АКТИВНЫЙ ДЕМПФЕР

Изобретение относится к области электротехники и может быть использовано в преобразователях мощности. Переключающие ячейки для ветвей фаз преобразователя мощности содержат переключатель мощности для проведения тока для возбуждения нагрузки, последовательно соединенные вспомогательный переключатель и конденсатор ячейки, причем последовательное соединение подключено параллельно переключателю мощности, и элемент индуктивности ячейки, подключенный к подключению переключателя мощности и последовательного соединения. Каждая упомянутая переключающая ячейка имеет контур коммутации для проведения тока коммутации, возникающего в результате выключения переключателя мощности, который содержит первую шунтирующую схему для блокирования протекания тока в некотором направлении, подключенную параллельно переключателю мощности для проведения упомянутого тока коммутации в другом, противоположном направлении, вторую шунтирующую схему для блокирования протекания тока в некотором направлении, подключенную параллельно ...

СТРУКТУРА ПАРАЛЛЕЛЬНОГО МОДУЛЬНОГО ПРЕОБРАЗОВАТЕЛЯ

ИНВЕРТОР С ВЫСОКОЙ УДЕЛЬНОЙ МОЩНОСТЬЮ

УСТРОЙСТВО ПРЕОБРАЗОВАНИЯ ПИТАНИЯ

WECHSELSTROMGENERATOR UND DARIN ENTHALTENER GLEICHRICHTER

Ein Wechselstromgenerator und ein dazu gehöriger Gleichrichter werden bereitgestellt. Der Gleichrichter enthält einen Gleichrichtertransistor, eine Gate-Treiberschaltung und eine Spannungsklemmschaltung. Der Gleichrichtertransistor erzeugt eine gleichgerichtete Spannung entsprechend einer Eingangsspannung und wird durch eine Gatespannung gesteuert. Die Gate-Treiberschaltung erzeugt die Gatespannung entsprechend einer Differenz zwischen der gleichgerichteten Spannung und der Eingangsspannung. Die Gate-Treiberschaltung stellt die Gatespannung in einem ersten Zeitintervall bereit, wenn die Differenz kleiner als die erste vorbestimmte Schwellenspannung ist, und macht die Differenz gleich der ersten Referenzspannung. Die Gate-Treiberschaltung stellt die Gatespannung in einem zweiten Zeitintervall ein und die Differenz ist gleich der zweiten Referenzspannung. In dem zweiten Zeitintervall klemmt die Spannungsklemmschaltung die Gatespannung, indem sie die Differenz mit der dritten Referenzspannung ...

Schaltnetzteil

Das Schaltnetzteil weist ein Speicherkondensator (C1), einen Transformator (TR) mit einer Primärwicklung und mindestens einer Sekundärwicklung, sowie einen Schalttransistor (T1) auf, der in Serie zu der Primärwicklung geschaltet ist. Die Primärwicklung ist hierbei in Teilwicklungen (W1a, W1b) mit mindestens einem Abgriff (A) unterteilt, und als Dämpfungsnetzwerk ist eine Kapazität (C2, C3) jeweils parallel zu Teilwicklungen, vorzugsweise zu jeder Teilwicklung (W1a, W1b), angeordnet. Die Windungszahlen der Teilwicklungen sowie die Kapazitäten der parallel zu den Teilwicklungen angeordneten Kondensatoren sind derart gewählt, daß die beim Abschalten des Schalttransistors entstehenden Schwingungen unterschiedliche Resonanzfrequenzen aufweisen und sich hierdurch teilweise auslöschen. Dies führt zu einer effektiven Dämpfung der Abschaltspannung (U2) über dem Schalttransitor. Da die Kondensatoren (C2, C3) in Serie geschaltet sind, ist die effektive Gesamtkapazität klein, so daß der resultierende ...

Verfahren zum Erzeugen von Steuersignalen

Gleichrichtervorrichtung

Eine Gleichrichtervorrichtung beinhaltet ein Halbleitersubstrat, einen Anodenanschluss und einen Kathodenanschluss, die durch einen Laststrompfad eines ersten MOS-Transistors und eine Diode, die mit dem Laststrompfad parallel verbunden ist, verbunden sind. Im Betrieb wird eine Wechseleingangsspannung zwischen dem Anodenanschluss und dem Kathodenanschluss angelegt. Ferner ist ein Steuerschaltkreis mit einer Gate-Elektrode des ersten MOS-Transistors gekoppelt und dazu konfiguriert, den ersten MOS-Transistor für eine Ein-Zeitperiode einzuschalten, während der die Diode in Durchlassrichtung vorgespannt ist. Ein Gate-Treiberschaltkreis ist in dem Steuerschaltkreis enthalten und beinhaltet einen Pufferkondensator und eine Kaskade aus zwei oder mehr Transistorstufen, die zwischen den Pufferkondensator und die Gate-Elektrode des ersten MOS-Transistors gekoppelt sind.

Isolierter DC/DC-Wandler, Steuereinheit für isolierten DC/DC-Wandler und DC/AC-Wandler

Ein isolierter DC/DC-Wandler, welcher umfasst:einen DC/AC-Wandler (3), der so konfiguriert ist, dass er durch einen Betrieb von Halbleiterschaltvorrichtungen (3a, 3b, 3c, 3d) eine DC/AC-Umwandlung durchführt;einen Isolationstransformator (5), der so konfiguriert ist, dass er eine AC-Ausgangsspannung des DC/AC-Wandlers (3) isoliert, um die AC-Ausgangsspannung in eine vorbestimmte Größe zu transformieren;eine Gleichrichterschaltung (6), die so konfiguriert ist, dass sie die AC-Ausgangsspannung des Isolationstransformators (5) in eine DC-Spannung umwandelt; undeine Steuereinheit (20), die so konfiguriert ist, dass sie die Halbleiterschaltvorrichtungen (3a, 3b, 3c, 3d) treibt,wobei die Steuereinheit (20) umfasst:eine DC-Eingangsleistungs-Berechnungseinheit, die so konfiguriert ist, dass sie eine DC-Eingangsleistung des DC/AC-Wandlers (3) berechnet;eine erste Anpassungseinheit, die so konfiguriert ist, dass sie einen DC-Eingangsleistungs-Befehlswert berechnet, sodass ein DC-Ausgangsspannungs-Messwert ...

Leistungsumwandlungsvorrichtung

Die vorliegende Erfindung bezieht sich auf eine Leistungsumwandlungsvorrichtung 1, umfassend: mindestens einen Resonanzkreis 17, der mindestens einen Resonanzinduktor Lr und mindestens einen Resonanzkondensator Cr umfasst; einen ersten Transformator T1, der eine erste Primärwicklung N1, die mit dem Resonanzkreis 17 elektrisch verbunden ist, und mindestens eine erste Sekundärwicklung S1 umfasst; und einen zweiten Transformator T2, der eine zweite Primärwicklung N2, die mit dem Resonanzkreis 17 elektrisch verbunden ist, und mindestens eine zweite Sekundärwicklung S2 umfasst, wobei die zweite Primärwicklung N2 und die erste Primärwicklung N1 parallel geschaltet sind und die gleiche Anzahl von Spulenwindungen aufweisen und die zweite Sekundärwicklung S2 und die erste Sekundärwicklung S1 die gleiche Anzahl von Spulenwindungen aufweisen; wobei eine Abweichung der Induktivität zwischen der ersten Primärwicklung N1 und der zweiten Primärwicklung N2 |Lm1-Lm2|/(Lm1+Lm2)<=30% beträgt, wobei Lm1 die ...

ZWEISTUFIGER MEHRPHASIGER SCHALTSTROMRICHTER MIT ZWISCHENSTUFENPHASENABSCHALTSTEUERUNG

Ein zweistufiger mehrphasiger Schaltstromrichter betätigt seine erste Stufe während des Nennbetriebs als Reaktion auf eine Nenntaktfrequenz und betätigt seine zweite Stufe während des Nennbetriebs als Reaktion auf eine Taktfrequenz der zweiten Stufe, die größer als die Nenntaktfrequenz ist. Als Reaktion auf das Anlegen einer Last erhöht die erste Stufe zeitweilig ihre Taktfrequenz von der Nenntaktfrequenz und setzt ein festes Tastverhältnis um.

Ansteuerung einer Halbbrückenschaltung

Beschrieben wird ein Verfahren zur Ansteuerung einer Halbbrückenschaltung, die zwei Halbleiterschaltelemente (1, 2) mit jeweils einer Laststrecke und einem Ansteueranschluss und die zwei Freilaufelemente (3, 4) aufweist, von denen jeweils eines parallel zu der Laststrecke eines der Halbleiterschaltelemente (1, 2) geschaltet ist. Das Verfahren umfasst das Verhindern einer leitenden Ansteuerung wenigstens eines der beiden Halbleiterschaltelemente (1, 2) wenigstens während einer Zeitdauer, während der dessen Freilaufelement (3, 4) in Flussrichtung gepolt ist.

Inverter circuit and method for operating an inverter circuit

An inverter circuit 110 comprises a series-connected arrangement of two switching elements 145, 147, connected in series between an input connection 150 and a first intermediate connection 152. Both switching elements have a parallel connected arrangement of a controllable switch T5, T6 and a diode D5, D6, where the first diode D5 is poled in a direction other than that of the second diode D6. A third switching element 155 is disposed between the first intermediate connection and the output connection 140, having a parallel connected arrangement of a third controllable switch T2 and a third diode D2 having its cathode connected to the first intermediate connection and its anode connected to the output connection. A fourth switching element 160 is disposed between the output connection 140 and a second intermediate connection 157, having a parallel connected arrangement of a fourth controllable switch T3 and a fourth diode D3 having its cathode connected to the output connection and its ...

Power converter for railway vehicle and railway vehicle having the same

A power converter for a railway vehicle includes a step-up/down chopper 4 that steps up or steps down a voltage received from a DC power supply 1 and outputs the stepped up/down voltage to a DC-AC inverter device 6, which converts the DC power into three-phase AC power and supplies the converted power to an AC motor 7. The step-up/down chopper steps down the DC supply voltage when the output of the inverter decreases and steps up the DC supply voltage when the output of the inverter increases. The output of the inverter may be one of: a frequency of the three-phase AC voltage of the inverter; a voltage amplitude of the three-phase AC voltage of the inverter; a rotation frequency of the AC motor; and a speed of the railway vehicle. By reducing the voltage on the DC side of the inverter, losses caused by harmonic current can be reduced.

Active Snubber

Snubber

An energy recovery snubber circuit for a power converter comprises a flyback transformer driven by a converter switch M1. The snubber circuit comprises two capacitors Cl, C2 which are connected such that, when the snubber circuit is connected to a primary winding L1a of the flyback transformer, the capacitors are charged in series by current flowing in a first direction in the primary winding when switch Ml is turned OFF, to recover energy stored in the leakage inductance of the transformer, and discharged in parallel to cause current flow in a second direction in the primary winding of the transformer, to thereby transfer the recovered energy to the transformer. A snubber switch M2 may be connected between the primary winding of the transformer and the capacitors such that the capacitors are discharged in parallel when switch M2 is on.

