the potential switches from the first value to the second value.3. The method as in claim 2 , further comprising inferring the presence of a ground fault when a significant deviation between the measured voltage curve and the ideal curve is detected.4. The method as in claim 2 , further comprising generating the ideal curve based on the voltage curve of the measured voltage without a ground fault present.5. The method as in claim 2 , further comprising generating the ideal curve based upon at least one of calculations or empirical data.6. The method as in claim 1 , further comprising measuring ...

POWER CIRCUIT

A power circuit includes a first and a second switches between a input terminal and a reference power source; an inductor between a output terminal and a node between the first and the second switches, a main capacitor coupled to the output terminal, a main switch between the inductor and the output terminal, a sub capacitor coupled to a node between the inductor and the main switch through a sub switch, and a control circuit. And the control circuit performs: switching operation of the first and the second switches, and suspension operation that maintains an off-state of the first and the second switches after switching operation; the switching operation on the main capacitor by switching on the main switch; the switching operation on the sub capacitor by switching on the sub switch; and the switching operation by switching on the main switch and the sub switch. 1. A power circuit comprising:an input terminal configured to input an input current;an input capacitor coupled to the input terminal and configured to accumulate electric charge by the input current;an overvoltage protection circuit coupled to the input terminal and configured to perform clamp operation to clamp a voltage of the input terminal to a clamp voltage;a first switch and a second switch coupled in series between the input terminal and a reference power source;an inductor disposed between a first connection node located between the first switch and the second switch and an output terminal;a main output capacitor coupled to the output terminal;a main output switch disposed between the inductor and the output terminal;a sub-output capacitor coupled to a second connection node located between the inductor and the main output switch through a sub-output switch; anda control circuit coupled to the input terminal and configured to control the first switch, the second switch, the main output switch and the sub-output switch,wherein the control circuit performs:switching operation that repeats on-off and ...

SWITCHING CONTROL CIRCUIT WITH SIGNAL PROCESS TO ACCOMMODATE THE SYNCHRONOUS RECTIFIER OF POWER CONVERTERS

A switching control circuit of a power converter according to the present invention comprises an input circuit and a clock generator. The input circuit is coupled to receive a feedback signal for generating a switching signal. The clock generator generates a clock signal to determine a switching frequency of the switching signal. The feedback signal is correlated to an output of the power converter. The switching signal is coupled to switch a transformer of the power converter for regulating the output of the power converter. The pulse width of the switching signal is reduced before the switching frequency of the switching signal is changed from a low frequency to a high frequency. 1. A switching control circuit of a power converter , comprising:an input circuit coupled to receive a feedback signal for generating a switching signal; anda clock generator generating a clock signal to determine a switching frequency of the switching signal;wherein the feedback signal is correlated to an output of the power converter; the switching signal is coupled to switch a transformer of the power converter for regulating the output of the power converter; the pulse width of the switching signal is reduced before the switching frequency of the switching signal is changed from a low frequency to a high frequency.2. The circuit as claimed in claim 1 , wherein the pulse width of the switching signal is reduced before the switching signal is disabled.3. The circuit as claimed in claim 1 , wherein the pulse width of the switching signal is decreased to a specific value before the switching signal is disabled for the protection of the power converter.4. The circuit as claimed in claim 1 , wherein the input circuit further comprises a micro-stepping circuit to modulate the pulse width of the switching signal step by step in response to the feedback signal.5. The circuit as claimed in claim 4 , wherein the input circuit further comprises a feedback circuit claim 4 , the feedback circuit ...

Methods, Systems, and Software For Controlling a Power Converter During Low (Zero)-Voltage Ride-through Conditions

A power converter control system having a phase tracker that is designed and configured to estimate the phase of the voltage on the power network that will be on the network when network recovers from a fault on the network. Such a power converter control system allows a power-network-connected power source to ride-through a fault event and continue supplying power thereto at the designed phase and frequency. In one embodiment, the phase tracker provides this estimate by having a response time slow enough that the voltage drop or sag caused by the fault substantially does not affect the control system. In another embodiment, the phase detector is designed and configured to freeze the frequency of its output upon detection of a fault event on the power network. 1. A machine-readable storage medium containing machine-executable instructions for performing a method of controlling an alternating-current (AC) output of a power converter connected to an AC power network subject to a voltage fault that causes a network voltage on the AC power network to drop below a normal operating level during a fault period , said machine-executable instructions comprising:a first set of machine-executable instructions for estimating a phase angle of a voltage anticipated to be present on the AC power network when the network voltage recovers from the voltage fault; anda second set of machine-executable instructions for controlling a current of the AC output during the voltage fault as a function of the phase angle estimated;wherein the network voltage has an amplitude and said first set of machine-executable instructions includes machine-executable instructions for tracking the phase with a response time and machine-executable instructions for changing the response time in inverse proportion to the amplitude of the network voltage.2. A machine-readable storage medium according to claim 1 , wherein the power converter is required to remain connected to the AC power network during a ...

Overload detection in a switched mode power supply

A switched mode power supply includes a switching device, the switched mode power supply being operable to convert an input voltage (V in ) to an output voltage (V out ) by switching the switching device, and a voltage regulator operable to generate a feedback signal based on at least one of the output voltage and an output current of the switched mode power supply. The power supply further comprises an overload detector, which is arranged to receive the feedback signal and operable to determine whether the feedback signal is outside a predetermined range. If the feedback signal is outside the predetermined range, the overload detector is operable to determine that the switched mode power supply is in an overload state, and when an overload state is determined, perform control to place the switched mode power supply in a non-operational state.

SYSTEM AND METHOD PROVIDING OVER CURRENT AND OVER POWER PROTECTION FOR POWER CONVERTER

System and method for protecting a power converter. A system includes a threshold generator configured to generate a threshold signal, and a first comparator configured to receive the threshold signal and a first signal and to generate a comparison signal. The first signal is associated with an input current for a power converter. Additionally, the system includes a pulse-width-modulation generator configured to receive the comparison signal and generate a modulation signal in response to the comparison signal, and a switch configured to receive the modulation signal and adjust the input current for the power converter. The threshold signal is associated with a threshold magnitude as a function of time. The threshold magnitude increases with time at a first slope during a first period, and the threshold magnitude increases with time at a second slope during a second period. The first slope and the second slope are different. 1. A system for protecting a power converter , the system comprising:a threshold generator configured to generate a threshold signal;a first comparator configured to receive the threshold signal and a first signal and to generate a comparison signal, the first signal being associated with an input current for a power converter;a pulse-width-modulation generator configured to receive the comparison signal and generate a modulation signal in response to the comparison signal;a switch configured to receive the modulation signal and adjust the input current for the power converter; the threshold signal is associated with a threshold magnitude as a function of time;', 'the threshold magnitude increases with time at a first slope during a first period;', 'the threshold magnitude increases with time at a second slope during a second period;', 'the first slope and the second slope are different., 'wherein2. The system of wherein the threshold magnitude is periodic with a threshold period claim 1 , the threshold period including at least the first period ...

PRINTED CIRCUIT BOARD

A power source circuit includes a switching circuit that converts a direct current voltage obtained by converting an alternating voltage from an alternating power source input through a pair of power supply lines and into a predetermined direct current voltage by a switching operation. A fuse is provided on one power supply line A series circuit including a first line bypass capacitor and a resistor element is connected between one power supply line and a ground A second line bypass capacitor is connected between the other power supply line and the ground . Imbalance of the circuit by an excess current protection element is prevented to reduce common mode noise. 1. A power source circuit comprising:a pair of power supply lines;a ground line;a power conversion circuit converting an alternating voltage inputted through the pair of power supply lines into a direct current voltage by a switching operation; andan excess current protection element provided on a one of the pair of power supply lines, whereina series circuit comprising a first line bypass capacitor and a resistor element serially connected is arranged between the ground line and the one of the pair of power supply lines,a second line bypass capacitor is arranged between the ground line and the other of the pair of power supply lines,capacitances of the first and second line bypass capacitors are set to be equal, and {'br': None, 'i': L/', 'C≦r≦', 'L/', 'C, '1003100, wherein'}, 'a resistance value r [Ω] of the resistor element meets a relationL [H] is an inductance value of the excess current protection element, andC [F] is a capacitance value of each of the first and second line bypass capacitors.2. The power source circuit according to claim 1 , wherein the resistance value r of the resistor element meets a relation:{'br': None, 'i': r=L/', 'C., '50'} The present invention relates to a power source circuit that reduces a high frequency noise generated by a switching operation.Conventionally, an electronic ...

Pulse Generator Circuit Arrangement And Method For Generating Pulsed Signals For Insulation Fault Location In IT Networks

A pulse generator circuit arrangement for the search for insulation faults in IT networks includes a rectifier circuit for transforming an IT network voltage into a DC intermediate circuit and switching elements having a trigger signal input for switching on and off a DC intermediate circuit voltage. A circuit device downstream of the switching elements generates a pulsed current to be supplied to the IT network. The circuit arrangement includes a control and evaluating logic for determining the insulation resistance of the IT network and also a circuit device for generating the pulsed current, which is formed as a current regulating device and allows a dynamic adjustment of the pulsed current depending on the determined insulation resistance. 1. A pulse generator circuit arrangement for insulation fault location in IT networks , said circuit arrangement comprising:a rectifier circuit transforming an IT network voltage into a DC intermediate circuit;switching elements having a trigger signal input for switching on and off a voltage of the DC intermediate circuit;a circuit device downstream of the switching elements generating a pulsed current to be supplied to the IT network;control and evaluating logic determining an insulation resistance of the IT network; anda circuit device generating the pulsed current, which is formed as a current regulating device which allows a dynamic adjustment of the pulsed current depending on the determined insulation resistance.2. A circuit arrangement according to claim 1 , in which for the dynamic adjustment of the pulsed current claim 1 , the current regulating device has a regulating logic which is connected on an input side to a current measuring device for determining an actual current value of the IT network and also to the control and evaluating logic for including a target current value derived from the insulation resistance and which on an output side provides a correcting value which changes the actual current value via an ...

Sub-module of a modular multi-stage converter

A sub-module for a modular multi-stage converter has an energy store and a power semiconductor series circuit connected in parallel to the energy store. In the semiconductor series circuit, two power semiconductor switches that can be activated and deactivated and have the same forward direction are connected in series. A free-wheeling diode is connected in parallel and in the opposite direction to each power semiconductor switch. A first connection terminal is connected to the energy store. A second connection terminal is connected to a potential point between the power semiconductor switches and to the free-wheeling diodes thereof. A bridging switch is disposed between the connection terminals for bridging the sub-module. The power semiconductors thereof are not destroyed upon closing the bridging switch and at least one connection terminal and/or a bridging branch that connects the two connection terminals to each other has an inductive component.

POWER FACTOR CORRECTION (PFC) POWER CONVERSION APPARATUS AND POWER CONVERSION METHOD THEREOF

A power factor correction (PFC) power conversion apparatus and a power conversion method thereof are provided. In the invention, by switching a detection switch disposed inside a control chip and connected to a detection pin of the control chip at a certain time, and performing a detection of an input voltage received by a boost power conversion circuit at the certain time through a collocation between a current detection auxiliary circuit and a current detection main circuit. Accordingly, an over current protection (OCP) point corresponding to whether an OCP mechanism is activated is compensated according to the detected result, and thus the detection manner of the OCP performed by the invention can be adaptively suitable for different input voltages. In the invention, according to the detected result, a brown out protection also can be performed, and the output of the boost power conversion circuit also can be changed or determined. 1. A power factor correction power conversion apparatus , comprising:a boost power conversion circuit, configured to receive an input voltage and convert the input voltage in response to a pulse width modulation signal, so as to generate and provide an output voltage;a control chip, coupled to the boost power conversion circuit, configured to generate the pulse width modulation signal in response to a power supplying requirement to control an operation of the boost power conversion circuit; anda current detection auxiliary circuit, coupled to the boost power conversion circuit and a detection pin of the control chip, configured to assist the control chip to perform a detection of the input voltage in a detection phase,wherein the control chip compensates, in response to a first detection result of the detected input voltage, an over current protection point corresponding to whether an over current protection mechanism is activated.2. The power factor correction power conversion apparatus as claimed in claim 1 , wherein the boost power ...