Dc-dc converter with a dynamically adapting load-line

LOW-RESISTANCE BIPOLAR BRIDGE CONNECTION

Verfahren zur Regelung einer Gleichrichterschaltung

Die Erfindung betrifft ein Verfahren zur Regelung der Zwischenkreisspannung (U0c) einer Gleichrichterschaltung mit einer Gleichrichtanordnung (1) von regelbaren Schaltelementen (T1, Tz, T3, T4, Ts, T6), vorzugsweise IGBT-Modulen, und einer netzseitigen Eingangsspannung (uNl,UNz,UN3L bei der erfindungsgemäß vorgeschlagen wird, dass die Zwischenkreisspannung (Uoc) auf einen Sollwert (Uoc,ret) geregelt wird, dessen Verhältnis zum Scheitelwert (ÜN) der netzseitigen Eingangsspannung (uN1,uN2,uN3) konstant ist. Falls sich der Scheitelwert (ÜN) der netzseitigen Eingangsspannung (uN1,uN2,uN3) ändert, ändert sich somit auch der Sollwert (Uoc,ref) für die Regelung der Zwischenkreisspannung (U0c). Mithilfe einer solchen Regelung lassen sich Schaltungsverluste reduzieren und die Effizienz der Schaltung erhöhen.

PULSE INVERTER WITH VARIABLE SWITCHING FREQUENCY AND WIND ENERGY PLANT WITH A PULSE INVERTER

Method and system for constant temperature control of motorized spindles

The present invention provides a method and system for controlling the temperature of an electric motor by adjusting the electric losses in the motor. In an embodiment, the required load on the motor is determined and a first motor voltage is provided to meet the required load. A predetermined temperature set point for the motor is compared against the temperature of the motor and based on the temperature of the motor and the predetermined temperature set point, a secondary motor voltage is determined. The motor voltage may then be adjusted based on the calculated voltage and the motor load measurement adjusted based on the measured motor speed and actual motor voltage.

High efficiency photovoltaic inverter

Power conversion circuit

By outputting a compensation current in segments other than those during which leakage current is not prominent, this power conversion circuit reduces loss due to providing a compensation current. A converter (11) inputs an alternating current from an AC source (3), and rectifies and outputs the same to a DC link (15). An inverter (14) is connected with a converter (11) through the DC link (15), converts the direct current to an alternating current, and outputs this alternating current to the load (4). A leakage current detector (21) outputs a detected current (Ib) corresponding to the leakage current (Ia) leaked from the load (4). A compensation current output terminal (223) connects to a position (41) where the leakage current (Ia) leaks, and, in response to the detection current (Ib), outputs a compensation voltage (Ic) which compensates for the leakage voltage (Ia). A switch (8) sets whether or not the detection voltage (Ib) can be inputted to the compensation current output unit (22 ...

Power converter with controllable DC offset

An electrical power conversion system includes an alternating current (AC)-to-direct current (DC) power converter that is configured to convert power between AC power and DC power. The AC-to-DC power converter includes switching legs that each connect to a phase of the AC power. Each of the switching legs includes two electronic devices connected in series with one another between a positive DC bus terminal and a negative DC bus terminal. The electrical power conversion system also includes a DC-to-DC power converter that is configured to convert power between the DC bus power and DC terminal power via a positive DC terminal and a negative DC terminal. The DC-to-DC power converter is configured to control a differential voltage between the positive and negative DC terminals and a common-mode voltage that is between a neutral of the AC power and each of the positive and negative DC terminals.

A resonant converter

PARALLEL MODULAR CONVERTER ARCHITECTURE

POWER CONVERTER WITH CONTROLLABLE DC OFFSET

An electrical power conversion system includes an alternating current (AC)-to-direct current (DC) power converter that is configured to convert power between AC power and DC power. The AC-to-DC power converter includes switching legs that each connect to a phase of the AC power. Each of the switching legs includes two electronic devices connected in series with one another between a positive DC bus terminal and a negative DC bus terminal. The electrical power conversion system also includes a DC-to-DC power converter that is configured to convert power between the DC bus power and DC terminal power via a positive DC terminal and a negative DC terminal. The DC-to-DC power converter is configured to control a differential voltage between the positive and negative DC terminals and a common-mode voltage that is between a neutral of the AC power and each of the positive and negative DC terminals.

METHOD OF CONTROLLING THE SWITCHING OF A MULTILEVEL CONVERTER, A CONTROLLER FOR A MULTILEVEL CONVERTER, AND A COMPUTER PROGRAM FOR CONTROLLING A CONVERTER

A method of controlling a multilevel converter, a computer program and a controller for a converter is provided. The method includes determining a transition voltage (vstep) from a control period (k) to a following control period (k+1), analyzing (104) the switching cells (SC1, SC2, SC3, SCn) of each phase leg, selecting (111) capacitors to provide the transition voltage and synthesize the output voltage for the following control period (k+1), and connecting (113) the selected capacitors during the following control period (k+1). Especially, the analyzing (104) of each switching cell (SC1; SC2; SC3; SCn) comprises analyzing (104) a first switching leg (SL1) and a second switching leg (SL1) of the switching cell (SC1; SC2; SC3; SCn), and the method includes determining (105) whether a change of state of the first switching leg (SL1) would contribute to the direction of the transition voltage, and determining (105) whether a change of state of the second switching leg (SL2) would contribute ...

Circuit for a multi-level static frequency changer with thyristor change-over.

Diese Schaltung für einen Multilevel-Umrichter besteht aus einzelnen Zellen, welche aus einem Zwischenkreiskondensator, sowie für jede Phase aus 2 Halbleiterschaltern (S1N, S1P, S2N, S2P), 2 Freilaufdioden (D1N, D1P, D2N, D2P) und 2 Thyristoren (T1P, T1N, T2P, T2N) besteht. Die Zwischenkreise der Zellen werden in Serie zusammengeschaltet, die zu einer Phase gehörenden Thyristoren aller Zellen sind zusammengeschaltet und bilden den Phasenausgang des Umrichters. Bei jeder Phase ist jeweils ein Thyristor eingeschaltet, welcher so die für diese Phase aktive Zelle auswählt. Um das Umschalten der Thyristoren zu ermöglichen, wird eine zusätzliche Spannungsquelle benötigt.

circuito de suprimento de potência de comutação

Multi-level hysteresis voltage controllers for voltage modulators and methods for control thereof

Systems and methods that facilitate multilevel hysteresis voltage control methods for cascaded multilevel voltage modulators having a plurality of power cells connected in series and has any positive integer number of output voltage levels to control any unipolar voltage on the load of the voltage modulator, and transfer electrical power from an electrical grid via AC/DC converters or directly from energy storage elements of the power cells to that load. A method of operational rotation of the power cells of a multilevel voltage modulator, which ensures an equal power sharing among the power cells and voltage balancing of the energy storage elements of the power cells of the modulator.

Programmable power converter with reduced power loss and power-loss-reduced power transmission circuit thereof

KAPPA SWITCHING DC-DC CONVERTER WITH CONTINUOUS INPUT AND OUTPUT CURRENTS

The Kappa converter circuit, as introduced herein, can be configured for step-down (buck), step-up (boost), or buck-boost operation. The Kappa converter circuit exhibits lower electromagnetic interference (EMI) relative to other buck, boost, or buck-boost topologies, such as without additional input or output filter circuits. The Kappa converter circuit can have high power handling capability and less DCR loss, for example due to a distribution of current signals through respective inductors. The Kappa converter circuit includes isolating inductors at its input and ground reference nodes to help reduce signal bounce or signal pulsations at supply and ground reference busses, thereby further reducing EMI noise due to switching in the circuit. When the Kappa converter is configured for step-up operation, the converter exhibits no right-half-plane (RHP) zero.

Determining a target value for a signal indicating a current or a voltage through primary-side switch based on another signal indicating a current or a voltage through an auxiliary winding on a primary side of transformer

In some examples, a controller is configured to control a primary-side switch in a power converter circuit, and the controller includes a first node configured to receive a first signal indicating a current or a voltage through a primary side of a transformer of the power converter circuit. The controller also includes a second node configured to receive a second signal indicating a current or a voltage through a primary-side switch of the power converter circuit. The controller further includes processing circuitry configured to determine a target value for the second signal based on the first signal and generate the control signal for the primary-side switch based on the target value for the second signal.

ELECTRIC VEHICLE BATTERY CHARGER COMPRISING A PFC CIRCUIT

The battery charger (C) for electric vehicles comprises a voltage converter (DC/DC CONY), a power factor correction circuit (PFC) connected upstream of the voltage converter (DC/DC CONY), a controller circuit (PFC CNTR) operatively connected to the correction circuit (PFC) and suitable for piloting the correction circuit (PFC) for the correction of the power factor in the battery charger (C), a retroaction line (L) connected to the output of the voltage converter (DC/DC CONY) and to an input of the controller circuit (PFC CNTR), wherein the controller circuit (PFC CNTR) is suitable for varying the output voltage (VPFC) of the correction circuit (PFC) within a predefined voltage interval and according to the output voltage (VDCOUT) of the voltage converter (DC/DC CONY), in order to let the voltage converter (DC/DC CONY) operate as much as possible around the point of maximum efficiency.

Parallel modular converter architecture

A system and method for providing power to a vehicle is disclosed. The system can include a plurality of parallel module converter modules (“modules”) each capable of supplying a predetermined electrical load. The plurality of parallel module converter modules can be networked to form a parallel module converter (“converter”) for prioritizing and allocating each electrical load to one or more parallel module converter modules. Each module can include an internal protection controller and a logic controller. The individual modules can provide power to various loads in the vehicle either alone, or in concert with other modules. The system can enable fewer power controllers to be used, saving weight and time. The controllers in the system can also be utilized at a higher level reducing unnecessary redundancy.

Non-contact electric power feeding system, terminal device, non-contact electric power feeding device, and non-contact electric power feeding method

Provided is a non-contact electric power feeding system including an electric power feeding device, and an electric power receiving device configured to receive electric power fed from the electric power feeding device. The electric power feeding device includes a primary-side coil, a driver, a primary-side control unit, and a primary-side communication unit. The electric power receiving device includes a secondary-side coil, a rectifier unit, a regulator, a secondary-side communication unit, and a secondary-side control unit.

Switching power source circuit capable of turning off an "off" drive circuit before a drive control signal becomes active and an electronic device using the same

A pulse width control circuit provided in a drive circuit instructs an OFF drive circuit to operate for a period shorter than an inactive period of a drive control signal. Thus, when the drive control signal is inactive, the OFF drive circuit begins operating, and draws a current from a base of a switching element, thereby turning OFF the switching element. Further, the OFF drive circuit stops operating before the drive control signal becomes active.

CIRCUIT IMPLEMENTATIONS REDUCING LOSSES IN A POWER SUPPLY

A power supply circuit includes a control switch, a synchronous switch, an inductor, and a voltage ramping circuit. A common node in the power supply serially connects the control switch to the synchronous switch. The common node is further coupled to the inductor that supplies current to a load based on switching the control switch and the synchronous switch to respective ON/OFF and OFF/ON states. The voltage ramping circuit generates and controls ramping of a gate voltage of the control switch based at least in part on a magnitude of a feedback voltage received on a circuit path from the common node. The multi-stage ramping of a switch control voltage reduces one or more of the following: i) QRR losses, ii) switching losses, and/or iii) a dead time of the power supply.

Driving circuit and method for buck-boost converter with bootstrap voltage refresh

A driving circuit and method for buck-boost converter with bootstrap voltage refresh. The driving circuit includes a first bootstrap capacitor provided a first bootstrap voltage to drive the corresponding switch, and a second bootstrap capacitor provided a second bootstrap voltage to drive the corresponding switch. When converter operates in buck mode and the first or second bootstrap voltage is smaller than a threshold, the driving circuit generates current signals to respectively charge the first and second bootstrap capacitors based on an input voltage, and the first and second bootstrap voltages. When converter operates in boost mode and the first or second bootstrap voltage is smaller than the threshold, the driving circuit generates current signals to respectively charge the first and second bootstrap capacitors based on an output voltage, and the first and second bootstrap voltages.