Voltage rectifier

A voltage rectifier rectifies an alternating current voltage to a direct current voltage. The voltage rectifier includes an input port for receiving the alternating current voltage; an output port for outputting the direct current voltage; a lightning protection unit; a rectifying unit; a filtering unit; a first fuse; and a second fuse. The input port, the lightning protection unit, the rectifying unit, the filtering unit, the output port are connected in series. The first fuse is connected between the input port and the lightning protection unit; the second fuse is connected between the lightning protection unit and the rectifying unit or the second fuse is connected between the rectifying unit and the filtering unit.

PROTECTION CONTROL SYSTEM FOR A MULTILEVEL POWER CONVERSION CIRCUIT

Aspects of the invention are directed to a protection control system of the invention is a protection control system for a multilevel power conversion circuit of a flying capacitor type, the power conversion circuit including six semiconductor switches of first through sixth semiconductor switches sequentially connected in series from a positive terminal to a negative terminal of a DC power supply, a first capacitor connected between the connection point of the second and third semiconductor switches and the connection point of the fourth and fifth semiconductor switches and a second capacitor connected between the connection point of the first and second semiconductor switches and the connection point of the fifth and sixth semiconductor switches, wherein the protection control system of the invention turns ON the second semiconductor switch or maintains the second semiconductor switch in an ON state, in the case of short-circuit fault of the third semiconductor switch. 3. The protection control system for a multilevel power conversion circuit according to claim 1 , wherein the second or fifth semiconductor switch is turned OFF when the voltage across the second capacitor decreases to a predetermined voltage value after the second or fifth semiconductor switch has been turned ON.4. The protection control system for a multilevel power conversion circuit according to claim 3 , wherein the predetermined voltage value is approximately 50% of a voltage value of the DC power supply.5. The protection control system for a multilevel power conversion circuit according to claim 3 , wherein the multilevel power conversion circuit is a multilevel power conversion circuit of a flying capacitor type in combination with a neutral point clamped circuit that is additionally provided and composed of a semiconductor switch for clamping the electric potential of the second capacitor at a neutral point electric potential of the DC power supply claim 3 , and the predetermined voltage ...

FLYBACK-BASED POWER CONVERSION APPARATUS AND POWER CONVERSION METHOD THEREOF

A flyback-based power conversion apparatus and a power conversion method thereof are provided. By switching first and second detection switches disposed in a control chip and coupled to a multi-function pin of the control chip at different timings, the present invention applies a collocation of a voltage-current detection auxiliary circuit and a current detection circuit at a certain timing to execute a detection of the AC input voltage received by a flyback power conversion circuit, and the present invention applies a collocation of the auxiliary voltage-current detection circuit, an over temperature protection unit and an over voltage protection unit at another timing to execute detections of an over temperature protection and an over voltage protection. As the result, a single multi-function detection pin of the control pin is corresponding to a plurality of related function detections, so as to reduce the production cost of manufacturing the control chip. 1. A power conversion apparatus , comprising:a flyback power conversion circuit, configured to receive an alternating current (AC) input voltage, and convert the AC input voltage in response to a pulse width modulation (PWM) signal, so as to generate and provide a direct current (DC) output voltage;a control chip, coupled to the flyback power conversion circuit, and configured to generate the PWM signal in response to a power supply requirement so as to control an operation of the flyback power conversion circuit; anda voltage-current detection auxiliary circuit, coupled to the flyback power conversion circuit and a multi-function detection pin of the control chip, configured to assist the control chip in executing a detection of the AC input voltage through the multi-function detection pin in a first detection phase, and configured to assist the control chip in executing detections of an over temperature protection and an over voltage protection through the multi-function pin in a second detection phase.2. The ...

Method In A Voltage Source Chain-Link Converter, Computer Programs And Computer Program Products

A method in a voltage source chain-link converter. The method includes: detecting a failure of a device of one converter cell module; blocking a phase-leg including the failed position; discharging to zero a capacitor unit of the converter cell module including the failed position; and providing a current path for the phase current through the converter cell module with the failed position, the current path including a first branch, in turn including corresponding positions of the first phase-leg and the second phase-leg in the full H-bridge arrangement, the first branch being connected in parallel to a second branch including the failed position, the second branch including the remaining two positions of the full H-bridge arrangement. The invention also encompasses corresponding computer program and computer program products. 1. A method in a voltage source chain-link converter comprising one or more phases , each phase comprising a number of series-connected full bridge converter cell modules comprising four valves , each valve comprising a semi-conductor switch , the valves being connected in a full H-bridge arrangement with a capacitor unit , each semi-conductor switch having a respective free-wheeling diode connected in parallel thereto , each full H-bridge arrangement comprising a first phase-leg and a second phase-leg , the method comprising the steps of:detecting a failure of a position of one of the converter cell modules, the failed position comprising a failed semi-conductor switch, failed free-wheeling diode or failed gate unit,blocking the phase-leg comprising the failed position,discharging to zero the capacitor unit of the converter cell module comprising the failed position, and{'b': 30', '31, 'providing a current path for the phase current through the converter cell module with the failed position, the current path comprising a first branch, in turn comprising corresponding positions of the first phase-leg and the second phase-leg in the full H- ...

Alternative Power Converter System

An energy power converter system is provided. According to one embodiment, the system includes a plurality of parallel converters; a main transformer with a separate magnetic path for magnetic fields are generated in the transformer by a summation of currents coming from the plurality of parallel converters electrically coupled to the main transformer; and a converter control device electrically coupled to the plurality of parallel converters and the main transformer. The converter control device may be configured to discontinue electrical flow in the system based at least in part on detection of an electrical fault condition.

MOTOR DRIVE DEVICE

A motor drive device for driving a motor, which has a plurality of winding pairs, includes a plurality of inverter units for the plurality of winding pairs. The inverter units are coupled in parallel to a power source. A plurality of capacitors provided for the plurality of inverter units, and a plurality of power relays are disposed between the power supply and the inverter units. In particular, a power relay is provided for each of the inverter units. A control unit detects a short failure of the power relay, and simultaneously turns ON the power relays that do not have a short failure. In such manner, damage to the power relays as well as damage to other electronic components of the motor driver device due to a large electric current is prevented. 1. A motor drive device for driving a motor , which has a plurality of winding pairs , the motor drive device comprising:a plurality of inverter units for the plurality of winding pairs, the plurality of inverter units coupled to a power supply in parallel to each other;a plurality of capacitors coupled to the plurality of inverter units;a plurality of power relays disposed between the power supply and the plurality of inverter units; anda control unit having a drive control unit and a failure detection unit, the driver control unit controlling a drive of the inverter units and a drive of the power relays, and the failure detection unit detecting a short failure of the power relays, wherein the drive control unit simultaneously turns ON the power relays that are detected by the failure detection unit as not having the short failure.2. The motor drive device of further comprising:a plurality of reverse connection protection relays disposed between the power relay and the plurality of inverter units, whereinthe drive control unit controls the drive of the reverse connection protection relays,the power relay and the reverse connection protection relay are semiconductor elements having a parasitic diode, andthe parasitic ...

POWER GENERATION SYSTEM, POWER CONVERTER SYSTEM, AND METHODS OF OPERATING A POWER CONVERTER SYSTEM

A power converter system includes a converter configured to be coupled to a power generation unit for receiving power from the power generation unit, and a bus coupled to the converter, wherein a voltage is generated across the bus when electricity is conducted through the power converter system. The power converter system also includes an inverter coupled to the bus, wherein the inverter is configured to supply power to an electrical distribution network. A control system is coupled to at least one of the converter and the inverter, wherein the control system is configured to adjust an operation of the at least one of the converter and the inverter to reduce the voltage across the bus during at least one of a low voltage event and a high voltage event. 1. A power converter system comprising:a converter configured to be coupled to a power generation unit for receiving power from the power generation unit;a bus coupled to the converter, wherein a voltage is generated across the bus when electricity is conducted through the power converter system;an inverter coupled to the bus and configured to supply power to an electrical distribution network; and,a control system coupled to at least one of the converter and the inverter, the control system configured to adjust an operation of the at least one of the converter and the inverter to reduce the voltage across the bus during at least one of a low voltage event and a high voltage event.2. The power converter system in accordance with claim 1 , wherein the control system is configured to operate the converter to reduce the power received from the power generation unit during the at least one of a low voltage event and a high voltage event.3. The power converter system in accordance with claim 1 , wherein the inverter comprises at least one switch claim 1 , the control system is configured to disable the at least one switch during the at least one of a low voltage event and a high voltage event.4. The power converter system ...

Supply voltage control

A disconnect device for a switched-mode power supply, including an activation device for a first transistor for generating a transformable voltage. The device includes a second transistor of the PNP type and a third transistor of the NPN type, the base of the second transistor being connected to the collector of the third transistor and the base of the third transistor being connected to the collector of the second transistor. The emitter of the third transistor is connected to ground. The emitter of the second transistor is connected to a control voltage terminal of the activation device, the control voltage terminal being configured for suppressing the generation of the voltage by the first transistor, if the control voltage terminal is connected to ground, so that the generation of the voltage is suppressed if the base of the third transistor is acted upon by a voltage exceeding a predetermined threshold value.

APPARATUS AND METHODS FOR RESTORING POWER CELL FUNCTIONALITY IN MULTI-CELL POWER SUPPLIES

A method is provided for operating a multi-cell power supply that includes multiple series-connected power cells in each of multiple legs. Each power cell includes a bypass device that may be used to selectively bypass and de-bypass the power cell. After a first power cell faults and is bypassed as a result of the fault, the method includes de-bypassing the first power cell without stopping the multi-cell power supply if the first power cell fault was caused by a predetermined operating condition. Numerous other aspects are provided. 1. A method of operating a multi-cell power supply comprising a plurality of series-connected power cells in each of a plurality of legs , each power cell comprising a bypass device that may be used to selectively bypass and de-bypass the power cell , wherein after a first power cell faults and is bypassed as a result of the fault , the method comprises:de-bypassing the first power cell without stopping the multi-cell power supply if the first power cell fault was caused by a predetermined operating condition.2. The method of claim 1 , wherein the predetermined operating condition comprises any of an overvoltage condition claim 1 , an over-temperature condition claim 1 , and a line disturbance.3. The method of claim 1 , further comprising determining if the predetermined operating condition no longer exists prior to de-bypassing the first power cell.4. The method of claim 1 , further comprising determining if the bypassed power cell is functional prior to de-bypassing the first power cell.5. The method of claim 1 , wherein each of the legs is connected between a node and a respective line claim 1 , and the multi-cell power supply comprises line-to-line voltage outputs between pairs of the legs claim 1 , and wherein the method further comprises:controlling the plurality of power cells to maximize the line-to-line voltage outputs and maintaining the line-to-line voltage outputs substantially equal in magnitude.6. The method of claim 5 , ...

Method for the operation of an inverter, and inverter

The invention relates to a method for operating an inverter ( 1 ), in particular a pulse-controlled inverter, comprising multiple phase systems ( 2, 3, 4 ), each of which has an outer conductor ( 7, 8, 9 ) and at least one semiconductor component ( 12, 13 ), and a temperature monitoring device ( 15 ) that has multiple temperature sensors ( 16, 17, 18 ) which sense the temperature of at least one part of at least one of the phase systems ( 2, 3, 4 ). In said method, a temperature gradient is determined from each of the sensed temperatures, the difference of the determined temperature gradients from each other is ascertained, and if the difference exceeds at least one threshold value, a fault of a cooling device of the inverter ( 1 ) is identified. The invention further relates to an inverter ( 1 ).

Power Converter

A power converter includes an inverter unit that includes a plurality of semiconductor switching elements constituting upper and lower arms and converts DC power into AC power; a gate driving unit that outputs, to the inverter unit, a gate signal used to drive gates of the plurality of semiconductor switching elements; a driving control unit that supplies the gate driving unit with a switching control signal used for the gate driving unit to output the gate signal; a first abnormality detection unit that performs over voltage detection of the DC power and over current detection of the AC power and temperature detection of the upper and lower arms; and a second abnormality detection unit that detects abnormality of the plurality of semiconductor switching elements of the upper arm and lower arms, wherein the driving control unit includes a first protection circuit and a second protection circuit. 1. A power converter comprising:an inverter unit that includes a plurality of semiconductor switching elements constituting an upper arm and a plurality of semiconductor switching elements constituting a lower arm, and converts DC power into AC power and outputs the AC power;a gate driving unit that outputs, to the inverter unit, a gate signal used to drive gates of the plurality of semiconductor switching elements of the upper and lower arms and turn on/off the semiconductor switching elements;a driving control unit that supplies the gate driving unit with a switching control signal used for the gate driving unit to output the gate signal;a first abnormality detection unit that detects abnormality of the inverter unit by performing over voltage detection of the DC power and over current detection of the AC power and temperature detection of the upper and lower arms; anda second abnormality detection unit that detects the abnormality of the inverter unit by detecting abnormality of each of the plurality of semiconductor switching elements constituting the upper arm and the ...

RAPID ONLINE DIAGNOSIS METHOD OF OPEN-CIRCUIT FAULT FOR HIGH-POWER RECTIFIER

The invention relates to rapid online diagnosis method of high-power rectifier open-circuit fault, including: 1) collecting actual output direct current value i(t) and three phase input electric current instantaneous values i(t), i(t) and i(t) of rectifier at tmoment, and calculating theoretical output direct current value i′ of the rectifier according to i(t), i(t) and i(t); 2) comparing i′ (t) and i(t), when i′ (t) is not more than k1×i(t), comparing absolute value of maximal three phase input electric current instantaneous value and pre-set threshold value A, if the maximal three phase input electric current instantaneous value is not less than A, the rectifier appears open-circuit fault. The inventive method is simple, with no complicated step for performing fault diagnosis, of course, the short fault diagnosis period and tripping protection occupation time is short, but it also can protect the rectifier effectively and prevent equipment damage from longtime working under fault condition. 1. A rapid online diagnosis method of open-circuit fault for high-power rectifier , being characterized in that , the rapid online diagnosis method includes the steps of:1) collecting present actual value of output direct current for the rectifier and present instantaneous value of three phase input electric current for the rectifier, and calculating present theoretical value of output direct current for rectifier according to the present instantaneous value of three phase input electric current; and{'sub': 1', '1, '2) comparing the actual value of output direct current with the theoretical value of output direct current, when the theoretical value of output direct current is not more than k1 times of the actual value of output direct current, instantaneous value of a direct current component in the three phase input electric current is calculated, then comparing absolute value of maximal one in instantaneous value of the direct current component with a first pre-set threshold ...

Power Electronic Converter with a Ground Fault Detection Unit that Shares a Common Ground with both DC Ports and AC Ports

This invention discloses a power electronic converter that streamlines the detection, monitoring, and protection of ground faults. The converter has at least one DC leg with each having a DC port and a first DC bus, at least one AC leg with each having an AC port and a second DC bus, at least one DC-bus capacitor, a ground-fault detection unit, and a Protective Earth terminal that is connected to the earth. The DC port(s). AC port(s), and the ground-fault detection unit are connected together to share a commons ground, which is also the neutral line of the AC ports. The first DC bus(es) of the DC port(s) and the second DC bus(es) of the AC port(s) are connected together to form a converter DC bus with the DC-bus capacitor(s) connected to it. The ground-fault detection unit, connected between the common ground and the Protective Earth terminal, consists of a current sensor and a neutral ground resistor connected in series, together with a voltage sensor to measure the voltage between the Protective Earth terminal and the common ground. When the voltage of the Protective Earth terminal with respect to the common ground exceeds a certain value or when the current flowing through the ground-fault detection unit exceeds a certain value, a visual or audio warning signal is generated to warn the presence of a ground fault. A Residual Current Circuit Breaker or a Ground Fault Circuit Breaker can be connected to the AC port(s) to disconnect the converter in case of ground faults. Possible applications include any field that adopts power electronic converters that converts electricity between DC and AC, e.g., in wind power, solar power, storage systems, home appliances, IT equipment, motor drives, electric vehicles, more-electric aircraft, and all-electric ships. 1) A power electronic converter , comprising:at least one DC leg, each having a DC port and a first DC bus;at least one AC leg, each having an AC port and a second DC bus;at least one DC-bus capacitor;a ground-fault ...

Dc power attachment device

A DC power attachment device provides a convenient solution in adapting DC powers from AC sockets connected to an existing power distribution circuit. It enables multitude DC devices to concurrently access multiple DC powers at the same or at different voltages on the same power attachment device, which may be coupled to a DC power source, an existing socket, or directly connected to a DC power distribution circuit. The method on the assembly of a DC power attachment device is also addressed.

ABNORMALITY DETECTING SYSTEM FOR A SOLAR POWER GRID

A system is provided to be disposed between a solar power module and a power inverter. The solar power module outputs a solar power signal to the power inverter. The system includes a circuit protecting unit and a processor. The processor obtains an amount of electrical current outputted by the power inverter and an amount of electrical current flowing through a current detector of the circuit protecting unit. When it is determined that the amount of electrical current outputted by the power inverter is zero and the amount of the electrical current flowing through the current detector is non-zero, the processor controls a power switch of the circuit protecting unit to switch to an open circuit state. 1. An abnormality detecting system for a solar power grid , the abnormality detecting system to be disposed between a solar power module and a power inverter of the solar power grid , the solar power module including a solar panel , and a first output node and a second output node that cooperatively output a solar power signal in a form of a direct current signal , the power inverter being electrically connected to the solar power module to receive the solar power signal therefrom and being configured to convert the solar power signal to a converted power signal in a form of an alternating current (AC) signal and to output the converted power signal , the abnormality detecting system comprising: an input component including a first port and a second port that are configured to be electrically connected respectively to the first output node and the second output node, and being configured to receive the solar power signal from the solar power module through said first and second ports,', 'a power switch electrically connected to said first port,', 'an output component electrically connected between said power switch and the power inverter,', 'a current detector electrically connected between said input component and said output component, and configured to measure an ...

SYSTEM AND METHOD FOR USE WITH MICROGRIDS HAVING INVERTER-BASED DISTRIBUTED GENERATORS

A system and method for controlling microgrids composed of inverter-based distributed generation (IBDG) units. This includes a method using multiple IBDGs to inject impedance-modulated harmonic currents during fault conditions, with each IBDG injecting a unique, differentiable harmonic (i.e., non-fundamental) order from neighboring IBDGs. The method also involves using an inverse time-harmonic-current characteristic to detect faults by locally measuring the harmonic currents injected by IBDGs. A harmonic directional overcurrent relay is also used for fault detection. 1. A system for use with a microgrid having a plurality of inverter-based distributed generators , said system comprising:an injection unit embodied in a computer readable medium for providing each one of a plurality of inverters within said microgrid with a corresponding one of a plurality of differentiable harmonic currents upon a fault condition within said microgrid; anda measuring unit embodied in said computer readable medium for providing detection of said harmonic currents;wherein isolation of a faulted section of said microgrid is enabled based upon said harmonic currents detected.2. The system as claimed in claim 1 , wherein a directional unit embodied in said computer readable medium provides said isolation of said faulted section.3. The system as claimed in claim 2 , wherein said directional unit uses a ratio of said harmonic currents measured on both sides of a microprocessor-based relay within each inverter-based distributed generator to locate said faulted section.4. The system as claimed in claim 3 , wherein said harmonic currents are measured local to said microgrid.5. The system as claimed in claim 4 , wherein said plurality of differentiable harmonic currents vary by harmonic orders relative to adjacent ones of said plurality of inverter-based distributed generators along a common feeder.6. The system as claimed in claim 5 , wherein a backup protection unit embodied in said computer ...

In situ overvoltage protection for active bridge applications

An overvoltage protection device protects a half bridge circuit that receives a supply voltage. The overvoltage protection device includes a high speed overvoltage detector that receives the supply voltage, detects whether an overvoltage situation is present, and outputs an overvoltage signal that disables the switches of the half bridge circuit before the switches can be damaged by the overvoltage situation. With both the switches of the half-bridge disabled, the entire supply voltage appears across the two switches in series, by which each switch only receives half the entire voltage. Thus, by quickly disabling both switches of the half-bridge each switch only needs a maximum voltage rating equal to half the maximum voltage rating of the half bridge circuit as a whole. This leads to reduced size and cost for the switches of the half-bridge circuit.

Control circuit and method of a power converter

A feedback signal stabilized by a capacitor and related to an output voltage of a power converter is used to acquire the output power information of the power converter, and a control circuit uses a second clock not related to the switching frequency of the power converter to count a duration time of the feedback signal being higher than a threshold. When the duration time is higher than a preset time, an abnormal output power of the power converter is distinguished and the power converter will be turned off. The feedback signal will not vary severely even if the output terminal of the power converter is interfered, and the counted duration time will not be influenced when the switching frequency is changing caused by a load changing.

Control circuit and motor device

A control circuit includes: an input terminal for receiving an input AC voltage; a voltage decreasing unit for decreasing the input AC voltage; an A-D converter for converting the decreasing AC voltage to a DC voltage; a driving unit for receiving the DC voltage and to driving a motor, a detecting unit for detecting the DC voltage; and a current shunt unit configured to be conductive to lower the DC voltage at the output terminal of the A-D converter to a voltage which is less than a threshold voltage when the detecting signal indicates that the detected DC voltage exceeds the threshold value. A motor device includes the control circuit and a motor.

POWER SUPPLY APPARATUS WITH SOFT-START AND PROTECTION

A power supply apparatus with soft-start function is suitable to a load including a voltage stabilizing unit and a load unit coupled in parallel. The power supply apparatus includes a power unit, a soft-start adjusting unit, a current detecting unit and a controlling unit. The power unit generates a power voltage. The soft-start adjusting unit receives the power voltage, a first controlling signal and a second controlling signal, and transforms the power voltage to a soft-start current accordingly to output the soft-start current to the voltage stabilizing unit or output the power voltage to the voltage stabilizing unit. The current detecting unit measures a current of a loop formed between the power unit and the voltage stabilizing unit to generate a current detecting signal. The controlling unit receives the current detecting signal to generate the first controlling signal and second controlling signal. 1. A power supply apparatus with a soft-start function , suitable to supply a power to a load , the load comprising a voltage stabilizing unit and a load unit coupled in parallel , the power supply apparatus with the soft-start function comprising:a power unit, generating a power voltage;a soft-start adjusting unit, coupled to the power unit and suitable to couple to the voltage stabilizing unit, receiving the power voltage, a first controlling signal and at least one second controlling signal, and transforming the power voltage to a soft-start current according to the first controlling signal and the at least one second controlling signal, so as to output the soft-start current to the voltage stabilizing unit or output the power voltage to the voltage stabilizing unit;a current detecting unit, coupled to the power unit and suitable to couple to the voltage stabilizing unit, measuring a current of a loop formed between the power unit and the voltage stabilizing unit, so as to generate a current detecting signal; anda controlling unit, coupled to the current ...

Protection of switched capacitor power converter

Various embodiments of a fault detector for a voltage converter are described. In one example embodiment, briefly. the fault detector is capable to detect one or more fault events during operation of a voltage converter. Likewise, the fault detector is capable to generate one or more fault signals with respect to the one or more to be detected fault events. The one or more fault signals, in the example embodiment, to signal a disconnect switch of the voltage converter to electrically disconnect or otherwise via a high impedance state to limit current flow through at least one switch of a set of switches of the voltage converter. In another example embodiment, the fault detector, responsive to the one or more fault signals, capable to generate a bus interrupt signal on a pin out, such as of an integrated circuit (IC) for use with the voltage converter, or capable to toggle a fault indicator pin out of the IC. Other additional embodiments are also described.

ROTATING MACHINE POWER CONVERSION DEVICE

A rotating machine power conversion device is obtained which achieves operational continuation in a rotational speed range in which the operational continuation is enabled, even when a single phase of an electrical power conversion device made of switching devices causes a disconnection or turn-off failure. The rotating machine power conversion device comprises: a normality-case/abnormality-case current control device selection device for transferring between a normality-case current control device and an abnormality-case current control device in accordance with a determination result of an abnormality determination device; and an abnormality-case current control device/power conversion halt device selection device, using a rotational speed calculation device, for transferring between the abnormality-case current control device used when a rotational speed is lower than that being prespecified, and the power conversion halt device used when a rotational speed is higher than that being prespecified. 16-. (canceled)7. A rotating machine power conversion device , being mounted between a three-phase alternating-current rotating machine and a direct-current power source , and having an electrical power conversion device in which series-connected circuits of three phases connected in series with upper-side switching devices and lower-side switching devices each other are connected in parallel with the direct-current power source and in which midpoints between the upper-side switching devices and the lower-side switching devices in each of the series-connected circuits are individually connected to windings of each phase of the three-phase alternating-current rotating machine , for converting into alternating-current power thereto direct-current power from the direct-current power source , the rotating machine power conversion device comprising:a rotational speed calculation device for calculating a rotational speed of the three-phase alternating-current rotating machine; ...