Switching regulator

A switching regulator includes a first switch; a second switch coupled between the first switch and ground; an inductor coupled to a common node between the first and second switches; a capacitor coupled between the inductor and ground; a controller receiving a disable signal, and generating first and second control signals respectively for the first and second switches; and a crossing detector comparing an auxiliary voltage at the common node with a negative reference voltage to generate a comparison signal, and generating the disable signal based on the first control signal and the comparison signal. The second control signal switches into an inactive state upon the disable signal indicating a reference-crossing of the auxiliary voltage.

Switching power supply apparatus including controller that switches a switching unit based on the amount of charge in a charge unit

A switching power supply apparatus includes an isolated converter that has efficiency characteristics in which power conversion efficiency at a rated load is higher than power conversion efficiency at a light load and that converts power-supply voltage into direct-current voltage to output the direct-current voltage; an FET that switches supply and shutoff of the power-supply voltage to the isolated converter; a secondary battery that stores the direct-current voltage output from the isolated converter; a voltage detector that detects an amount of charge in the secondary battery; and a controller that switches the FET on the basis of the amount of charge in the secondary battery.

CONTROLLER WITH VARIABLE SAMPLING GENERATOR

A controller for use in a power converter includes a comparator configured to compare a sense signal representative of an amount of energy delivered to an output of the power converter, to a target value. An update clock generator configured to receive the sense signal and to generate a clock signal having a clock frequency in response to the sense signal. A request control coupled to the comparator and to the update clock generator, the request control configured to generate a request signal having a request frequency that is responsive to an output of the comparator and that controls an operational state of a power switch of the power converter. The request control further configured to update a rate at which the request frequency of the request signal is responsive to the clock frequency of the clock signal.

Vehicle battery external loading device including an AC/DC converter having a resonant insulated stage

The invention relates to a device (2) for charging a motor-driven device battery (5). Said charging device (2) includes: a first conversion module (3); a second conversion module (4); and a means (6) for controlling the first conversion module (3). The first conversion module (3) is suitable for converting an input AC current into an intermediate current and supplying said intermediate current to the second conversion module (4). The second conversion module (4) is suitable for converting the intermediate current into an output current and supplying said output current to the battery (5). The intermediate current is direct current, and the output current is also direct current. The controlling means (6) is suitable for adjusting the voltage of the intermediate current on the basis of operating parameters of the second conversion module (3).

High efficiency photovoltaic inverter

A photovoltaic (PV) inverter includes a single DC to AC converter configured to operate solely in a buck mode for PV array voltage levels greater than a connected power grid instantaneous voltage plus converter margin, and further configured to operate solely in a boost mode for PV array voltage levels plus margin less than the connected power grid instantaneous voltage, such that the PV inverter generates a rectified sine wave current in response to the available PV array power, and further such that the PV inverter generates a utility grid current in response to the rectified sine wave current.

Power conversion device and power conversion method

A power conversion device includes a switching circuit and a switch driver. The switching circuit includes a plurality of switching elements including a first switching element and a second switching element that are electrically coupled in series. The switch driver includes a first, a second, and a third switching pattern controller. The first switching pattern controller executes a first switching pattern which is set such that a current in a reverse direction flows through the first switching element and the second switching element is off. The second switching pattern controller executes a second switching pattern which is set such that a direction of the current flowing through the first switching element is switched to a forward direction from the reverse direction. The third switching pattern controller executes a third switching pattern which is set such that the first switching element is off and the second switching element is on.

Coupling device for a multi-phase converter

The invention relates to a coupling device (4) for four phases of a multi-phase converter (2). Said coupling device (4) includes four coupling modules (6, 8, 12, 14), each of which encompasses four parallel through-holes. At least one section of a conductor loop (18, 20, 22, 24) for a phase. At least one section of a conductor loop (18, 20, 22, 24) for a phase penetrates a through-hole of a coupling module (6, 8, 12, 14), sections of conductor loops (18, 20, 22, 24) for at least two phases penetrating all four through-holes of a coupling module (6, 8, 12, 14).

Charging device, charging method, power adapter and terminal

The present disclosure discloses a charging device, a charging method, a power adapter and a terminal. The device includes: a charging receiving terminal configured to receive a first alternating current; a voltage adjusting circuit, including a first rectifier configured to rectify the first alternating current and output a first voltage with a first ripple waveform, a switch unit configured to modulate the first voltage according to a control signal to obtain a modulated first voltage, a transformer configured to output a plurality of voltages with ripple waveforms according to the modulated first voltage, and a compositing unit configured to composite the plurality of voltages to output a second alternating current; and a central control module configured to output the control signal to the switch unit so as to adjust voltage and/or current of the second alternating current in response to a charging requirement of the battery.

High efficiency passive clamp

A circuit having primary and secondary sides includes a flyback converter having an input voltage source and a transformer with primary and secondary windings. A main switch is in series with the primary winding. A passive clamp circuit includes a clamp diode, a clamp capacitor, and an auxiliary circuit including first and second rectifiers in series with each other and with an electronic component configured to store electromagnetic energy. The electronic component has first and second terminals. A cathode of the first rectifier is connected with the passive clamp circuit, and an anode of the first rectifier is connected to the second terminal of electronic component. An anode of the second rectifier is connected with the cathode of the first rectifier, and a cathode of the second rectifier is connected with the first terminal of the electronic component.

Control circuit for synchronous rectifiers in DC/DC converters to reduce body diode conduction losses

A controller for a switching power supply having first and second synchronous rectifiers that minimizes the reverse recovery time and body diode conduction losses of each of the synchronous rectifiers. The controller includes a first controller that predicts the optimal turn-on and turn-off time of the first synchronous rectifier as a function of voltage measurements of the previous switching cycle and the timing of the pulse width modulator signal in the current switching cycle. The controller also includes a second controller that predicts the optimal turn-on and turn-off time of the second synchronous rectifier as a function of voltage measurements of the previous switching cycle and the timing of the pulse width modulator signal in the current switching cycle.

CHARGING/DISCHARGING CIRCUIT FOR ELECTROMECHANICAL ENERGY CONVERSION AND ELECTROMECHANICAL ENERGY CONVERSION SYSTEM

Electronic device (1) for charging and discharging a capacitor (10) from and to a power source (30). The electronic device is connectable to the capacitor and to the power source, and includes a first circuit (SI, D, R1, LI) for charging the capacitor and at least one second circuit (S2, D, R2, L2) for discharging the capacitor. The capacitor is connected to the first circuit in a charge line (31) and is connected to the second circuit in a discharge line (32). Both the charge line and discharge line are connectable to the power source. The first circuit is arranged as a first buck converter circuit and the at least one second circuit is arranged as a second buck converter circuit.

Method for controlling a full bridge converter with a current-doubler

A method controls a Full Bridge converter with a Current-Doubler of the type including at least a first and a second half-bridges of diodes connected to respective control transistors. The method includes detecting a reference value, comparing, instant by instant, the reference value with an output voltage value of the converter, and carrying out a switching from a transfer phase to an energy recirculation phase in correspondence with instants when the output voltage value reaches the reference value.

VOLTAGE CONVERTER WITH SWITCH CONTROL CIRCUITRY

A voltage converter is provided. The voltage converter comprises a switching circuit that includes a first pair of switches and a second pair of switches. The voltage converter comprises a transformer having a magnetizing inductance and a leakage inductance that are a function of a windings ratio of the transformer. The voltage converter comprises a capacitor coupled to the transformer and the switching circuit. The voltage converter comprises a switch control circuit configured to generate a frequency for controlling the first pair of switches and the second pair of switches. The frequency is set of a value to control the pairs of switches so that a peak capacitor voltage of the capacitor is a factor of an output voltage of the voltage converter and the windings ratio of the transformer.

CONTROL CIRCUIT FOR ISOLATED POWER SUPPLY, AND ISOLATED POWER SUPPLY AND CONTROL METHOD THEREFOR

A control circuit (101) for an isolated power supply, an isolated power supply and a control method therefor. The control circuit (101) for the isolated power supply includes a secondary-side control signal generator (102) and a primary-side control signal generator (103). The secondary-side control signal generator (102) produces a secondary-side transistor switch control signal (SRoff) containing information about a turn-off instant (K2) of a secondary-side synchronous rectification transistor (SR), which serves as a second turn-on instant (K2). The primary-side control signal generator (103) derives, from a feedback signal (VFB), a supposed turn-on instant for a primary-side transistor switch (Q1), which serves as a first turn-on instant (K1). The primary side turn-on signal generator (103) further derives a turn-on instant for the primary-side transistor switch (Q1) from the second turn-on instant (K2) or the first turn-on instant (K1) whichever is later and responsively generates a ...

ПРЕОБРАЗОВАТЕЛЬ ЭЛЕКТРИЧЕСКОЙ ЭНЕРГИИ

DC-DC-Wandler

Es wird ein DC-DC-Wandler (1, 101) angegeben, der so konfiguriert ist, dass er eine Gleichspannung (Vin) erniedrigt und dann an eine Last (R1) abgibt, wobei der DC-DC-Wandler (1, 101) folgendes umfasst: ein Schaltelement (Q1), das die Gleichspannung durch Schaltvorgänge in eine Wechselspannung umwandelt, eine Gleichrichter-Einheit (D1), die die Wechselspannung gleichrichtet, einen Ausgangskondensator (C1), der parallel zu der Last (R1) geschaltet ist, und eine Glättungsdrossel (L2, L3), die eine Vielzahl von in Serie geschalteten geteilten Induktionsspulen (La, Lb, Lc, Ld) beinhaltet, wobei zumindest eine der Anzahl von Wicklungen und der Anzahl von Lagen der jeweiligen Wicklungen der geteilten Induktionsspulen (La, Lb, Lc, Ld) der Glättungsdrossel (L2, L3) so angepasst wird, dass eine Gesamtsumme der Induktivitäten der geteilten Induktionsspulen (La, Lb, Lc, Ld) eine gewünschte Induktivität ergeben und dass eine Gesamtsumme der Streukapazitäten der Vielzahl von geteilten Induktionsspulen ...

Getaktete Stromversorgungseinheit mit galvanischer Trennung

Gezeigt wird eine Stromversorgungseinheit mit galvanischer Trennung, zur getakteten Umwandlung einer eingangsseitigen Wechsel- oder Gleichspannung (Uzwk) in eine ausgangsseitige Gleichspannung (Ua), mit einem ersten Primärstromkreis, der eine Serienschaltung einer Primärwicklung (L1, L2) eines Transformators und eines ersten Schaltelementes (M1) zur Impulsdauermodulation der Spannung an der Primärwicklung umfasst sowie eine erste Steuerschaltung (PWM) zur Steuerung des ersten Schaltelementes (M1), mit zumindest einem Sekundärstromkreis, der eine Sekundärwicklung (L3) des Transformators und einen parallel zu einer Ausgangsgleichspannung (Ua) des Sekundärstromkreises liegenden Glättungskondensator (C1) umfasst. Es ist zur Vermeidung von PFC-Schaltungen oder einer Spannungsvervielfachung ein zweiter Primärstromkreis vorgesehen, der eine Serienschaltung eines Teils (L1) der Primärwicklung und eines zweiten Schaltelementes (M2) zur Impulsdauermodulation der Spannung an diesem Teil (L1) der Primärwicklung ...

Leistungswandlerschaltung mit einem getakteten Leistungswandler

Beschrieben wird eine Leistungswandlerschaltung und ein Verfahren zum Betreiben der Leistungswandlerschaltung. Die Leistungswandlerschaltung umfasst wenigstens eine Wandlerstufe und eine Steuerschaltung. Die wenigstens eine Wandlerstufe umfasst einen Eingang, der dazu ausgebildet ist, eine Eingangsleistung zu erhalten, einen Ausgang, der dazu ausgebildet ist, eine Ausgangsleistung bereitzustellen, einen ersten elektronischen Schalter und eine erste Induktivität, die an den ersten elektronischen Schalter gekoppelt ist. Die Steuerschaltung umfasst einen Hysteresecontroller, der dazu ausgebildet ist, den ersten elektronischen Schalter basierend auf einem Strommesssignal, das an den Strom durch die Induktivität repräsentiert, einem ersten Schwellensignal und einem zweiten Schwellensignal anzusteuern, und einen Arbeitspunktcontroller, der dazu ausgebildet ist, einen Arbeitspunkt der Wandlerstufe zu detektieren und das erste Schwellensignal und das zweite Schwellensignal basierend auf dem detektierten ...

Stromversorgungseinheit und Steuerverfahren dafür

Die vorliegende Erfindung stellt eine Stromversorgungseinheit 100 bereit. Zu der Stromversorgungseinheit gehören: mindestens zwei oder mehr Netzgeräte 10 bis 12, die parallel zueinander geschaltet sind, wobei zu jedem Gerät einer der Gleichrichter 15 bis 17 gehört, um einen Gleichstrom von einer Gleichstromquelle oder einen Wechselstrom von einer Wechselstromquelle in eine GS-Nennleistung umzuwandeln, ein Erfassungsmittel 20 für das Erfassen einer Laststromrate von jedem der Netzgeräte, und ein Steuermittel 30. Das Steuermittel steuert den Betrieb der Netzgeräte, um die Gesamtmenge der Leistungsaufnahme pro Netzgerät zu verringern, die auf der Grundlage der GS-Nennleistung der Netzgeräte und des Wirkungsgrads jedes der Netzgeräte berechnet wurde, und die der Laststromrate entspricht. Folglich kann die Leistungsaufnahme der Stromversorgungseinheit gemäß dem Lastzustand und dem Wirkungsgrad der Netzgeräte angemessener verringert werden.

Stromrichtereinrichtung mit einem eine ANPC-Topologie aufweisenden Stromrichter und mit einer Steuereinrichtung

Stromrichtereinrichtung mit einem Stromrichter (2), der einen ersten, zweiten, dritten, vierten, fünften und sechsten Leistungshalbleiterschalter (T1,T2,T3,T4,T5, T6), die jeweilig einen ersten und einen zweiten Laststromanschluss (L1, L2) aufweisen, aufweist und mit einer Steuereinrichtung (3), die zur Ansteuerung dieser Leistungshalbleiterschalter (T1,T2,T3,T4,T5, T6) ausgebildet ist, wobei der zweite Laststromanschluss (L2) des ersten Leistungshalbleiterschalters (T1) mit dem ersten Laststromanschluss (L1) des zweiten Leistungshalbleiterschalters (T2) und mit dem ersten Laststromanschluss (L1) des fünften Leistungshalbleiterschalters (T5) elektrisch leitend verbunden ist, wobei der zweite Laststromanschluss (L2) des zweiten Leistungshalbleiterschalters (T2) mit dem ersten Laststromanschluss (L1) des dritten Leistungshalbleiterschalters (T3) elektrisch leitend verbunden ist, wobei der zweite Laststromanschluss (L2) des dritten Leistungshalbleiterschalters (T3) mit dem ersten Laststromanschluss ...

WECHSELSTROMERZEUGER UND GLEICHRICHTER DAVON

Die Offenbarung sieht einen Wechselstromerzeuger und einen Gleichrichter davon vor. Der Gleichrichter beinhaltet einen Transistor und eine Gate-Ansteuerschaltung. Ein Steuerende des Transistors empfängt eine Gate-Spannung. Die Gate-Ansteuerschaltung erzeugt die Gate-Spannung entsprechend einer Spannungsdifferenz zwischen einer Eingangsspannung und einer Richtspannung. Die Gate-Ansteuerschaltung erkennt einen Anfangszeitpunkt, wenn die Spannungsdifferenz kleiner als eine erste voreingestellte Schwellenspannung ist, liefert die Gate-Spannung, um den Transistor während einer ersten Zeitspanne nach dem Anfangszeitpunkt einzuschalten, und stellt die Spannungsdifferenz gleich einer ersten Referenzspannung ein. Die Gate-Ansteuerschaltung stellt die Spannungsdifferenz gleich einer zweiten Referenzspannung ein, indem sie die Gate-Spannung während einer zweiten Zeitspanne nach der ersten Zeitspanne anpasst.

Switching power supply apparatus

Improvements in or relating to the control of voltage source converters

Power supply source for an electric heating system

Power supply source for an electric heating system. The invention relates to power engineering, in particular to electric heating systems for residential and other buildings. The power supply source for an electric heating system comprises an inductance coil (1), which is connected to a load circuit (4) and is connected to a primary source (3) of electrical energy with the possibility of periodic connection of one of the ends of said coil (9) to one of the terminals of the primary source (3) of electrical energy via an electronic switch (6), and a generator (8) of pulses of single polarity, the output of which generator is connected to the input of the electronic switch (6). According to the invention, the second end (10) of the inductance coil (1) is connected to the second terminal of the primary source (3) of electrical energy via a second electronic switch (7), the input of which is connected to the output of said generator (8) of pulses of single polarity so as to ensure synchronized ...

Controlling voltage in AC power lines

A device for regulating an AC voltage includes a magnetic core 114, multiple windings around the core 116, and multiple switch arrays 110 connectible between an AC power source 100 and respective windings. The switch arrays including multiple switches Q1-Q4 controllable to connect the AC power source to the windings in a first polarity or in a second polarity. The first polarity and second polarity are different polarities, e.g. phase shifted by 180 degrees. An electrical conductor 118 is disposed around or through the core and is series-connectible to a power line. The AC voltage 122 of the power line is regulated by adding an AC voltage of the electrical conductor responsive to selection of the switches of the switch arrays. The magnetic core may include a plurality of magnetic cores, where the electrical conductor is inserted through the magnetic cores. The device may be configured to regulate grid voltage in a mains power line, particularly one with distributed and renewable energy ...

DC- dc converter for implantable medical devices

Power supply unit

A power supply unit 1 includes a first battery unit 2 and a second battery unit 3 connected in series, a transformer 10 having a tapped primary winding, a first switch 40 connected between the positive terminal 4 of the first battery unit 2 and a first end of the primary winding 21, a second switch 41 connected between the negative terminal of the second battery unit 7 and a second end of the primary winding 22, and a controller 70 for controlling the first switch 40 and the second switch 41. The tapped terminal of the primary winding 23 is connected to a node 8 located between the two battery units. The power supply unit further comprises a first return path 50 that provides unidirectional current flow from a first node 51 to a second node 52, and a second return path 60 that provides unidirectional current flow from a third node 61 to a fourth node 62. The first node 51 is located between the negative terminal of the second battery unit 7 and the second switch 41, the second node 52 is ...

Voltage regulation of multi-phase permanent magnet generater

A dc-dc converter

Closed loop headroom management for battery charging

An electronic system can include a charged system and a charging system. The charged system can include a charger and a battery configured to be charged thereby. The charger may be configured to receive power from a charging system that includes a power converter configured to supply power to the charger and a controller configured to control the power converter. The controller may be configured to receive feedback information from the charged system, including one or more voltages. The controller may be further configured to determine an output voltage compensation value for the power converter as a function of the feedback information and to set an output voltage of the power converter as a function of the compensation value. The compensation value and output voltage may be selected to maintain a preselected headroom between a battery charging target voltage of the charger and a voltage supplied to the charger.

ELECTRICAL SWITCHING CONFIGURATION FOR SUPPLYING AN ELECTRICAL DRIVE SYSTEM

Variable push-pull forward converter clocked

Die Erfindung betrifft einen variabel getakteten Gegentaktflusswandler mit Halbbrückenansteuerung , umfassend einen mit einem Gleichspannungsversorgungseingang (V15) verbindbaren Primärschaltkreis (P) und einen mit dem Primärschaltkreis (P) magnetisch gekoppelten Sekundärschaltkreis (S) zur Versorgung eines Spannungsausgangs (V+) mittels einer gewandelten Gleichspannung, wobei eine Primärspule (LP) des Primärschaltkreises (P) wechselweise mit positiven und negativen Spannungsblöcken entsprechend einem durch einen steuerbaren Steueroszillator (IC2) vorgebbaren Takt über eine an den Gleichspannungsversorgungseingang (V15) anlegbare Gleichspannung bestrombar ist, wobei der Sekundärschaltkreis (S) zumindest zwei mit der Primärspule (LP) magnetisch gekoppelte Spulen aufweist, nämlich eine erste Sekundärspule (LS1) und eine zweite Sekundärspule (LS2), über die der Spannungsausgang (V+) wechselweise elektrisch versorgbar ist, dadurch gekennzeichnet, dass eine Überwachungseinrichtung (IC4, IC1, ...

System and method for adaptively controlling a reconfigurable power converter

A reconfigurable power converter (100) is provided that includes a pulse-width modulation (PWM) controller (102). The PWM controller is configured to switch between a first modulation scheme and a second modulation scheme when a current-level property crosses a transition threshold.

Power conversion circuit

By outputting a compensation current in segments other than those during which leakage current is not prominent, this power conversion circuit reduces loss due to providing a compensation current. A diode bridge (11) has a pair of input terminals which input an alternating current from an AC source (3), and a pair of output terminals (111, 112) which output a direct current. A step-up chopper circuit (12) is connected to the pair of output terminals (111, 112), and steps up the inputted direct current voltage. The step-up chopper circuit (12) functions as a power factor correction circuit. A smoothing capacitor (13) is connected to the output side of the step-up chopper circuit (12) and smooths the voltage between the two terminals. An inverter (14) inputs the voltage between both terminals of the smoothing capacitor (13) and applies the AC power to the load (4). A leakage current reduction device (2) outputs a compensation current (Ic) which compensates for the leakage current (Ia) leaked ...

HARR (HIGH EFFICIENCY AC TO DC REDUCING REGULATOR) CHARGER POWER SUPPLY

An AC to DC power supply includes a first node, a second node, a switch, a switch control circuit, and a capacitive circuit. The switch is electrically coupled between the first node and the second node. The switch is configured to receive AC power at the first node. a switch control circuit electrically coupled to the first node and the switch. The switch control circuit is configured to open and close the switch based upon a voltage of the AC power at the first node. The capacitive circuit is electrically coupled to the second node. The capacitive circuit is configured to store energy when the switch is closed and provide DC power when the switch is open.

MULTI-LEVEL HYSTERESIS VOLTAGE CONTROLLERS FOR VOLTAGE MODULATORS AND METHODS FOR CONTROL THEREOF

Systems and methods that facilitate multilevel hysteresis voltage control methods for cascaded multilevel voltage modulators having a plurality of power cells connected in series and has any positive integer number of output voltage levels to control any unipolar voltage on the load of the voltage modulator, and transfer electrical power from an electrical grid via AC/DC converters or directly from energy storage elements of the power cells to that load. A method of operational rotation of the power cells of a multilevel voltage modulator, which ensures an equal power sharing among the power cells and voltage balancing of the energy storage elements of the power cells of the modulator.

APPARATUS AND METHOD FOR DYNAMICALLY STABILIZING CURRENT LIMITING IN A PORTABLE COMMUNICATION DEVICE

A battery operated portable communication device is provided with improved transmitter current limit stabilization via a current limit stabilization circuit operatively coupled to the battery and a DC-to-DC converter of the transmitter. The current limit stabilization circuit provides a variable stabilizing reference voltage which is directly proportional to the supply voltage. The current limit stabilization circuit generates a voltage limit output voltage that controls both the power to the transmitter (120) and limits current to the transmitter.