Vehicle driving device

A vehicle driving device includes an inverter which drives a motor. The inverter includes: a three-phase bridge circuit including a plurality of switching elements; a three-phase short circuit which short-circuits three phases of the motor via the three-phase bridge circuit; and a control circuit. The control circuit includes: a microprocessor which drives the three-phase bridge circuit; a malfunction notification circuit which outputs a malfunction notification signal when the microprocessor is malfunctioning; and a latch circuit which holds the malfunction notification signal outputted from the malfunction notification circuit. The control circuit outputs a three-phase short-circuit drive signal which drives the three-phase short circuit, based on the malfunction notification signal held by the latch circuit.

Electrical Receptacle with Self Engaging Power Shut-Off Protection

Embodiments of the present disclosure include an electrical receptacle, comprising a base formed of electrically insulating material and arranged to hold at least one pair of electrically conductive terminals, and a cover formed of electrically insulating material and configured to be joinable with the base. The cover can comprise a top portion having a bottom surface, and at least one separating tab attached to the bottom surface at an angle of ˜90 degrees. Each separating tab can be arranged to separate opposite terminals, of a terminal pair, only when the cover is at least partially joined with the base. Base and cover can include, respectively, locking tabs and receptacles configured to engage when base and cover are fully joined. Embodiments also include power supply circuits comprising a DC-AC inverter, a load protection circuit, and embodiments of the electrical receptacle. Embodiments also include methods for protecting a power supply circuit. 1. An electrical receptacle , comprising:a base formed of electrically insulating material and arranged to hold at least one pair of electrically conductive terminals; and a top portion having a bottom surface; and', 'at least one separating tab attached to the bottom surface at an angle of approximately 90 degrees;, 'a cover formed of electrically insulating material and configured to be joinable with the base, the cover comprisingwherein each separating tab is arranged to separate two terminals comprising one of the pairs of electrically conductive terminals, only when the cover is at least partially joined with the base.2. The electrical receptacle of claim 1 , wherein the base further comprises:an inner portion arranged to hold the at least one pair of electrically conductive terminals; andan outer portion comprising four sides, wherein at least two of the sides comprise locking tabs.3. The electrical receptacle of claim 2 , wherein each adjacent pair of sides of the base outer portion are joined at an angle of ...

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 ...

POWER CONVERSION DEVICE AND CONTROL CIRCUIT

A power conversion device according to one or more embodiments may include: a microcomputer; and an output circuit controlled by the microcomputer, including an output unit that converts an input power into a predetermined power and outputs the predetermined power, an internal power source that supplies a power source to the microcomputer, a driver that drives the output unit by a signal from the microcomputer, and a microcomputer stop transition unit that, when an operation of the power conversion device is stopped, outputs a microcomputer stop signal to the microcomputer and causes an operation of the microcomputer to transition to a stop state. In one or more embodiments, after the microcomputer stop transition unit causes the operation of the microcomputer to transition to a stop state, the microcomputer or the output circuit may stop an output of the internal power source. 1. A power conversion device comprising:a microcomputer; and an output unit that converts an input power into a predetermined power and outputs the predetermined power,', 'an internal power source that supplies a power source to the microcomputer,', 'a driver that drives the output unit by a signal from the microcomputer, and', 'a microcomputer stop transition unit that, when an operation of the power conversion device is stopped, outputs a microcomputer stop signal to the microcomputer and causes an operation of the microcomputer to transition to a stop state, wherein, 'an output circuit controlled by the microcomputer, comprising'}after the microcomputer stop transition unit causes the operation of the microcomputer to transition to a stop state, the microcomputer or the output circuit stops an output of the internal power source.2. The power conversion device according to claim 1 , whereinwhen the microcomputer is in a state which allows the microcomputer to be stopped, the microcomputer outputs an internal power source stop signal to the internal power source, and transmits the internal ...

METHODS AND APPARATUS FOR AN INTEGRATED CIRCUIT

Various embodiments of the present technology may comprise methods and apparatus for an integrated circuit (IC). The methods and apparatus may comprise an integrated circuit comprising a sensor circuit and a driver circuit coupled to the sensor circuit. The driver circuit may include an amplifier configured to generate a bias voltage, a signal converter circuit coupled to the amplifier, and a control circuit coupled to the amplifier. The control circuit may comprise a switch responsive to a control signal and a transistor coupled to the switch. 1. An integrated circuit , comprising:a sensor circuit; and an amplifier configured to generate a bias voltage at a bias output terminal;', 'a signal converter circuit coupled to the amplifier, wherein the signal converter circuit comprises a digital-to-analog converter; and', a current mode; and', 'a voltage mode., 'a control circuit coupled to the amplifier and configured to selectively operate the driver circuit in one of], 'a driver circuit coupled to the sensor circuit and comprising2. The integrated circuit according to claim 1 , wherein the control circuit comprises:a plurality of switches, each responsive to a control signal; andat least one transistor coupled to at least one of the plurality of switches.3. The integrated circuit according to claim 1 , wherein the control circuit comprises: in series with a second switch; and', 'to the bias output terminal;, 'a first switch coupleda third transistor comprising a gate terminal, wherein the gate terminal is coupled to a node positioned between the first and second switches; anda third switch and a resistive element coupled between a reference voltage and the amplifier.4. The integrated circuit according to claim 1 , wherein the sensor circuit comprises a hall element configured to generate a hall signal in response to a magnetic field.5. The integrated circuit according to claim 1 , further comprising a switching circuit coupled to the sensor circuit and the driver ...

APPARATUS FOR OPENING OR CLOSING A DC CIRCUIT, AND METHOD FOR AUTOMATICALLY CLOSING A DC CIRCUIT

A device is for opening or closing a DC circuit with at least one busbar. The device includes an electric switch for opening or closing the DC circuit; a fault current detector; a trigger unit and a precharging device. The electric switch opens the DC circuit via the trigger unit upon a fault current being detected by the fault current detector. Further, the precharging device restores the voltage on the busbar prior to closing the electric switch. The device further includes a control unit for automatically closing the electric switch after the pre-charging process. 2. The apparatus of claim 1 , wherein the electrical switch is a semiconductor switch.3. The apparatus of claim 1 , further comprising:a communication unit.4. The apparatus of claim 1 , further comprising:a second control unit to suppress a switch-on transient.5. The apparatus of claim 1 , further comprising:a measurement unit to measure at least one of current and voltage values.6. The apparatus of claim 1 , wherein the pre-charging apparatus is configured to restore the voltage on the busbar after expiration of a first waiting time period.7. The apparatus of claim 3 , wherein the pre-charging apparatus is configured to restore the voltage on the busbar after receiving a command.8. The apparatus of claim 7 , wherein the pre-charging apparatus is configured to receive the command via the communication unit.9. The apparatus of claim 1 , wherein the control unit to automatically close the electrical switch is configured to automatically close the switch after a second waiting time.10. The apparatus of claim 1 , wherein the control unit to automatically close the electrical switch is configured to close the switch after restoration of a voltage on the busbar above a threshold value.11. The apparatus of claim 3 , wherein the pre-charging apparatus is configured to receive a deactivation command via the communication unit upon the voltage on the busbar not rising claim 3 , indicating a fault which still ...

Determining the flow velocity in a coolant circuit

A conversion device converts an input power into an output power, and gives rise to a power loss. The conversion device is cooled by a coolant circuit in which a coolant flows. A monitoring device determines, using operating data of the conversion device and/or of the coolant circuit, a flow velocity of the coolant and compares the flow velocity with a limit velocity. If the flow velocity reaches or exceeds the limit velocity, the monitoring device resorts to a special reaction. As long as the flow velocity does not reach the limit velocity, the monitoring device resorts either to no reaction or to a normal reaction that is not the same as the special reaction. The monitoring device determines the flow velocity by using a quantity of heat that is to be removed by the coolant per unit time, a local temperature of the conversion device, and an inflow temperature.

Current mode control type switching power supply device

A switching power supply device includes a first switch, a second switch, a current sensing portion configured to sense current flowing in the second switch, and a controller configured to control the first and second switches in accordance with the current sensed by the current sensing portion. The controller includes an accumulating portion configured to accumulate information of the current sensed by the current sensing portion during a predetermined period of time while the first switch is in the off state, and reflecting portion configured to start the transmission of the current information accumulated by the accumulating portion before the first switch is changed from the off state to the on state so as to reflect the current information accumulated by the accumulating portion on the slope voltage, and controls the first and second switches in accordance with the slope voltage. 1. A current mode control type switching power supply device comprising:a first switch having a first terminal connected to an application terminal to which an input voltage is applied;a second switch having a first terminal connected to a second terminal of the first switch and a second terminal connected to an application terminal to which a voltage lower than the input voltage is applied;a current sensing portion configured to sense current flowing in the second switch; anda controller configured to control the first switch and the second switch in accordance with the current sensed by the current sensing portion,whereinthe controller includes an error amplifier configured to amplify a difference between a voltage corresponding to an output voltage of the current mode control type switching power supply device and a reference voltage, andthe controller controls off timing of the first switch by comparing a slope voltage based on the current flowing in the second switch and an output voltage of the error amplifier.2. The current mode control type switching power supply device ...

Electric Power Conversion Device

An electric power conversion device includes: a switching element; a collector side wiring connected to a collector side of the switching element; an emitter side wiring connected to an emitter side of the switching element; a detection circuitry configured to detect an induction voltage generated in the collector side wiring or the emitter side wiring when a current flows through the collector side wiring or the emitter side wiring; and a comparison circuitry configured to compare the induction voltage detected by the detection circuitry and a predetermined threshold voltage determined in advance to each other.

DRIVING CIRCUIT FOR HIGH-SIDE TRANSISTOR

A driving circuit drives an N-channel or NPN high-side transistor. A level shift circuit includes an open-drain differential conversion circuit that converts an input signal Sinto a differential signal S/S, and a latch circuit that switches its state according to the differential output S/Sof the differential conversion circuit. A driver drives a high-side transistor according to an output of the level shift circuit. A bootstrap circuit generates a bootstrap voltage Vto be used as an upper-side power supply for the driver. Upon detecting an abnormal state, a protection circuit controls at least a part of the driving circuit except for the input signal Sso as to turn off the high-side transistor. 1. A driving circuit for an N-channel or otherwise NPN high-side transistor , the driving circuit comprising:a level shift circuit comprising an open-drain differential conversion circuit structured to convert an input signal into a differential signal, and a latch circuit structured to transit according to a differential output of the differential conversion circuit;a driver structured to drive the high-side transistor according to an output of the level shift circuit;a bootstrap circuit structured to generate a bootstrap voltage to be used as an upper-side power supply for the driver; anda protection circuit structured to cause turn off of the high-side transistor in an abnormal state.2. The driving circuit according to claim 1 , wherein the protection circuit is structured to control a differential input of the latch circuit so as to switch the latch circuit to a state that corresponds to an off state of the high-side transistor in the abnormal state.3. The driving circuit according to claim 2 , wherein the protection circuit comprises a first transistor arranged between one terminal of the differential input of the latch circuit and a ground claim 2 ,and the protection circuit is structured to turn on the first transistor in the abnormal state.4. The driving circuit ...

METHODS AND APPARATUS TO CLAMP OVERVOLTAGES FOR ALTERNATING CURRENT SYSTEMS

Methods and apparatus to clamp overvoltages for inductive power transfer systems are described herein. An example overvoltage protection circuit is described, including a first terminal configured to receive an alternating current signal for conversion to a second signal, a capacitor, a first switch configured to selectively electrically couple the capacitor to the first terminal based on an overvoltage detection signal to reduce an overvoltage on the second signal, and an overvoltage detector. The example overvoltage detector is configured to determine a signal level of the second signal and, in response to determining that the signal level of the second signal is greater than a threshold, to output the overvoltage detection signal to cause the switch to electrically couple the capacitor between the first terminal and a second terminal. 1. An overvoltage protection circuit , comprising:a first terminal configured to receive an alternating current signal for conversion to a second signal;a second terminal to receive the second signal based on the alternating current signal;a capacitor in circuit with the first terminal;a switch in circuit with the capacitor and the first terminal configured to selectively electrically couple the capacitor to the first terminal based on an overvoltage detection signal to reduce an overvoltage on the second signal; andan overvoltage detector in circuit with the second terminal and the switch and configured to determine a signal level of the second signal and, in response to determining that the signal level of the second signal is greater than a threshold, to output the overvoltage detection signal to cause the switch to electrically couple the capacitor between the first terminal and a second terminal.2. An overvoltage protection circuit as defined in claim 1 , wherein the overvoltage detector comprises a comparator configured to compare the second signal to the threshold and to generate the overvoltage detection signal when the ...