METHOD OF CONTROLLING THE SWITCHING OF A MULTILEVEL CONVERTER, A CONTROLLER FOR A MULTILEVEL CONVERTER, AND A COMPUTER PROGRAM FOR CONTROLLING A CONVERTER

A method of controlling a multilevel converter, a computer program and a controller for a converter is provided. The method includes determining a transition voltage (vstep) from a control period (k) to a following control period (k+1), analyzing (104) the switching cells (SC1, SC2, SC3, SCn) of each phase leg, selecting (111) capacitors to provide the transition voltage and synthesize the output voltage for the following control period (k+1), and connecting (113) the selected capacitors during the following control period (k+1). Especially, the analyzing (104) of each switching cell (SC1; SC2; SC3; SCn) comprises analyzing (104) a first switching leg (SL1) and a second switching leg (SL1) of the switching cell (SC1; SC2; SC3; SCn), and the method includes determining (105) whether a change of state of the first switching leg (SL1) would contribute to the direction of the transition voltage, and determining (105) whether a change of state of the second switching leg (SL2) would contribute ...

GATE DRIVE CIRCUIT TO REDUCE PARASITIC COUPLING

Provided is drive circuit including a first transformer unit in connection with a pulse amplifier module and a second transformer unit in connection with a plurality of power semiconductor groups, each group containing one or more power devices. The first transformer unit includes at least one primary transformer configured to receive a current pulse at a primary winding from a current pulse generation module, the current pulse being reflected to a secondary winding. The second transformer unit includes a plurality of secondary transformers where each secondary transformer is configured to receive the current pulse at a primary winding thereof, the current pulse being reflected to a secondary winding coupled to a pulse receiver module. The first and second transformer units reduce parasitic coupling between the pulse receiver module and the control module.

POWER SUPPLY

There is provided a switching power supply having low loss. In a power supply of the present invention, two sub switching elements connected in series are then connected in parallel with a bridge circuit, and a resonance coil and a sub primary winding are connected between a connection point of the series connection circuits and an output terminal of the bridge circuit. Resonance capacitors are respectively connected in parallel with each main switching element constituting the bridge circuit, so as to resonate with the resonance coil. Voltages across the two ends of A phase and B phase sub secondary windings magnetically coupled to the sub primary winding are clamped to the supply voltage, a fixed voltage in proportion to the turns ratio is generated in the sub primary winding, a voltage applied to the resonance coil becomes small and current fluctuation becomes small. Also, with the power supply of the present invention, two sub switching elements connected in series are then connected ...

DC ENERGY FLOW DIRECTION CONTROL USING REVERSE BLOCKING DEVICES IN DC-AC INVERTERS

A DC-AC inverter is defined as an electrical instrument to convert a DC (direct current) source to an AC (alternating current) output. In such an instrument, the electric energy can flow from the DC source to the AC output, or from the AC output to the DC source. But the latter energy-flow direction is not the intentional design direction for the inverter. This phenomenon exists when the voltage level at the DC source is lower than the voltage level at the AC output, for example, when the inverter is used in the wind energy conversion systems at low wind conditions, or when the inverter is used in the photovoltaic solar energy conversion systems at cloudy time. In such systems, the AC output is connected to the electric power lines, or the electric grid as the technical term used by electric utilities. The energy-flow from the AC to the DC can cause substantial reactive power, usually in lagging form, interference with the electric power delivery, increasing energy losses and reducing the ...

Rectifier controlling method and system thereof

Power converters and primary controllers

Various embodiments of apparatuses and systems for controlling the operating status of a power converter during, a standby mode, a powered mode, and a transition from the standby mode to the powered mode is described. For at least one embodiment, a power converter includes a primary controller and a secondary controller wherein the primary controller includes a first circuit configured to initiate a transition from standby mode to powered mode upon receipt of a wake-up signal and wherein the first circuit is powered during standby mode. For at least one embodiment, the first circuit is powered during a transition from a standby mode to a powered mode by voltages induced in a third coil of a transformer by a device battery powering a second coil of the transformer. For one embodiment, an IMIN controller is utilized to control output currents during transitions from standby to powered mode.

Tapped single-stage buck converter LED driver

An apparatus is disclosed, comprising: a first light source having a first threshold voltage; a second light source having a second threshold voltage; a rectifier configured to receive an AC voltage as input and generate a DC voltage based on the AC voltage; a single-stage Buck converter section coupled to the rectifier, the first light source, and the second light source, the Buck converter section being configured to output a current generated based on the DC voltage towards the first light source and the second light source; and a switching circuit configured to reduce a load on the Buck converter section by periodically diverting the current away from the second light source when a magnitude of the AC voltage is less than or equal to a sum of the first threshold voltage and the second threshold voltage.

METHOD OF REDUCING LINE LOSS OF POWER SUPPLY SYSTEM AND POWER SUPPLY SYSTEM WITH LINE LOSS REDUCTION

A power supply system with line loss reduction supplies power to a load through a power line. The power supply system includes a step-up converter, a detection circuit, and a control unit. The control unit sets a terminal voltage required by the load, controls an output voltage of the step-up converter to be terminal voltage, and acquires an output current corresponding to the terminal voltage to be a present current by the detection circuit. The control unit controls the output voltage to be a modulated voltage, and acquires an output current corresponding to the modulated voltage to be a modulated current by the detection circuit. The control unit adjusts the output voltage to be a first predetermined voltage according to the terminal voltage, the present current, the modulated voltage, and the modulated current.

Controller device for resonant mode power converter circuit

In some examples, a controller device for a resonant mode power converter circuit comprises a feed-forward pin configured to receive an input voltage signal of the resonant mode power converter circuit, a feedback pin configured to receive an output voltage signal of the resonant mode power converter circuit, processing circuitry configured to determine a switching frequency based on the input voltage signal and the output voltage signal, a first control pin configured to deliver a first control signal to the first switch at the switching frequency, and a second control pin configured to deliver a second control signal the second switch at the switching frequency.

Power control by direct drive

A power control circuit comprising a power supply and a load, the load being synthesized from an impedance synthesizer comprising two-terminal impedance elements connected in series and grouped in impedance modules. The impedance elements in each impedance module are of equal value, while those between the modules bear ratios uniquely defined according to the numbers of impedance elements in the impedance modules. A number of switches associated with said impedance elements short out a selected number of the impedance elements under the control of a first analog signal which may be preprocessed by an analytic function. The analog signal is converted to digital signals by an analog-to-digital converter, then level shifted to control the switches associated with the impedance elements, whereby the amount of power delivered to the load is controllable by the first analog signal. Pulse-width-modulation is deployed to further control the power by a second analog signal, with additional benefit ...

MULTI-LEVEL INVERTER

Various examples are directed to systems and methods for a multi-level inverter to convert direct current (DC) to alternating current (AC). The inverter may comprise first, second and third capacitors electrically coupled in series between a positive DC rail and a negative DC rail. A first pole switch bank of the inverter may comprise a plurality of first pole switches. A first pole may be electrically coupled to the first pole switch bank. A control circuit may comprise at least one processor that is programmed to alternately switch the first pole switch bank to a first state of the first pole switch bank in which the first pole is electrically coupled to the positive DC rail, a second state of the first pole switch bank in which the first pole is electrically coupled between the first capacitor and the second capacitor, a third state of the first pole switch bank in which the first pole is electrically coupled between the second capacitor and the third capacitor, a fourth state of the ...

Power converter

A synchronization detection PLL section generates an ON synchronized signal formed as a result of synchronization control based on a diode ON synthesized signal. The synchronization detection PLL section also generates an OFF synchronized signal formed as a result of synchronization control based on a diode OFF synthesized signal. A stator gate instruction generator PWM section generates a gate instruction signal for controlling the switching of a switching element on the basis of the ON synchronized signal and the OFF synchronized signal.

A MULTI-LEVEL POWER CONVERTER AND A METHOD FOR CONTROLLING A MULTI-LEVEL POWER CONVERTER

A multi-level power converter includes switching cells, each comprising switching devices and an energy storage element. The switching cells include switching cells of a first type and switching cells of a second type. The converter includes, for each phase, a first arm of serial connected switching cells and a second arm of serial connected switching cells, which first arm and second arm are connected in parallel. The first arm includes more switching cells of the first type than switching cells of the second type and the second arm includes more switching cells of the second type than switching cells of the first type. The switching cells of the first type have lower conduction loss than the switching cells of the second type. The converter is arranged so that a larger current flows through the first arm than the second arm.

Gate-controlled rectifier and application to rectification circuits thereof

Conventional diode rectifiers usually suffer from a higher conduction loss. The present invention discloses a gate-controlled rectifier, which comprises a line voltage polarity detection circuit, a constant voltage source, a driving circuit and a gate-controlled transistor. The line voltage polarity detection circuit detects the polarity of the line voltage and controls the driving circuit to turn on or turn off the gate-controlled transistor. The gate-controlled transistor may be a Metal Oxide Semiconductor Field Effect Transistor (MOSFET) with a gate, a source and a drain or an Insulated Gate Bipolar Transistor (IGBT) with a gate, an emitter and a collector. The constant voltage source is provided or induced by external circuits and referred to the source of the MOSFET or the emitter of the IGBT. Thanks to a lower conduction loss, this gate-controlled rectifier can be applied to rectification circuits to increase the rectification efficiency.

RELATIVE EFFICIENCY MEASUREMENT IN A PULSE WIDTH MODULATION SYSTEM

A pulse width modulation (PWM) power conversion system has improved efficiency over a wide operating input voltage and load range. Being able to measure relative efficiency of an analog PWM system allows enhanced control while maintaining the benefits of analog control. An analog low pass filter produces an average value of the PWM pulse train, then this analog average value is converted into digital values with an analog-to-digital converter and stored so that relative efficiencies of the PWM power conversion system may be compared for various combinations of operating parameters.

AC-AC converter with reduced inductive loss and switching loss

An AC-AC converter includes a first semiconductor switch series circuit, a second semiconductor switch series circuit, and a capacitor series circuit are connected in parallel. A first inductor is connected between one end of an alternating current input and a series connection point of the first semiconductor switch series circuit. A bidirectional switch is connected between the one end of the alternating current input and a series connection point of the second semiconductor switch series circuit. A second inductor is connected between the series connection point of the second semiconductor switch series circuit and one end of an alternating current output. A series connection point of the capacitor series circuit is connected to the other end of the alternating current input and the other end of the alternating current output.

DC-to-AC power converter with high efficiency

A DC-to-AC power converter (1) includes: a current-type DC-to-AC converter (70) having a first DC input (80) and a first AC output (85), said first DC input (80) being connected in parallel to said main DC input (10) and said first AC output (85) being connected in parallel to said main AC output (20); and a controller (110) for: controlling said bidirectional voltage-type DC-to-AC converter (50) for delivering at said first AC output-input (65) a sinusoidal AC voltage of said fundamental frequency f0; controlling said current-type DC-to-AC converter (70) for delivering at said first AC output (85) a quasi square-type AC current of said fundamental frequency ID and in phase with said sinusoidal AC voltage; imposing that at least 70% of said rated current is provided by said current-type DC-to-AC converter (70).

Duty cycle estimation

A duty cycle estimator for determining a nominal duty cycle of an output regulator. The duty cycle estimator having at least two modes and including at least a mode one estimator and a mode two estimator. The mode one estimator to determine the nominal duty cycle as a function of prior duty cycles. The mode two estimator to determine the nominal duty cycle as a function of accumulated error. A mode selector, based on a mode selection criteria, to select a one of the at least two modes to generate the nominal duty cycle.