Constant switching frequency discontinuous current mode average output current control scheme

The constant switching frequency discontinuous current mode average output current control scheme is composed of a reference block, reference calculation block, state detecting block, error detector block, zero state detector, power driver block and internal clock. The reference block generates preset reference; The reference calculation block, based on the power current converter's power topology, the correspondent algorithm is calculated to convert the input reference from the reference block into correspondent output; It is the output of reference calculation block that makes state detecting block, error detector block, zero state detector, power driver block and internal clock operate together and control the power current converter's output following with the output of reference block 1. A constant switching frequency discontinuous current mode average output current control scheme is composed of a reference block , a reference calculation block , a state detecting block , an error detector block , a zero state detector , a power driver block and an internal clock;The reference block generates preset reference;The reference calculation block, based on the power current converter's power topology, the correspondent algorithm is calculated to convert the input reference from the reference block into correspondent output;The state detecting block is designed to detect states of power current converter and the detected signals are converted into the same signal format as one of output from the reference calculation block;The error detector is used to detect the error between the outputs from the reference calculation block and the state detected block and to trigger the power driver block to turn off the power switch in the power current converter as the error is cross over zero;The zero state detector is used to detect when the states of the power current converter is cross over zero to feedback the signal into the reference calculation block;The internal clock ...

Micro-loss combined mechanical dc circuit breaker and its control method

The present disclosure relates to a micro-loss combined mechanical DC circuit breaker and its control method, consisting n ports, n load current paths and a main breaker; wherein the n load current paths are parallel with the main breaker, and each load current path is divided into an upper bridge arm and a lower bridge arm at a connection point; each port is electrically connected to the connection point of a load current path; the upper bridge arm of each load current path is made of an ultra-fast mechanical switch; the lower bridge arm of each load current path is made of a residual current breaker and a fast closing switch; the main breaker consists of a high-voltage capacitor in series with a low-voltage capacitor that is pre-charged.

LOAD DRIVING DEVICE

A load driving device, wherein a logic portion for switching on/off a switch element connected to a load includes: a switch signal generation circuit for generating a switch signal so that the switch element is left on by default in a time duration from when power is turned on until an external reset release is performed by a microcomputer; an overcurrent protection circuit for performing, after the external reset release, an output restriction of the switch signal so as to forcibly switch the switch element off in response to an overcurrent detection signal; and a latch circuit for performing, in the time duration from when power is turned on until the external reset release is performed by the microcomputer, an output restriction of the switch signal so as to forcibly switch the switch element off with the overcurrent detection signal serving as a latch trigger. 1. A load driving device , comprising:a driver portion including a switch element connected to a load;a logic portion configured to turn on/off the switch element; andan overcurrent detection portion configured to monitor a current flowing through the switch element and generate an overcurrent detection signal,wherein a switch signal generation circuit configured to generate a switch signal so as to maintain the switch element in an on state by default from when power is turned on until an external reset is released by a microcomputer,', 'an overcurrent protection circuit configured to perform output restriction of the switch signal so as to forcibly turn off the switch element in response to the overcurrent detection signal after the external reset is released, and', 'a latch circuit configured to perform output restriction of the switch signal so as to forcibly turn off the switch element with the overcurrent detection signal serving as a latch trigger from when the power is turned on until the external reset is released by the microcomputer., 'the logic portion includes'}2. The load driving device ...

DRIVER FOR POWER DEVICE

A driver for a power device. The driver includes: a voltage providing module, configured to provide a voltage required for the power device; a drive signal isolation module, including a signal input end and a signal output end isolated with each other, the signal input end being configured to receive an external drive signal, and the signal output end being connected to a control end of the power device and configured to provide an isolation drive signal for the power device; a short circuit/overcurrent protection module, connected to a drain electrode of the power device, and configured to cut off the power device when a short circuit or an overcurrent occurs for the power device. The driver also includes a Miller clamp module, an under-voltage protection module and an over-temperature protection module. 16- (canceled)7. A driver for a power device , comprising:a voltage providing module, configured to provide a voltage required for the power device;a drive signal isolation module, comprising a signal input end and a signal output end isolated with each other, the signal input end being configured to receive an external drive signal, and the signal output end being connected to a control end of the power device and configured to provide an isolation drive signal for the power device;a short circuit/overcurrent protection module, connected to a drain electrode of the power device, and configured to cut off the power device when at least one of a short circuit and an overcurrent occurs for the power device;a Miller clamp module, connected to a drive end of the power device, and configured to remove Miller effect;an under-voltage protection module, connected to a node between the drive signal isolation module and the power device, and configured to cut off an input of the isolation drive signal to the power device when an input voltage is under voltage; andan over-temperature protection module, connected to the node between the drive signal isolation module and the ...

Flyback power converter having overly high voltage protection and primary side controller circuit thereof

A flyback power converter includes: a transformer, a primary side switch and a primary side controller circuit. The primary side controller circuit includes: a pulse modulation circuit and a protection control circuit. The pulse modulation circuit generates a pulse modulation signal. The protection control circuit is coupled to the pulse modulation circuit and compares an AC voltage related signal with an over voltage threshold. When the AC voltage related signal exceeds the over voltage threshold, the comparison circuit generates an over voltage protection trigger signal. When the pulse number of the over voltage protection trigger signal exceeds the over voltage counting threshold, the over voltage counter circuit triggers an over voltage protection signal, to indicate that an over voltage condition occurs, and a protection operation is performed.

Extended Fault Indication and Reporting in Voltage Regulator Systems

A voltage regulator controller includes a first pin for receiving aggregate temperature information from a plurality of power stages, a plurality of second pins each for receiving phase current information from one of the power stages, control circuitry for controlling the power stages, detection circuitry for detecting signal levels at the first and second pins, and fault analysis circuitry for identifying the type of reported fault and the power stage that reported the fault based on the detected signal levels at the first and second pins and state information accessible by the controller. Aggregate temperature information is reported at the first pin in a first nominal range, and phase current information is reported at each of the second pins in a second nominal range. Each reported fault type has a unique fault signature at the first and second pins, which is outside at least one of the nominal ranges.

METHODS, APPARATUS, AND SYSTEMS TO FACILITATE A FAULT TRIGGERED DIODE EMULATION MODE OF A TRANSISTOR

Methods, systems, and apparatus to facilitate a fault triggered diode emulation mode of a transistor. An example apparatus includes a driver to output a control signal to a gate terminal of a transistor of a power converter; and a diode emulation control circuit to, in response to determining a fault corresponding to the transistor, enable the transistor when current flows in a direction from a source terminal of the transistor to a drain terminal of the transistor. 1. A circuit comprising:a comparator having a first comparator input, a second comparator input, a power input, and a comparator output;a switch having a first switch terminal, a second switch terminal, and a control terminal, the first switch terminal coupled to the power input and the second switch terminal coupled to a voltage supply terminal; anda state machine coupled to the control terminal.2. The circuit of claim 1 , further comprising a differential amplifier having a first amplifier input claim 1 , a second amplifier input claim 1 , and an amplifier output claim 1 , the amplifier output coupled to the first comparator input.3. The circuit of claim 2 , wherein the first amplifier input is coupled to a first current terminal of a transistor and the second amplifier input is coupled to a second current terminal of the transistor.4. The circuit of claim 1 , wherein the first comparator input is coupled to a current sensor for a transistor.5. The circuit of claim 1 , further comprising a driver coupled to the state machine.6. The circuit of claim 1 , wherein the state machine is configured to in response to detecting a fault claim 1 , send an enable signal to the control terminal.7. The circuit of claim 1 , wherein the state machine is configured to instruct the switch to close in response to detecting a fault.8. A circuit comprising:a transistor having a first current terminal, a second current terminal, and a control terminal;a diode emulation circuit coupled to the control terminal;a driver ...

SYSTEM AND METHOD FOR COMPACT MOTOR CONTROL WITH REDUNDANT POWER STRUCTURES

A compact motor control system for selectively controlling power from a power source to a load includes a motor switching assembly having a solid state contactor with a plurality of solid state switches. The motor switching assembly also includes at least one direct current (DC) link coupled to the solid state contactor and redundant first and second inverters coupled to the at least one DC link. The motor switching assembly further includes a first relay coupled between the solid state contactor and an input of the inverter and a second relay coupled between the solid state contactor and an input of the second inverter. In addition, the motor control system includes a control system programmed to control the motor switching assembly to selectively supply power to the load from the power source. 1. An apparatus comprising: 'a first power converter on a first path; a second power converter on a second path that is parallel to the first path; and a solid state contactor connected to the first path and the second path; and', 'a motor switching assembly comprisinga control system coupled to the motor switching assembly, wherein the control system is configured to provide control signals to the motor switching assembly to thereby prevent or allow current flow in the first path and the second path.2. The apparatus of claim 1 , wherein an input of the solid state contactor is connected to an AC power source.3. The apparatus of claim 2 , wherein the control system is powered by the AC power source.4. The apparatus of claim 1 , wherein the motor switching assembly further comprises a bypass path in parallel with the first path and the second path.5. The apparatus of claim 4 , wherein the bypath path comprises a bypass relay assembly.6. The apparatus of claim 1 , wherein the motor switching assembly further comprises a first relay assembly on the first path; and a second relay assembly on the second path claim 1 , andthe control system is configured to provide the control ...

SHORT CIRCUIT PROTECTION FOR DATA INTERFACE CHARGING

A switching power converter is provided with an overvoltage protection circuit that softly switches on a power bus switch during a soft-start period responsive to a device connecting to a data cable for receiving power over a power bus coupled to the power bus switch. 1. A method , comprising:detecting that a device has connected to data cable including a power bus for receiving power from the power bus;in a power converter, charging an output capacitor to a power supply voltage, the output capacitor being coupled to the power bus through a power bus switch that is off prior to the expiration of a de-bouncing period following the connection of the device to the data cable;softly switching on the power bus switch at a beginning of a soft-start period following the expiration of the de-bouncing period, wherein the power bus switch has a greater resistance while being softly-switched on than when full-switched on; andswitching the power bus switch off during the soft-start period responsive to a determination that the power supply voltage has dropped below a short circuit threshold voltage.2. The method of claim 1 , wherein softly switching on the power bus switch comprises switching on a soft-switch transistor to couple a gate of a power bus switch transistor through a soft-start resistor to a node charged to the power supply voltage.3. The method of claim 2 , further comprising:comparing the power supply voltage to a rise threshold voltage during the soft-start period; andfully switching on the power bus switch transistor responsive to the comparison indicating that the power supply voltage is greater than the rise voltage threshold.4. The method of claim 3 , wherein the data cable is a USB cable.5. The method of claim 4 , wherein the USB cable is a USB type C cable.6. The method of claim 1 , wherein charging the output capacitor to the power supply voltage comprises charging the output capacitor through a second stage of a flyback converter.7. The method of claim 1 ...

Method, electrical circuit arrangements and insulation monitoring devices for an interference-resistant insulation monitoring of an ungrounded power supply system having a converter

The invention relates to a method, electrical circuit arrangements and insulation monitoring devices for an interference-resistant insulation monitoring of an ungrounded power supply system having a converter. 1. A method for an interference-resistant insulation monitoring of an ungrounded power supply system having a converter , comprising the method steps:applying a measuring voltage between an active conductor of the power supply system and ground and detecting a measuring signal driven by the measuring voltage,detecting a displacement voltage between an active conductor of the power supply system and ground on an input side of the converter,filtering a switching-frequent signal portion, which is generated by the converter, from the detected displacement voltage,evaluating the filtered, switching-frequent signal portion,triggering a switching signal should the evaluation of the switch-ing-frequent signal portion yield that the switching-frequent signal portion surmount a critical amplitude value.2. The method according to claim 1 ,characterized byseparating the converter from the power supply system should the switching signal be triggered.3. A method for an interference-resistant insulation monitoring of an ungrounded power supply system having a converter claim 1 , comprising the method steps:applying a measuring voltage between an active conductor of the power supply system and ground and detecting a measuring signal driven by the measuring voltage,replicating a pulse width modulation signal of the converter, assessing the replicated pulse width modulation signal using filter characteristics corresponding to a filtering of the detected measuring signal in order to obtain a low-frequency interfering signal, subtracting the low-frequency interfering signal from the detected measuring signal.4. The method according to claim 3 ,characterized in thata frequency and a duty factor of the pulse width modulation signal are provided by the converter via a digital ...