PWM half-bridge converter with dual-equally adjustable control signal dead-time

A method and system of controlling half-bridge DC-DC converters to achieve Zero Voltage Switching (ZVS) for at least one of the switches. The soft-switching half-bridge DC-DC converter system includes soft-switching for all switches by adding an additional branch with a switch and a diode across the primary side of an isolation transformer and by applying a Duty-Cycle Shifted PWM Control.

Capacitor

A device including a first electrical conductor, a second electrical conductor, dielectric material connecting the first and second conductors to each other, and an output or ground terminal section. The first electrical conductor has a first terminal section and a first plate section. The second electrical conductor includes a second terminal section and a second plate section. The second terminal section is connected to a first end of the second plate section. The second plate section includes a coil shaped section. The output terminal section is connected to an opposite second end of the second plate section. The dielectric material connects the first and second plate sections to each other.

Switching-mode power supply circuit

A switching-mode power supply circuit includes a boost inductor, a boost capacitor, a storage capacitor, a transformer or DC-DC inductor, a first switching component, an output rectification component, a filter capacitor, a feedback and control circuit, first and second rectification circuits. When first switching component conducts, the boost inductor, boost capacitor and first switching component form a first boost loop, the boost inductor stores energy, and the storage capacitor, first switching component and transformer or DC-DC inductor form a first DC-DC loop. When first switching component cuts off, the boost inductor, boost capacitor, storage capacitor and transformer or DC-DC inductor form a second boost loop, and the transformer or DC-DC inductor, output rectification component and filter capacitor form a second DC-DC loop. The filter capacitor supplies energy to a load. The feedback and control circuit drives the first switching component to turn on/off according to a chopping ...

System and Method for Thermal Protection in a Power System

In accordance with embodiments of the present disclosure, systems and methods for thermal protection in a power system may be provided. In accordance with certain embodiments of the present disclosure, a method for thermal protection in a power system having a plurality of power modules selectively enabled and disabled in accordance with an efficiency policy may be provided. The method may include determining if an operating temperature for the power system is greater than a first threshold temperature. The method may also include enabling one or more power modules disabled in accordance with the efficiency policy in response to a determination that the operating temperature is greater than the first threshold temperature.

3-level pulse width modulation inverter with snubber circuit

The present invention relates to a circuit arrangement which comprises at least one 3-level pulse width modulation inverter with a snubber circuit. The snubber circuit is formed by at least one coil (L), two capacitors (Cu, Co) and a series connection comprising four diodes (Dh 1 -Dh 4 ) poled in the same direction, whereof the two outer diodes (Dh 1 , Dh 4 ) are in each case directly connected to the input terminals ( 1, 3 ) for the positive and the negative pole of the input voltage. The electrical connection between the two inner diodes (Dh 2 , Dh 3 ) is connected on the one hand via the coil (L) to the input terminal ( 2 ) for the centre tap of the input voltage and on the other hand to the middle bridge branch of the pulse width modulation inverter. In one embodiment, the two capacitors (Cu, Co) are in each case connected with one terminal to the electrical connection between one of the inner diodes (Dh 2 , Dh 3 ) and one of the outer diodes (Dh 1 , Dh 4 ) and with the other terminal directly to the output terminal ( 4 ). With the proposed circuit, switching losses are completely avoided as a matter of principle with a simple and low-cost design.

Switching power supply circuit

A reactor, a diode, and a switching element connected to a path constitute a booster circuit, and another reactor, another diode, and another switching element connected to another path constitute another booster circuit. The booster circuits also function as a power factor correction circuit for correcting a power factor of the input side. Swing chokes are adopted as the reactors.

Power supply system, image forming apparatus having the same, and low-capacity power supply circuit

A power supply system comprises: a switching power supply for generating a DC voltage by rectifying and smoothing an AC voltage of an AC power supply; a control device switching the switching power supply between the normal mode and a power saving mode; and a low-capacity power supply circuit supplying electric power to the control device in the power saving mode. The low-capacity power supply circuit includes: two capacitors, each including one end connected to the AC power supply; a rectifier circuit that is electrically connected between the other ends of the capacitors, and rectifies the AC voltage applied between the first and second capacitors; and a zero-crossing detecting circuit that is connected to a current path at the rear stage of the rectifier circuit, and detects zero-crossing points of the AC power supply.

System and method for converter switching frequency control

A system for power conversion includes a power converter having switching elements, a detector, and a controller is provided. The detector detects a parameter and provides electrical signals indicative of the parameter. The controller receives the electrical signals transmitted from the detector, and sends commands to instruct the power converter to perform power conversion by operating the switching elements in accordance with switching signals at a different frequency in response to a detection of the system condition. A method for operating the system is also provided.

Power supply device and a synchronous rectifier pcb

A power supply device includes a main unit and a power switching module. The main unit includes a primary circuit board, a transformer including a primary and a secondary coil, a primary-side circuit and a secondary-side circuit. The power switching module includes a separate PCB formed with at least two connection pads and two conductive tracks, and at least one power switching element disposed on the PCB and having two terminals respectively connected to the two connection pads through the two conductive tracks. The power switching module is in the form of a separate PCB that is electrically connected to the primary- or secondary-side circuits through the two connection pads.

Electrical Control System

An electrical control system having a direct current to direct current regulator receiving a direct current supply input, wherein the regulator outputs a controlled voltage direct current inverter power feed. Included is an inverter in electrical communication with the regulator and receives the controlled voltage direct current inverter power feed, the inverter outputs an alternating current motor power feed to a permanent magnet brushless direct current motor that outputs a shaft rotational speed and a back electromotive force. Also, a control is provided for regulating the controlled voltage direct current inverter power feed based upon criteria utilizing the back electromotive force or an auxiliary motor stator wire loop signal in conjunction with an optional voltage look-up table to substantially make the controlled voltage result in a reduction of a pulse width modulation switching frequency to further smooth and reduce harmonic of the alternating current waveform to increase motor efficiency.

Power supply mode switching circuit and method

A power supply mode switching circuit and method switch between power supply modes of a power supply device dynamically based on an operating current required for operation of an electronic product, such that the power supply device supplies a supplying current corresponding to the operating current. The circuit comprises a sampling unit, an amplifying unit, a comparing unit. The circuit is disposed between the power supply device and the electronic product, samples the supplying current from the power supply device with the sampling unit, and converts the supplying current into a sampling voltage. The amplifying unit converts the sampling voltage into an amplifying voltage by voltage amplification and outputs the amplifying voltage to the comparing unit. After comparing the voltage level of a reference voltage and that of the amplifying voltage, the comparing unit generates a control signal for switching the power supple modes of the power supply device.

Power Converters And Methods For Active Leakage Energy Recovery In A Power Converter

Power converters and methods of recovering leakage energy in power converters are disclosed. In one embodiment, a power converter assembly includes an input for receiving a direct current (DC) power input, a flyback converter coupled to the input, and a leakage energy recovery circuit coupled to the flyback converter. The flyback converter includes a transformer having a plurality of windings. The leakage energy recovery circuit is configured to couple leakage energy from the transformer to the input in response to a voltage across at least one of the plurality of windings

Power Management

A system includes a power supply system, a power management system, and a module. The module communicates to the power management system a variable parameter indicating power usage by the module and the power management system changes an operating range of the power supply system in response to the communication from the module.

POWER CONVERSION MODULE

A power conversion module includes a high-voltage side, a low-voltage side, a magnetic element, a high-voltage side circuit, and a low-voltage side circuit. The first end includes a high-voltage positive terminal and a high-voltage negative terminal. The second end includes a low-voltage positive terminal and a low-voltage negative terminal. The magnetic element includes two first windings. The high-voltage side circuit is electrically connected with the high-voltage positive terminal and the high-voltage negative terminal. The low-voltage side circuit is electrically connected with the low-voltage positive terminal and the low-voltage negative terminal. At least one AC loop includes at least one of the first windings, at least one part of the high-voltage side circuit and the low-voltage side circuit. The high-voltage side circuit and the low-voltage side circuit are located at a same side with respect to the magnetic element. 1. A power conversion module , comprising:a first end comprising a high-voltage positive terminal and a high-voltage negative terminal;a second end comprising a low-voltage positive terminal and a low-voltage negative terminal, wherein the low-voltage negative terminal is electrically connected with the high-voltage negative terminal;a magnetic element comprising two first windings;a high-voltage side circuit electrically connected with the high-voltage positive terminal and the high-voltage negative terminal, and electrically connected with the two first windings of the magnetic element; anda low-voltage side circuit electrically connected with the low-voltage positive terminal and the low-voltage negative terminal, and electrically connected with the two first windings of the magnetic element,wherein the power conversion module comprises at least one alternating current (AC) loop defined by at least one of the first windings, at least one part of the high-voltage side circuit, and at least one part of the low-voltage side circuit, wherein ...

VOLTAGE SWITCHING CIRCUIT AND POWER ADAPTER

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

Power supply apparatus and image forming apparatus

The power supply apparatus includes a control unit that can perform intermittent operation of alternately repeating a switching period and a switching halt period, wherein the switching period is for performing switching operation of alternately turning on or turning off two switching elements across a turn-off period for turning off both of the two switching elements, and the switching halt period is for halting the switching operation. In a transition from the switching period to the switching halt period, the control unit makes the transition to the switching halt period after turning on a second switching element. In a transition from the switching halt period to the switching period, the control unit also makes the transition to the switching period after turning on the second switching element.

Power conversion device

Power conversion device for supplying a load with a PWM signal, comprising an inductive filter having at least an output configured to be connected to the load, the device comprising: a power conversion module supplied by an input voltage and configured for providing a plurality of output signals wherein one of the plurality of output signals is supplied to the filter; a conversion ratio control stage coupled to the power conversion module; and a controller configured to: determine a requested conversion ratio based on the input voltage and a target reference voltage; and based on the requested conversion ratio, control the conversion ratio control stage to operate in either a first operating mode, whereby the power conversion module provides the output signals in accordance with a first conversion ratio, or a second operating mode, whereby the power conversion module provides the output signals in accordance with a second conversion ratio.

Multi-phase converter

Disclosed is a multi-phase converter comprising a plurality of electric phases, each of which can be triggered by a switching means. At least one coupling means ( 100 to 106 ) is provided for coupling a phase to another phase, each phase having two windings.

HIGH EFFICIENCY, PARALLEL, POWER CONVERSION SYSTEM WITH ADAPTIVE DYNAMIC EFFICIENCY OPTIMIZATION

A system for controlling a plurality of power converters in a power system so as to turn each of the plurality of power converters into an ON state or an OFF state as a function of a sensed input power and a sensed output power such that one or more of the plurality of power converters in the ON state are operating in an optimal power efficiency range. 1. A system for controlling a plurality of power converters in a power system for supplying power to a load , comprisinga plurality of switched capacitor type power converters forming an array for converting power between a first power level and a second power level when operating, wherein the plurality of switched capacitor type power converters are arranged in parallel relative to each other and wherein each of the switched capacitor type power converters has a plurality of capacitors for storing power,an input power line coupled to an input of each of the plurality of switched capacitor type power converters on an input side for providing input power at the first power level,an output power line coupled to an output of each of the plurality of switched capacitor type power converters on an output side for providing output power to a the load at the second power level,a controller coupled to the outputs of the plurality of switched capacitor type power converters for controlling a power output of the plurality of power converters,an input sensing circuit coupled to the input power line and to the controller for sensing the input power on the input power line and transmitting an input power signal to the controller, andan output sensing circuit coupled to the output power line and to the controller for sensing the output power on the output power line and transmitting an output power signal to the controller, an ON state at a first clock frequency so as to supply power to the load, and', 'an OFF state at a second lower clock frequency where the power converter does not transmit power to the load and remains operative ...