Over Voltage Protection System and Method

A dynamic over voltage protection OVP system for limiting an output voltage at an output of a voltage regulation system is described. The dynamic OVP system contains an enabling device and an output voltage limiting device which are communicatively coupled to each other. The enabling device detects a load release at the output of the external voltage regulation system and generates an enable signal based on the detection. The output voltage limiting device receives the enable signal and limits the output voltage based on the enable signal. In this way, the voltage fluctuation at the output of the voltage regulation system is reduced when a subsequent load step occurs e.g. when a load is re-connected to the output of the voltage regulation system. 1) A dynamic over voltage protection OVP system for limiting an output voltage at an output of an external voltage regulation system , the dynamic OVP system comprisingan enabling device configured to detect a load release at the output of the external voltage regulation system and to generate an enable signal based on the detection; andan output voltage limiting device configured to receive the enable signal and to limit the output voltage based on the enable signal.2) The dynamic OVP system of claim 1 , wherein the enabling device is configured to detect the load release at the output of the external voltage regulation system when a current at the output of the external voltage regulation system is below a current threshold.3) The dynamic OVP system of claim 1 , wherein the enabling device is configured to detect the load release at the output of the external voltage regulation system when a current at the output of the external voltage regulation system is zero or close to zero.4) The dynamic OVP system of claim 1 , wherein the enabling device is configured to detect the load release at the output of the external voltage regulation system if no load is connected to the output of the external voltage regulation system.5) ...

Power supply apparatus and image forming apparatus

The switching power supply apparatus including a transformer includes a detection unit configured to detect that the power supply apparatus malfunctions and a first holding unit configured to turn off a first switching element and holds the first switching element at turn-off condition, and when the detection unit detects that malfunction occurs, the first holding unit releases the first switching element from the turn-off condition at a timing when the control unit turns on the second switching element by a second control signal.

Ground fault minimization

A circuit for minimizing energy provided to a ground fault includes a source, a multiple switches, an output filter, and a controller. The switches include a first side pair of switches and a second side pair of switches configured to provide an output signal based on the source. The output filter includes one or more energy storage elements coupled to the first side pair of switches or the second side pair of switches. The controller is configured to receive a ground fault signal that indicates a fault has occurred and configured to generate a switch signal for the switches for a minimum energy state of the output filter and in response to the ground fault signal.

Inverter apparatus with overcurrent protection control

An inverter apparatus with overcurrent protection control includes a first terminal of a DC input terminal connected to an AC output terminal through a first switch element and a second switch element, and a second terminal of the DC input terminal connected to the AC output terminal through a fourth switch element and a third switch element. An intermediate potential terminal is connected to a fifth switch element and a sixth switch element, and connected to the AC output terminal through the fifth switch element and the second switch element, and connected to the AC output terminal through the sixth switch element and the third switch element. When the control unit determines that the inverter apparatus is in an overcurrent state, the control unit controls a sequence of turning off the inverter apparatus to be the second switch element, the first switch element, and the sixth switch element.

POWER SUPPLY WITH CURRENT LIMIT ON INDIVIDUAL CONDUCTORS

Circuits, methods, and apparatus that may provide power supply voltages in a safe and reliable manner that meets safety and regulatory concerns and does not exceed physical limitations of cables and other circuits and components used to provide the power supply voltages. One example may provide a cable having a sufficient number of conductors to provide power without exceeding a maximum current density for the conductors. Another example may provide a cable having more than the sufficient number of conductors in order to provide an amount of redundancy. Current sense circuits may be included for one or more conductors. When an excess current is sensed, a power source in the power supply may be shut down, the power source may be disconnected from one or more conductors, or both events may occur. 125-. (canceled)26. A power supply comprising:a power source to provide a power supply voltage;a connector coupled to receive the power supply voltage from the power source;fault detection circuitry to determine a presence a fault in a cable connected to the connector, and when the fault detection circuitry detects a fault in the cable, the power supply voltage provided to the cable is reduced; andconnection detection circuitry to detect a connection between the cable and an electronic device, and when the connection detection circuitry detects a disconnect between the cable and the electronic device, the power supply voltage provided to the cable is reduced.27. The power supply of wherein when the fault detection circuitry detects a fault in the cable claim 26 , the power source is disconnected from the connector.28. The power supply of wherein the fault is a short in a conductor in the cable.29. The power supply of wherein the fault is an excessive current in a conductor in the cable.30. The power supply of wherein the fault detection circuitry consists of fixed-function circuitry.31. The power supply of wherein the connection detection circuitry determines the presence of ...

SHORT CIRCUIT DETECTION AND PROTECTION FOR A GATE DRIVER CIRCUIT AND METHODS OF DETECTING THE SAME USING LOGIC ANALYSIS

A gate driver circuit is provided that includes a high-side power transistor; a low-side power transistor coupled to the high-side power transistor, where an output voltage is generated at a load node coupled between the low-side power transistor and the high-side power transistor; a gate driver configured to receive a high-side control signal and a low-side control signal, drive the high-side power transistor based on the high-side control signal, and drive the low-side power transistor based on the low-side control signal; and a short circuit detection circuit configured to monitor for short circuit events at the high-side power transistor and at the low-side power transistor based on the high-side control signal, the low-side control signal, and the output voltage, and, generate a fault signal in response to detecting a short circuit event at either of the high-side power transistor or the low-side power transistor. 1. A gate driver circuit , comprising:a high-side power transistor;a low-side power transistor coupled to the high-side power transistor, wherein an output voltage is generated at a load node coupled between the low-side power transistor and the high-side power transistor;a gate driver configured to receive a high-side control signal and a low-side control signal, drive the high-side power transistor based on the high-side control signal, and drive the low-side power transistor based on the low-side control signal; anda short circuit detection circuit configured to monitor for short circuit events at the high-side power transistor and at the low-side power transistor based on the high-side control signal, the low-side control signal, and the output voltage, and, generate a fault signal in response to detecting a short circuit event at either of the high-side power transistor or the low-side power transistor.2. The gate driver circuit of claim 1 , wherein:the short circuit detection circuit is configured to compare an output voltage measurement ...

A POWER CONVERTER AND MANAGEMENT SYSTEM FOR PROVIDING ENERGY TO A PULSATING LOAD

An energy storage (ES) circuit including a plurality of terminals configured to connect to a pulse load having an input voltage and drawing a low current during a first interval and a high current during a second interval, and connect to a power supply having a source voltage and delivering a source current, an energy storage capacitor connected to the plurality of terminals, and a bidirectional direct current (DC) to DC converter configured to recharge, during at least a portion of the first interval, the energy storage capacitor using a plurality of charge drawn from the source current, and reduce a drop in the input voltage during the second interval by delivering a difference between the source current and the high current to the pulse load using the plurality of charge stored in the energy storage capacitor. 14-. (canceled)5. A power converter and management system for providing energy to a pulsating load , comprising:an up-converter for converting a primary battery power source voltage to a higher voltage on a storage capacitor thereby storing energy in the storage capacitor for providing energy to a single pulse load of the pulsating load;a limiter for limiting a current drawn by the up-converter, from the primary power source voltage, to a maximum current setting;a down-converter for converting the storage capacitor voltage to a lower operating voltage, wherein the lower operating voltage is provided to the single pulse load of the pulsating load thereby consuming energy stored in the storage capacitor and thereby leaving a residual storage voltage at the storage capacitor; and (i) a voltage measurer configured to measure the residual storage voltage at the storage capacitor after energy in the storage capacitor has been consumed by the single pulse load of the pulsating load;', '(ii) a comparer configured to compare the measured residual storage voltage against a predetermined target voltage thereby defining a delta voltage; and', '(iii) a controller ...

Control apparatus for electric motor and control method for electric motor

A control apparatus for an electric motor has a drive circuit that drives the electric motor in which a plurality of phase coils are star-connected, a neutral point drive circuit connected to a neutral point of the star connection, semiconductor relays that cut off an electric path connecting the neutral point and the neutral point drive circuit, and a microcomputer. Furthermore, the microcomputer cuts off the electric path by the semiconductor relays when it is possible to normally drive the electric motor by the drive circuit.

METHOD FOR OPERATING AN ACTIVE CONVERTER CONNECTED TO AN ELECTRIC MACHINE AND MEANS FOR THE IMPLEMENTATION THEREOF

An active converter connected to an electric machine, including arresting circuits to activate a voltage arresting function from a first point-in-time, and which is configured to only activate a load dump reaction upon activation conditions from a second point-in-time, the activation conditions include that it is determined that at the second point-in-time, a supply-side voltage potential applied to an exciter winding of the electric machine is between the voltage potential applied at the first DC voltage terminal and a ground potential, if the exciter winding is disconnected from the voltage potential of the vehicle electrical system voltage and/or a current flowing through the exciter winding is below a current threshold value and/or after an initial activation of a load dump reaction, after which further load dump reactions were activated, more than a predefined period of time has elapsed and/or more than a predefined number of load dump reactions were activated. 110-. (canceled)11. A method for operating an active converter connected to an electric machine , the method , comprising:connecting a number of phase terminals via an activatable current control valve in a first converter branch to a first DC voltage terminal and via an activatable current control valve in a second converter branch to a second DC voltage terminal, each of the current control valves of one of the two converter branches having an arresting circuit; andactivating, via the arresting circuit, a voltage arresting function from a first point in time, from which a voltage potential applied at the first DC voltage terminal increases up to a predefined first threshold value, and keeping the voltage arresting function active as long as the voltage potential does not drop below the first threshold value, the voltage arresting function including activating the current control valves having the arresting circuit and thereby establishing a conductive connection between the phase terminal connected to ...

Power supply device, power supply control method, and storage device

According to one embodiment, a power supply device includes a power supply circuit including circuit blocks and configured to generate power supply voltages based on an external power supply, detectors that detect failures of the circuit blocks, a nonvolatile memory, and a controller that stops an operation of the power supply circuit when any of the detectors detects the failure of any of the circuit blocks, and writes failure information of the power supply circuit into the nonvolatile memory. The failure information includes information indicating a type of the failure which has occurred and a circuit block among the circuit blocks in which the failure has occurred.

Wind turbine fault detection circuit and method

A wind turbine fault detection circuit and method is disclosed herein. In a described embodiment, the wind turbine fault detection circuit comprises a magnetometer in the form of a hall-effect sensor coupled between a power converter and a ground element of the power converter and configured to measure a ground current from the power converter to obtain a real ground current Ig; and a comparator configured to determine presence of a fault based on the real ground current.

POWER SUPPLY APPARATUS

A power supply apparatus is provided, in which a control chip is used to detect an AC input power, so that it is unnecessary to additionally set an external independent detection circuit, by which not only a design cost is decreased, an extra standby loss is also avoided. Moreover, the method of using the control chip to execute detection of the AC input power can effectively decrease detection deviation, so as to notify the load system within an allowable (accurate) time (i.e. the predetermined time). Moreover, the control chip can determine and adjust the predetermined time within which the indication signal is generated to notify the load system according to an application requirement of the load system, so that the power supply apparatus can be generally applied in different types of the load systems having a timing control requirement. 1. A power supply apparatus , comprising:a conversion circuit, configured to convert an AC input power to provide a DC output power to a load system;a control chip, coupled to the conversion circuit, configured to control an operation of the conversion circuit, and having a function of detecting the AC input power,wherein when the control chip detects that the AC input power is abnormal, the control chip generates an indication signal within a predetermined time to notify the load system.2. The power supply apparatus as claimed in claim 1 , wherein the control chip comprises:a control body, configured to control the operation of the conversion circuit, and detect the AC input power; andan indication unit, coupled to the control body, and determining whether to generate the indication signal within the predetermined time in response to detection of the AC input power performed by the control body.3. The power supply apparatus as claimed in claim 2 , wherein the control body detects the AC input power through a high-voltage pin claim 2 , a brown-in & brown-out pin claim 2 , a discharge function pin claim 2 , an input voltage (Vac) ...

Non-transformer isolated dc-dc power supply including shut down circuit

A direct current-to-direct current (DC-DC) power supply includes a voltage converter module that converts an input voltage having a first voltage level into an output voltage having a second voltage level that is less than the first voltage level. An over-voltage detection module receives the second voltage and generates an over-voltage signal indicating an over-voltage condition of the DC-DC power supply. A shutdown module receives the over-voltage signal and generates a shutdown signal in response to the over-voltage condition. An over-voltage protection module interposed between the shutdown module and the input of the voltage converter module. The over-voltage protection module is configured to selectively inhibit delivery of the input voltage to the voltage converter module in response to the shutdown signal.

Safety shutdown apparatus with self-driven control, power supply system, and method of controlling the same

A safety shutdown apparatus with self-driven control is coupled to a power-supplying path between a power supply apparatus and a load. The safety shutdown apparatus includes a detection unit, a controllable switch, and a drive circuit. The detection unit is coupled to the power-supplying path, and the controllable switch is coupled between a positive node and a negative node of the power-supplying path. The drive circuit is coupled to the detection unit, the power-supplying path, and the controllable switch. The drive circuit receives an output voltage of the power supply apparatus to turn on the controllable switch, and turn off the controllable switch according to whether the detection unit detects a current flowing through the power-supplying path.

LOW PHASE SURGE PROTECTION DEVICE

The invention provides a low phase surge protection device including a voltage converter, a low phase delay detector and an output control switch. The voltage converter receives an alternate current (AC) input voltage, and converts the AC input voltage into a direct current (DC) input voltage. The low phase delay detector receives the DC input voltage to be a power source, enables a phase detection scheme by detecting whether the AC input voltage is in a stable state, and generates an enable signal by detecting a phase of the AC input voltage after the phase detection scheme is enabled. The output control switch receives the AC input voltage, and determines whether to transmit the AC input voltage to be an output voltage according to the enable signal. 1. A low phase surge protection device , comprising:a voltage converter, receiving an alternate current (AC) input voltage, and converting the AC input voltage to generate a direct current (DC) input voltage;a low phase delay detector, coupled to the voltage converter, receiving the DC input voltage to be a power voltage, enabling a phase detection scheme by detecting whether the AC input voltage is in a stable state, and generating an enable signal by detecting a phase of the AC input voltage after the phase detection scheme is enabled; andan output control switch, coupled to the low phase delay detector, receiving the AC input voltage, and determining whether to transmit the AC input voltage to be an output voltage according to the enable signal.2. The low phase surge protection device according to claim 1 , wherein the phase detector comprises:a stable voltage detector, receiving the AC input voltage, and determining whether to enable the phase detection scheme according to a comparison of a voltage peak of the AC input voltage with a first reference voltage; anda phase detector, coupled to the stable voltage detector, wherein the phase detector generates the enable signal according to a comparison of a voltage ...

SWITCHING CIRCUIT

A switching circuit includes: a detection wiring configured to receive a potential changing depending on a current of a first switching element; a first circuit connected between the detection wiring and a first having a first time constant, and making the first wiring follow the potential of the detection wiring; a second circuit connected between the detection wiring and a second wiring, having a second time constant larger than the first time constant, and making the second wiring fellow the potential of the detection wiring; a potential maintaining circuit configured to maintain the second wiring at a potential higher than the potential of the first wiring while a current is not flow through the first switching element; and a control circuit configured to turn off the first switching element in a case where the potential of the first wiring exceeds the potential of the second wiring. 1. A switching circuit configured to switch a first switching element , the switching circuit comprising:the first switching element;a current detection wiring configured to receive a potential which changes depending on a current flowing through the first switching element;a first circuit connected between the current detection wiring and a first wiring, having a first time constant, and configured to make a potential of the first wiring follow the potential of the current detection wiring;a second circuit connected between the current detection wiring and a second wiring, having a second time constant larger than the first time constant, and configured to make a potential of the second wiring follow the potential of the current detection wiring;a potential maintaining circuit configured to maintain. the potential of the second wiring at a potential higher than the potential of the first wiring while the current is not flowing through the first switching element; anda control circuit configured to turn off the first switching element in a case where the potential of the first ...

VOLTAGE HARVESTER FOR POWER DISTRIBUTION SYSTEM DEVICES

The present disclosure provides exemplary embodiments of voltage harvesting devices used in power distribution systems, and provides power distribution system architectures utilizing the voltage harvesting devices. Generally, the voltage harvesting devices transform distribution line AC voltages to produce a low wattage output for distribution system communication and control type devices. The voltage harvesting device can operate whether irrespective of the presence of load current. 1. A voltage harvesting device for use in power distribution systems , the voltage harvesting device comprising:a housing; and a positive input capable of being electrically coupled to a loaded or unloaded source line voltage;', 'a negative input electrically coupled to the at least one second impedance component; and', 'an output capable of being coupled to a device, wherein the output and the device both reference a floating ground of the loaded or unloaded source line voltage;, 'a transformation circuit within the housing, the transformation circuit including at least one first impedance component and at least one second impedance component, the at least one first impedance component havingwherein the first impedance component and the second impedance component are arranged as a voltage divider, the voltage divider producing an AC voltage on the output of the first impedance component that is a higher voltage than the loaded or unloaded source line voltage.2. The voltage harvesting device according to claim 1 , wherein the second impedance component is coupled to actual ground.3. The voltage harvesting device according to claim 2 , further comprising a first overvoltage disconnect component electrically coupled between the positive input of the at least one first impedance component and actual ground.4. The voltage harvesting device according to claim 3 , wherein the first overvoltage device comprises one or more daisy-chained bi-directional TVS diodes claim 3 , FETs claim 3 , or PTC ...

Power conversion apparatus and control method of the same

A power conversion apparatus includes: a converter including switching elements and configured to convert an AC voltage supplied from an AC power supply through a switch unit into a DC voltage; a filter provided between the switch unit and the converter and including reactors and capacitors, the filter being configured to remove noise; and a control unit configured to discharge electric charge stored in the capacitors by setting the switching elements into an ON state after opening the switch unit.

Inverter device and power steering device

An inverter device includes a switch circuit configured by series-connecting two N-channel semiconductor switching elements in opposite directions so that the switch circuit makes or breaks electrical connection between a DC power supply and an inverter circuit and a control circuit carrying out a protecting operation in which when the control circuit output a control signal to control switching of the inverter circuit and an operating condition is met, the control circuit stops output of the control signal to turn off all switching elements configuring the inverter circuit and the switch circuit. In the protecting operation, the switch circuit is turned off after output of the control signal has been stopped.

BATTERY-SUPPORTED BRAKING SYSTEM FOR A WIND TURBINE

The present disclosure is directed to a protection system for a wind turbine power system connected to a power grid. The protection system includes a main brake circuit having at least one brake resistive element and at least one brake switch element, a battery system, and a controller. The brake resistive element is coupled to at least one of a DC link of a power converter of the wind turbine power system, windings of a rotor of the generator, or windings of a stator of a generator of the wind turbine power system via the brake switch element. The battery system is coupled to the generator via a battery switch element. In addition, the controller is configured to disconnect the power converter and the generator from the power grid and connect at least one of the main brake circuit or the battery system to the generator in response to detecting an electromagnetic (EM) torque loss event so as to generate an EM torque. 1. A protection system for a wind turbine power system connected to a power grid , the wind turbine power system having a generator with a stator and a rotor and a power converter having a rotor-side converter , a grid-side converter , and a DC link configured therebetween , the protection system comprising:a main brake circuit having at least one brake resistive element and at least one brake switch element, the brake resistive element coupled to at least one of the DC link of the power converter, windings of the rotor of the generator, or windings of the stator of the generator via the brake switch element;a battery system coupled to the generator via a battery switch element; and,a controller configured to disconnect the power converter and the generator from the power grid and connect at least one of the main brake circuit or the battery system to the generator in response to detecting an electromagnetic (EM) torque loss event so as to generate an EM torque.2. The protection system of claim 1 , further comprising a first switch element coupled ...

SYSTEMS AND METHODS FOR CONTROLLING A SEGMENTED CIRCUIT

The present disclosure provides a method for controlling a surgical instrument. The method includes connecting a power assembly to a control circuit, wherein the power assembly is configured to provide a source voltage, energizing, by the power assembly, a voltage boost convertor circuit configured to provide a set voltage greater than the source voltage, and energizing, by the voltage boost convertor, one or more voltage convertors configured to provide one or more operating voltages to one or more circuit components. 1. A method for controlling a surgical instrument , the method comprising:connecting a power assembly to a control circuit, wherein the power assembly is configured to provide a source voltage;energizing, by the power assembly, a voltage boost convertor circuit configured to provide a set voltage greater than the source voltage; andenergizing, by the voltage boost convertor, one or more voltage convertors configured to provide one or more operating voltages to one or more circuit components.2. The method of claim 1 , comprising energizing claim 1 , by the voltage boost convertor claim 1 , a first regulator configured to provide a first operating voltage to a first subset of the one or more circuit components.3. The method of claim 2 , comprising energizing claim 2 , by the first regulator convertor claim 2 , a second regulator configured to provide a second operating voltage to a second subset of the one or more circuit components.4. The method of claim 3 , wherein the voltage boost convertor claim 3 , the first regulator claim 3 , and the second regulator are coupled in a daisy chain configuration.5. The method of claim 4 , comprising providing claim 4 , by the power assembly claim 4 , a voltage of about 12 volts claim 4 , the set voltage comprises a voltage of about 13 volts claim 4 , the first operating voltage comprises a voltage of about 5 volts claim 4 , and the second operating voltage comprises a voltage of about 3.3 volts.6. The method of ...

DIAGNOSTIC SYSTEM FOR A VEHICLE ELECTRICAL SYSTEM HAVING A DC-DC VOLTAGE CONVERTER AND A VOLTAGE REGULATOR

A diagnostic system is provided. A first monitoring application sets a first voltage regulator status flag equal to a first fault value when a first voltage value is greater than a first maximum voltage value. A first diagnostic handler application transitions each of a high voltage switch and a low voltage switch to an open operational state when the first voltage regulator status flag is equal to the first fault value. A second monitoring application sets a second voltage regulator status flag equal to a second fault value when the second voltage value is less than a first minimum voltage value. A second diagnostic handler application transitions the high voltage switch and the low voltage switch to the open operational state when the second voltage regulator status flag is equal to the second fault value. 1. A diagnostic system for a vehicle electrical system having a DC-DC voltage converter and a voltage regulator , the DC-DC voltage converter having a DC-DC voltage converter control circuit coupled between a high voltage switch and a low voltage switch , the voltage regulator having first and second output terminals outputting first and second voltages , respectively , comprising:a microcontroller having a microprocessor and a first analog-to-digital converter, the microprocessor having first and second voltage regulator monitoring applications and first and second diagnostic handler applications;the first analog-to-digital converter measuring the first voltage of the voltage regulator at a first time and generating a first voltage value based on the first voltage;the first voltage regulator monitoring application setting a first voltage regulator status flag equal to a first fault value when the first voltage value is greater than a first maximum voltage value;the first diagnostic handler application transitioning each of the high voltage switch and the low voltage switch to an open operational state when the first voltage regulator status flag is equal to the ...

LOAD SWITCH AND METHOD OF SWITCHING SAME

A load switch includes a switch element and first and second control circuits. The switch element has an input terminal for receiving an input voltage, an output terminal for providing an output voltage, and a control terminal for receiving a switch signal, which turns the switch element on and off. The first control circuit is connected to the control terminal of the switch element and turns off the switch element in response to a first control signal. The second control circuit also is connected to the control terminal of the switch element and keeps the switch element turned off, after the first control circuit has turned off the switch element. 1. A load switch , comprising:a switch element comprising a transistor having a drain terminal for receiving an input voltage, a source terminal for providing an output voltage, and a gate terminal for receiving a switch signal, wherein the switch signal turns the switch element on and off;a first control circuit having an input terminal for receiving a first control signal and an output terminal coupled to the gate terminal of the switch element, wherein the first control circuit, in response to the first control signal being at a turn-off level, shorts the gate terminal of the switch element to the source terminal of the switch element to turn-off the switch element; anda second control circuit having an input terminal that receives a second control signal and an output terminal coupled to the gate terminal of the switch element, wherein the second control circuit, in response to the second control signal being at a keep-off level, provides the gate terminal of the switch element with the switch signal to keep the switch element off, after the first control circuit has provided the switch signal to turn off the switch element.2. The load switch of claim 1 , wherein the first control circuit comprises:a first transistor having a gate terminal, a source terminal coupled to the gate terminal of the switch element for ...