Integrated dc-dc boost converter with gallium nitride power transistor

Integrated circuits, wafer level integrated III-V power device and CMOS driver device packages, and methods for fabricating products with integrated III-V power devices and silicon-based driver devices are provided. In an embodiment, a boost converter circuit includes an inductor; a power switch having a conducting state and blocking state; and a control circuit for controlling the power switch from the conducting state to the blocking state for controlling flow of the current in the inductor, wherein the control circuit comprises a silicon integrated circuit comprising bipolar CMOS transistors, wherein when the power switch comprises a first GaN transistor, and wherein the power switch and silicon integrated circuit are electrically and mechanically coupled by way of flip chip bonding.

Serial-parallel switch negative charge pump

A negative charge pump includes a network of two or more capacitors, and switches and adapted to switch the capacitor network between a serial configuration, in which the capacitors are connected to each other in series, and a parallel configuration, in which the capacitors are connected to each other in parallel. The negative charge pump has an input adapted to receive an input signal having intermittent high- and low levels, and an output. The switches are adapted to switch the capacitor network into the serial configuration when the input signal is high and switch the switch the capacitor network into the parallel configuration when the input signal is low (e.g., zero or ground level). A method of converting a positive voltage to a negative voltage includes applying an input signal having intermittent high- (e.g., positive-) and low (e.g., zero or ground) levels to a capacitor network having two or more capacitors; configuring the network into a serial configuration, in which the capacitors are connected to each other in series; charging the capacitors connected in series with the input signal during a pre-charge period, during which the input signal level is high; subsequently, during a pump period, during which the input signal level is low, configuring the network into a parallel configuration, in which the capacitors are connected to each other in parallel; and discharging the capacitors connected in parallel to an output.

Coupling device for a multi-phase converter

The invention relates to a coupling device ( 4 ) for four phases of a multi-phase converter ( 2 ). Said coupling device ( 4 ) includes four coupling modules ( 6, 8, 12, 14 ), each of which encompasses four parallel through-holes. At least one section of a conductor loop ( 18, 20, 22, 24 ) for a phase. At least one section of a conductor loop ( 18, 20, 22, 24 ) for a phase penetrates a through-hole of a coupling module ( 6, 8, 12, 14 ), sections of conductor loops ( 18, 20, 22, 24 ) for at least two phases penetrating all four through-holes of a coupling module ( 6, 8, 12, 14 ).

Low forward voltage rectifier

A Low Forward Voltage Rectifier (LFVR) includes a bipolar transistor, a parallel diode, and a base current injection circuit disposed in an easy-to-employ two-terminal package. In one example, the transistor is a Reverse Bipolar Junction Transistor (RBJT), the diode is a distributed diode, and the base current injection circuit is a current transformer. Under forward bias conditions (when the voltage from the first package terminal to the second package terminal is positive), the LFVR conducts current at a rated current level with a low forward voltage drop (for example, approximately 0.1 volts). In reverse bias conditions, the LFVR blocks current flow. Using the LFVR in place of a conventional silicon diode rectifier in the secondary of a flyback converter reduces average power dissipation and increases power supply efficiency.

Charging system, charging method, and power adapter

The present disclosure discloses a charging system, a charging method and a power adapter. The system includes a power adapter and a terminal. The power adapter includes a first rectifier, a switch unit, a transformer, a second rectifier, a sampling unit, a control unit and a first isolation unit. The control unit outputs a control signal to the switch unit, and adjusts a duty ratio of the control signal according to a current value and/or voltage value sampled by the sampling unit, such that a third voltage with a third ripple waveform outputted by the second rectifier meets a charging requirement. The terminal includes a battery. When the terminal is coupled to the power adapter, the third voltage is applied to the battery.

Flyback power converters including adaptive clamp circuits for adjusting resonant frequencies

A switch mode power supply includes a flyback power converter and a control circuit. The flyback power converter includes an input, an output, a transformer coupled between the input and the output, a power switch coupled between the input and the transformer, and a clamp circuit coupled between the input and the transformer. The clamp circuit includes a capacitor and a clamp switch coupled in series with the capacitor. The control circuit is configured to control the power switch and the clamp switch. The switch mode power supply further includes at least one additional capacitor coupled in parallel with the capacitor of the clamp circuit to facilitate selection of a combination of capacitors to adjust a resonant frequency of the clamp switch for optimizing efficiency of the power supply. Other examples switch mode power supplies and/or methods for adjusting a resonant frequency of flyback power converters are also disclosed.

Spatially variable wafer bias power system

A plasma deposition system comprising a wafer platform, a second electrode, a first electrode, a first high voltage pulser, and a second high voltage pulser. In some embodiments, the second electrode may be disposed proximate with the wafer platform. In some embodiments, the second electrode can include a disc shape with a central aperture; a central axis, an aperture diameter, and an outer diameter. In some embodiments, the first electrode may be disposed proximate with the wafer platform and within the central aperture of the second electrode. In some embodiments, the first electrode can include a disc shape, a central axis, and an outer diameter. In some embodiments, the first high voltage pulser can be electrically coupled with the first electrode. In some embodiments, the second high voltage pulser can be electrically coupled with the second electrode.

Power converter

The present invention concerns a power converter including a primary stage including at least one first cut-off switch; a control circuit capable of applying a first control signal to said at least one first switch; a secondary stage including at least one second cut-off switch; a control circuit capable of applying a second control signal to said at least one second switch; and a power transmission stage coupling the primary stage to the secondary stage, wherein the control circuit of the secondary stage is electrically isolated from the control circuit of the primary stage.

Power supply source for an electric heating system

The invention relates to power engineering, in particular to electric heating systems for residential and other buildings. The power supply source for an electric heating system comprises an inductance coil ( 1 ), which is connected to a load circuit ( 4 ) and is connected to a primary source ( 3 ) of electrical energy with the possibility of periodic connection of one of the ends of said coil ( 9 ) to one of the terminals of the primary source ( 3 ) of electrical energy via an electronic switch ( 6 ), and a generator ( 8 ) of unipolarity pulses, the output of which is connected to the input of the electronic switch ( 6 ). According to the invention, the second end ( 10 ) of the inductance coil ( 1 ) is connected to the second terminal of the primary source ( 3 ) of electrical energy via a second electronic switch ( 7 ), the input of which is connected to the output of said generator ( 8 ) of pulses of single polarity so as Co ensure synchronized operation of said electronic switches ( 6, 7 ). The result which can be achieved consists in increasing the energy conversion ratio.

Converter

A converter having an inductor, a first switch, a second switch, a third switch, and a fourth switch connected between the other ends of the inductor and the second switch. The converter is adapted to turn ON/OFF individually the first switch, the second switch, the third switch and the fourth switch so as to convert a voltage applied between the other ends of the first switch and the second switch. Also included is a diode, a maintaining device and a release device. The generating device generates small/large output electric current in correspondence with high/low of a voltage of a connection node between the semiconductor transistor and the resistor, and increases the output electric current by switching a voltage applied on the third end from a first voltage to a second voltage lower than the first voltage.

DC-TO-DC CONVERTER

A bidirectional or unidirectional DC-DC converter includes a primary stage and a secondary stage. The primary stage is configured to receive or output a first DC voltage. The primary stage includes a first switching network configured to convert the first DC voltage to a first alternating current (AC) voltage or vice versa. The DC-DC converter also includes a transformer having primary windings and secondary windings. The primary windings are in electrical communication with the first switching network. The transformer is configured to convert between the first AC voltage and a second AC voltage. The DC-DC converter also includes a secondary stage that has a second switching network. Characteristically, the second switching network and the transformer operate as an interleaved converter to convert the second AC voltage to an output DC voltage or vice versa. Advantageously, the required series inductance for this interleaved converter is integrated into the transformer. 1. A bidirectional or unidirectional DC-DC converter that applies a dual active bridge rectifier topology that converts an input DC voltage to an output DC voltage , the bidirectional or unidirectional DC-DC converter comprising:a first switching network that receives or outputs a first DC voltage and a first AC voltage, the first switching network configured to receive the first DC voltage and to convert the first DC voltage to the first AC voltage or to convert the first AC voltage to the first DC voltage and to output the first DC voltage and;a second switching network in electrical communication with a secondary side voltage bus; anda transformer having primary windings and secondary windings, the transformer configured to receive the first AC voltage and output a second AC voltage or to receive the second AC voltage and output the first AC voltage, the secondary windings having a first end terminal a second end terminal, and an output terminal positioned between the first end terminal and the ...

Dc/dc resonant converters and power factor correction using resonant converters, and corresponding control methods

Various improvements are provided to resonant DC/DC and AC/DC converter circuit. The improvements are of particular interest for LLC circuits. Some examples relate to self-oscillating circuit and others relate to converter circuits with frequency control, for example for power factor correction, driven by an oscillator.

Switched-mode power supply

An electronic device includes a switched-mode power supply having a first operating phase during which the output node of the switched-mode power supply is coupled by an on switch to a source of a first reference voltage. The first operating phase is followed by a second operation phase during which the output node of the switched-mode power supply is in a high impedance state. While in the second operating phase, a capacitor connected to the output node of the switched-mode power supply at least partially discharges into a load.

Configurable-speed multi-phase dc/dc switching converter with hysteresis-less phase shedding and inductor bypass

Some embodiments provide a multi-phase DC/DC switching converter in which each of the phases are controlled using a common comparator for comparing an output voltage of the switching converter and a reference voltage, with in some embodiments each of the phases including a bypass switch for coupling ends of an output inductor of the switching converter. Some embodiments provide a multi-phase DC/DC switching converter in which some of the phases are operated with clock signals having frequencies different than clock signals used for operating others of the phases. Some embodiments provide a multi-phase DC/DC switching converter in which some of the phases include inductors having inductances different than inductances for inductors of others of the phases.

Charging system and method, and power adapter

The present disclosure discloses a charging system and method, and a power adapter. The system includes a power adapter and a terminal. The power adapter includes a first rectifier, a switch unit, a transformer, a compositing unit, a sampling unit, and a control unit. The control unit outputs a control signal to the switch unit, and adjusts a duty ratio of the control signal according to a current sampling value and/or a voltage sampling value, such that a second alternating current outputted by the compositing unit meets a charging requirement. The terminal includes a battery.

Charging system and charging method, and power adapter

The present disclosure discloses a charging system, a charging method and a power adapter. The system includes a battery, a first rectifier, a switch unit, a transformer, a compositing unit, a sampling unit, and a control unit. The control unit outputs a control signal to the switch unit, and adjusts a duty ratio of the control signal according to a voltage sampling value and/or a current sampling value obtained by primary sampling of the sampling unit, such that a second alternating current outputted by the compositing unit meets a charging requirement. The second alternating current is applied to the battery.

HIGH EFFICIENCY, PARALLEL, POWER CONVERSION SYSTEM WITH ADAPTIVE DYNAMIC EFFICIENCY OPTIMIZATION

A system for controlling a plurality of power converters in a power system so as to turn each of the plurality of power converters into an ON state or an OFF state as a function of a sensed input power and a sensed output power such that one or more of the plurality of power converters in the ON state are operating in an optimal power efficiency range. 1. A system for controlling a plurality of power converters in a power system for supplying power to a load , comprisinga plurality of switched capacitor type power converters forming an array for converting power between a first power level and a second power level when operating, wherein the plurality of switched capacitor type power converters are arranged in parallel relative to each other and wherein each of the switched capacitor type power converters has a plurality of capacitors for storing power,an input power line coupled to an input of each of the plurality of power converters on an input side for providing input power at the first power level,an output power line coupled to an output of each of the plurality of power converters on an output side for providing output power to a the load at the second power level,a controller coupled to the outputs of the plurality of power converters for controlling a power output of the plurality of power converters,an input sensing circuit coupled to the input power line and to the controller for sensing the input power on the input power line and transmitting an input power signal to the controller, andan output sensing circuit coupled to the output power line and to the controller for sensing the output power on the output power line and transmitting an output power signal to the controller, an ON state at a first clock frequency so as to supply power to the load, and', 'an OFF state at a second lower clock frequency where the power converter does not transmit power to the load and remains operative so as to charge the plurality of capacitors associated therewith,, ' ...