ELECTRONIC CIRCUIT COMPRISING A SWITCHING MEANS

The invention relates to an electronic circuit comprising a switching means, having a monitoring circuit to monitor the switching status of the switching means. According to the invention the switching means comprises at least one semiconductor switch as a switching element, which semiconductor switch is connected to a gate driver which is controlled by a control signal (C) to effect switching of the semiconductor switch, the gate driver being supplied by a gate driver power supply, whereby the monitoring circuit is arranged between the semiconductor gate and its collector and comprises a series connection of an opto-coupler, a current-limiting resistor and a protection diode, which series connection is connected in series with the gate driver power supply. 1. Electronic circuit comprising a switching means , having a monitoring circuit to monitor the switching status of the switching means , characterized in that the switching means comprises at least one semiconductor switch as a switching element , which semiconductor switch is connected to a gate driver which is controlled by a control signal (C) to effect switching of the semiconductor switch , the gate driver being supplied by a gate driver power supply , whereby the monitoring circuit is arranged between the semiconductor gate and its collector and comprises a series connection of an opto-coupler , a current-limiting resistor and a protection diode , which series connection is connected in series with the gate driver power supply.2. Electronic circuit according to claim 1 , wherein the current-limiting resistor is of a MELF-type.3. Electronic circuit according to claim 1 , wherein the semiconductor switch is a transistor.4. Electronic circuit according to claim 1 , wherein a parallel diode is connected anti-parallel to the semiconductor switch.5. Electronic circuit according to claim 1 , wherein a coupler diode is connected in parallel to the opto-coupler.6. Electronic circuit according to claim 1 , which is ...

OVERCURRENT DETECTION DEVICE, CONTROL DEVICE, AND OVERCURRENT DETECTION METHOD

In recent years, an improvement in detection accuracy of an overcurrent is desired. An overcurrent detection device is provided, which includes a gate current detection unit that detects whether a gate current flowing to a semiconductor element is equal to or above a reference gate current; a sense current detection unit that detects whether a sense current flowing through a sense-emitter terminal of the semiconductor element is equal to or above a reference sense current; and an adjustment unit that decreases a detected value of the sense current relatively to the reference sense current if the gate current is equal to or above the reference gate current. 1. An overcurrent detection device comprising:a gate current detection unit that detects whether a gate current flowing to a semiconductor element is equal to or above a reference gate current;a sense current detection unit that detects whether a state at which the sense current flowing through a sense-emitter terminal of the semiconductor element is equal to or above the reference sense current is more than a reference time; andan adjustment unit that decreases a detected value of the sense current relative to the reference sense current if the gate current is equal to or above the reference gate current.2. The overcurrent detection device according to claim 1 , whereinthe adjustment unit lengthens the reference time if the gate current is equal to or above the reference gate current.3. The overcurrent detection device according to claim 1 , whereinthe adjustment unit decreases the detected value of the sense current if the gate current is equal to or above the reference gate current.4. The overcurrent detection device according to claim 1 , whereinthe sense current detection unit includes:a sense current detection resistor that is electrically connected between the sense-emitter terminal and a reference potential; anda sense current detection comparator that compares a sense detection voltage caused by the sense ...

SWITCHING MODE POWER SUPPLY PROVIDING AN OVER CURRENT PROTECTION WITH ANTI-SURGE FUNCTION

A switching mode power supply preventing false triggering of an over current protection due to a surge pulse. The switching mode power supply has a switch and an inductor. An inductor current flows through the inductor. The switching mode power supply turns off the switch and meanwhile starts timing for a preset period of time when the inductor current is larger than a preset value. The switch is kept off during the preset period of time and is then turned on when the preset period of time expires. 1. A driving circuit in a switching mode power supply , wherein the switching mode power supply comprises an inductor and a switch , and wherein an inductor current flows through the inductor , the driving circuit comprising:an over current comparison circuit configured to receive an over current threshold signal and a first current detecting signal representative of the inductor current generated during a period when the switch is on, wherein the over current comparison circuit is configured to generate an over current comparison signal to control a turning-off moment of the switch based on comparing the first current detecting signal with the over current threshold signal;a watch-dog circuit configured to receive a watch-dog triggering signal indicating the turning-off moment of the switch, wherein the watch-dog circuit is configured to generate a watch-dog signal based on the watch-dog triggering signal to trigger a turning-on operation of the switch after a preset period of time expires, and wherein the preset period of time is timed beginning from the turning-off moment of the switch;an on moment control circuit configured to receive a second current detecting signal representative of the inductor current generated during a period when the switch is off and to receive an on threshold signal, wherein the on moment control circuit is configured to generate an on signal to control a turning-on moment of the switch based on comparing the second current detecting signal ...

System and Method for Exciting Low-Impedance Machines Using a Current Source Converter

An energy conversion system includes a low-impedance generator having at least one armature winding set. The armature winding set includes a plurality of single-phase coils. The system also includes a current source converter assembly electrically coupled to an armature of the generator. The current source converter assembly includes at least one current source converter that includes a current source rectifier coupled to a current source inverter via a DC link and at least one capacitor across the plurality of single-phase armature coils. The capacitor(s) of the current source converter(s) is configured to absorb high frequency components of current pulses generated by the current source converter so as to minimize current ripple in a current applied to the plurality of single-phase coils.

Power supply system

A power supply system includes: a semiconductor switch ( 1 ) that is turned on at the time of normal supply from a commercial AC power supply ( 5 ); a first current detector (CT 1 ) including a transformer ( 10 ) and configured to detect an AC input current (I 1 ); a second current detector (CT 2 ) including a Hall effect sensor ( 20 ) and configured to detect an AC output current (I 2 ); and a failure detector ( 30 ) that determines that one of a pair of thyristors ( 1 a, 1 b ) included in the semiconductor switch ( 1 ) has misfired when the detection values from the first and second current detectors (CT 1 , CT 2 ) are not equal at the time of normal supply from the commercial AC power supply ( 5 ).

OVERVOLTAGE PROTECTION SYSTEMS AND METHOD

A power supply system and method are disclosed. The system includes a power supply to generate an output voltage in response to a pulse-width modulation (PWM) signal and a DC main voltage. The system also includes an AC/DC converter to generate the DC main voltage based on an AC input voltage. The system further includes a power supply controller to generate the PWM signal based on feedback associated with the output voltage. The power supply controller includes a fault controller to detect an overvoltage condition associated with the power supply and to cause the AC/DC converter to disable the DC main voltage in response to the overvoltage condition. 1. A power supply system comprising:a power supply to generate an output voltage based on a pulse-width modulation (PWM) signal and a DC main voltage;an AC/DC converter to generate the DC main voltage based on an AC input voltage;a power supply controller to generate the PWM signal based on feedback associated with the output voltage, the power supply controller comprising a fault controller to detect an overvoltage condition associated with the power supply and to cause the AC/DC converter to disable the DC main voltage in response to the overvoltage condition.2. The system of claim 1 , wherein the power supply controller is to detect the overvoltage condition based on a feedback voltage associated with the output voltage.3. The system of claim 1 , wherein the AC/DC is further to generate a DC auxiliary voltage based on the AC input voltage and to continuously maintain the auxiliary voltage after disabling the DC main voltage.4. The system of claim 3 , further comprising a DC/DC converter to generate a startup voltage based on the auxiliary voltage claim 3 , the startup voltage being provided to the power supply controller to provide power to the fault controller.5. The system of claim 4 , wherein the power supply controller is to initiate a startup procedure based on the startup voltage and to provide an enable ...

SHORT-CIRCUIT PROTECTION FOR VOLTAGE REGULATORS

Circuits and methods for providing short-circuit protection in a voltage regulator are disclosed. A voltage regulator includes a pass switch, a voltage error amplifier, a driver circuit, and a short-circuit protection circuit. The pass element is coupled to a power supply and a load, and generates an output voltage in response to a drive signal. The voltage error amplifier generates an error voltage based on a difference of a reference voltage and the output voltage and the driver circuit generates the drive signal in response to the error voltage. The short-circuit protection circuit senses the drive signal and provides a high-resistance path to the driver circuit in a short-circuit event. In a short-circuit event, the high-resistance path clamps current in the driver circuit thereby clamping a voltage difference between the first and third terminals and thereby limiting a load current in the short-circuit event. 1. A voltage regulator , comprising:a pass switch for electrically coupling a power supply with a load during an ON-state of the pass switch and for electrically decoupling the power supply from the load during an OFF-state of the pass switch, the pass-switch comprising a first terminal, a second terminal and a third terminal, the first terminal coupled to the power supply and the second terminal coupled to the load, the pass switch configured to generate an output voltage at the second terminal in response to a drive signal received at the third terminal;a voltage error amplifier comprising a first input terminal, a second input terminal and an output terminal, configured to receive a reference voltage at the first input terminal and the output voltage at the second input terminal, and further configured to generate an error voltage at the output terminal based on a difference of the reference voltage and the output voltage;a driver circuit coupled to the voltage error amplifier at the output terminal and to the pass switch at the third terminal, the ...

CIRCUITS AND DEVICES RELATED TO OVERCURRENT PROTECTION

Circuits and devices related to overcurrent protection. In some embodiments, a voltage converter can include a voltage converting circuit configured to receive an input voltage and generate an output voltage. The voltage converter can further include an overcurrent protection circuit coupled to the voltage converting circuit and having a detection unit configured to detect an overcurrent condition associated with the voltage converting circuit and generate an overcurrent signal indicative of the overcurrent condition. The overcurrent protection circuit can further include a consumption unit in communication with the detection unit and configured to selectively consume and thereby reduce a current in a path associated with the voltage converting circuit upon receipt of the overcurrent signal. 1. A voltage converter comprising:a voltage converting circuit configured to receive an input voltage and generate an output voltage; andan overcurrent protection circuit coupled to the voltage converting circuit and including a detection unit configured to detect an overcurrent condition associated with the voltage converting circuit and generate an overcurrent signal indicative of the overcurrent condition, the overcurrent protection circuit further including a consumption unit in communication with the detection unit and configured to selectively consume and thereby reduce a current in a path associated with the voltage converting circuit upon receipt of the overcurrent signal.2. The voltage converter of wherein the consumption unit is further configured to consume less of the current when the overcurrent signal ceases.3. The voltage converter of wherein the consumption unit is configured to consume substantially none of the current when the overcurrent signal ceases.4. The voltage converter of wherein the path is an output path of the voltage converting circuit.5. The voltage converter of wherein the detection unit is coupled to the output path of the voltage converting ...

CIRCUIT AND METHOD FOR PROTECTING A VOLTAGE REGULATING CIRCUIT AGAINST ELECTROSTATIC DISCHARGES

An integrated circuit includes a voltage regulating circuit in the form of only one transistor, or a group of several transistors in parallel, that are connected between first and second terminals configured to be coupled to an antenna. A control circuit operates to make the voltage regulating circuit inactive when a pulse generated by an electrostatic discharge event appears at one of the first and second terminals, regardless of the direction of flow of the pulse between the first and second terminals. An electrostatic discharge circuit is further provided to address the electrostatic discharge event. 1. An integrated circuit , comprising:a first terminal and a second terminal configured to be coupled to an antenna,a processing circuit coupled between the first and second terminals,a voltage regulating circuit configured to regulate a voltage between the first and second terminals, wherein the voltage regulating circuit includes only one transistor, or a group of several transistors in parallel, connected between the first and second terminals,a protection circuit configured to protect the processing circuit in the event of an electrostatic discharge while the integrated circuit is not powered, anda control circuit configured to make the voltage regulating circuit inactive during the event of the electrostatic discharge while the integrated circuit is not powered regardless of a direction of flow of a pulse between the first and second terminals resulting from said event of the electrostatic discharge.2. The circuit according to claim 1 , wherein the control circuit is connected to a gate of the only one transistor claim 1 , or group of several transistors in parallel claim 1 , of the voltage regulating circuit and is configured to:connect said gate to the second terminal when the flow of the pulse from said event of the electrostatic discharge is from the first terminal towards the second terminal, andconnect said gate to the first terminal when the flow of the ...