VOLTAGE REGULATOR MODULE

A voltage regulator module is provided. The switch circuit assembly includes two switch circuits and an input capacitor. Respective input terminals of the two switch circuits are connected with each other in parallel. The input capacitor is electrically connected with the respective input terminals of the two switch circuits in parallel and disposed between the two switch circuits. The plurality of conductive members have a first conductive member, a second conductive member and a third conductive member. The first conductive member and the third conductive member are configured to deliver an electric energy. The second conductive member is configured to deliver a signal. One end of each conductive member is electrically connected with corresponding switch circuit, and the other end of the first conductive member and the third conductive member is electrically connected with the load. The switch circuit assembly and the magnetic assembly are stacked with each other. 1. A voltage regulator module for powering a load , comprising: two switch circuits, wherein respective input terminals of the two switch circuits are connected with each other in parallel; and', 'an input capacitor, wherein the input capacitor is electrically connected with the respective input terminals of the two switch circuits in parallel and disposed between the two switch circuits; and, 'a switch circuit assembly, comprising a core assembly; and', 'a plurality of conductive members, wherein the plurality of conductive members have at least one first conductive member, at least one second conductive member and at least one third conductive member, and the at least one first conductive member and the at least one third conductive member are configured to deliver an electric energy, and the at least one second conductive member is configured to deliver a signal, one end of each of the plurality of conductive members is electrically connected with corresponding one of the two switch circuits, and the ...

Electric power conversion circuit

An electric power conversion circuit comprises U-phase and V-phase switching circuits, a transformer, and an α-phase switching circuit. A primary winding of a transformer is connected between the U-phase switching circuit and the V-phase switching circuit, and both ends of a secondary winding are connected to the α-phase switching circuit. The α-phase switching circuit comprises positive and negative terminals, a half bridge including and two switching devices, and a voltage divider circuit. The half bridge is provided between the positive terminal and the negative terminal, and a common connection point between the two switching devices is connected to one end of the secondary winding. A voltage divider output point of the voltage divider circuit is connected to the other end of the secondary winding.

Power source system

The step-up converter includes the plurality of converting units, each having the reactor and the semiconductor element part having electronic parts such as the transistor and the diodes. The ECU performs changeover control of increase or decrease of the number of drive phases of the converting units, based on the output condition from the fuel cell, the temperature condition of the reactor, and the temperature condition of the semiconductor element part.

Half bridge power conversion circuits using gan devices

GaN-based half bridge power conversion circuits employ control, support and logic functions that are monolithically integrated on the same devices as the power transistors. In some embodiments a low side GaN device communicates through one or more level shift circuits with a high side GaN device. Both the high side and the low side devices may have one or more integrated control, support and logic functions. Some devices employ electro-static discharge circuits and features formed within the GaN-based devices to improve the reliability and performance of the half bridge power conversion circuits.

Integrated bias supply, reference and bias current circuits for gan devices

GaN-based half bridge power conversion circuits employ control, support and logic functions that are monolithically integrated on the same devices as the power transistors. In some embodiments a low side GaN device communicates through one or more level shift circuits with a high side GaN device. Both the high side and the low side devices may have one or more integrated control, support and logic functions. Some devices employ electro-static discharge circuits and features formed within the GaN-based devices to improve the reliability and performance of the half bridge power conversion circuits.

Variable dc link converter and transformer for wide output voltage range applications

A variable direct current (DC) link power converter is described. In one example, the power converter includes a first converter stage configured to convert power from a power source to power at an intermediate link voltage and a second converter stage configured to convert the power at the intermediate link voltage to power for charging a battery. The power converter further includes a control system having an intermediate link voltage regulation control loop configured, in a first mode of operation, to regulate the intermediate link voltage through the first converter stage based on a voltage of the battery, and a ripple regulation control loop configured to sense a charging current for the battery and regulate a gain of the second converter stage based on the charging current to reduce ripple in the charging current. A new configuration of transformer suitable for use with the power converter is also described.

Power conversion apparatus including multiple dc-dc converters and method of controlling multiple dc-dc converters

A power conversion apparatus includes a plurality of converters which independently converts a voltage of power output from a power source, a measuring instrument which measures at least one predetermined characteristic value of power to be supplied from the power source to a load, and a controller for enabling or disabling each of the plurality of converters based on the at least one predetermined characteristic value.

Switching power converter with zero current at startup

A switching power converter is provided with a power-on-reset (POR) circuit that discharges essentially no current until a power supply voltage exceeds a POR threshold voltage.

Charging device, charging method, power adapter and terminal

The present disclosure discloses a charging device, a charging method, a power adapter and a terminal. The device includes: a charging receiving terminal configured to receive a first alternating current; a voltage adjusting circuit, including a first rectifier configured to rectify the first alternating current and output a first voltage with a first ripple waveform, a switch unit configured to modulate the first voltage according to a control signal to obtain a modulated first voltage, a transformer configured to output a plurality of voltages with ripple waveforms according to the modulated first voltage, and a compositing unit configured to composite the plurality of voltages to output a second alternating current; and a central control module configured to output the control signal to the switch unit so as to adjust voltage and/or current of the second alternating current in response to a charging requirement of the battery.

Power converter including a recirculating snubber

A power converter includes a first rectifier circuit having a pair of first rectifier circuit output terminals and a second rectifier circuit having a pair of second rectifier circuit output terminals, a snubber circuit comprising a first diode and a first capacitor connected to each other at a first node and connecting the pair of first rectifier circuit output terminals, a second diode and a second capacitor connected to each other at a second node and connecting the pair of second rectifier circuit output terminals, a third diode connecting the first node to one of the pair of second rectifier output terminals, and a fourth diode connecting the second node to one of the pair of first rectifier output terminals.

Harvesting Energy From Parasitic Elements Of A Power Converter

Power converter electronic circuitries configured to harvest and store energy from at least the parasitic oscillation occurring during the operation thereof. Methodologies of using such energy for the current injection, carried out by discharging the parasitic capacitance across the switching elements to achieve zero voltage switching condition for these switching elements. In a specific case, the methodology of current injection (with the use of so harvested and stored energy) is self-adjusting, causing the optimization of the energy required to discharge the parasitic capacitances.

Vehicle battery external loading device including an ac/dc converter having a resonant insulated stage

The invention relates to a device ( 2 ) for charging a motor-driven device battery ( 5 ). Said charging device ( 2 ) includes: a first conversion module ( 3 ); a second conversion module ( 4 ); and a means ( 6 ) for controlling the first conversion module ( 3 ). The first conversion module ( 3 ) is suitable for converting an input AC current into an intermediate current and supplying said intermediate current to the second conversion module ( 4 ). The second conversion module ( 4 ) is suitable for converting the intermediate current into an output current and supplying said output current to the battery ( 5 ). The intermediate current is direct current, and the output current is also direct current. The controlling means ( 6 ) is suitable for adjusting the voltage of the intermediate current on the basis of operating parameters of the second conversion module ( 3 ).

Standby Power

Various embodiments of apparatuses, systems, and methods for controlling the operating status of a power converter during, a standby mode, a powered mode, and a transition from the standby mode to the powered mode is described. For at least one embodiment, a power converter includes a primary controller and a secondary controller wherein the primary controller includes a first circuit configured to initiate a transition from standby mode to powered mode upon receipt of a wake-up signal and wherein the first circuit is powered during standby mode. For at least one embodiment, the first circuit is powered during a transition from a standby mode to a powered mode by voltages induced in a third coil of a transformer by a device battery powering a second coil of the transformer. For one embodiment, an IMIN controller is utilized to control output currents during transitions from standby to powered mode.

Power supply control device

There is provided a power supply control device as a control main entity of a switching power supply. The power supply control device includes a minimum ON width setting part configured to set a minimum ON width of an output switch according to a load.

AUTOMATIC FREQUENCY OSCILLATOR FOR PULSE-REGULATED SWITCH-MODE POWER SUPPLY

In some examples, a switch-mode power supply circuit comprises a pulse generation circuit comprising an oscillator, the oscillator configured to generate first pulses using a fixed frequency regulation for a first load condition that exceeds a predefined threshold and configured to generate second pulses using a variable frequency regulation for a second load condition that does not exceed the predefined threshold. The circuit also includes a power converter coupled to the pulse generation circuit and configured to convert a first voltage to a regulated voltage using either one of the first or second pulses generated by the pulse generation circuit. The circuit further comprises an output filter coupled to the power converter and configured to produce a second voltage from the regulated voltage. 1. (canceled)2. (canceled)3. (canceled)4. (canceled)5. (canceled)6. (canceled)7. (canceled)8. (canceled)9. A device , comprising:a current mirror having an input node and an output node;a first transistor having at least one terminal coupled to the input node of the current mirror;a capacitor having a first end coupled to the output node and a second end coupled to ground;a second transistor having a first control terminal coupled to a clock circuit, a second control terminal coupled to ground, and a non-control terminal coupled to the output node; anda buffer having a fixed threshold voltage, wherein an input of the buffer is coupled to the output node.10. The device of claim 9 , further comprising a resistor claim 9 , wherein a first end of the resistor is coupled to a second control terminal of the first transistor and a second end of the resistor is coupled to ground.11. The device of claim 10 , further comprising a current source claim 10 , wherein the current source is coupled to the input node.12. The device of claim 10 , further comprising a comparator claim 10 , wherein an output of the comparator is coupled to a first control terminal of the first transistor.13. A ...

Control circuit for a power supply

The invention relates to a control circuit ( 250 ) for a power supply unit ( 200 ) that has an input ( 207, 209 ) for receiving a mains supply ( 208 ), the control circuit ( 250 ) configured to: sample the input ( 207, 209 ) in order to obtain a first sample value; sample the input ( 207, 209 ) in order to obtain a second sample value subsequent to obtaining the first sample value; compare the first and second sample values to provide an outcome; set a delay interval in accordance with the outcome of the comparison of the first and second sample values; and sample the input ( 207, 209 ) in order to obtain a third sample value after the delay interval has elapsed.

Half bridge power conversion circuits using gan devices

GaN-based half bridge power conversion circuits employ control, support and logic functions that are monolithically integrated on the same devices as the power transistors. In some embodiments a low side GaN device communicates through one or more level shift circuits with a high side GaN device. Both the high side and the low side devices may have one or more integrated control, support and logic functions. Some devices employ electro-static discharge circuits and features formed within the GaN-based devices to improve the reliability and performance of the half bridge power conversion circuits.

METHOD FOR REDUCING THERMAL STRESS OF A POWER SEMICONDUCTOR SWITCH, AN ELECTRICAL CONVERTER UNIT AND AN ELEVATOR

An electrical converter unit and a method for reducing thermal stress of a power semiconductor switch, such as an IGBT, of an electrical converter unit, the electrical converter unit comprising at least a gate control circuit wherein the electrical converter unit controls an electrical motor. The method comprises determining load and estimating required motor current based on the determined load and/or a predetermined speed profile. The electrical converter unit has at least a first operating state and a second operating state. The second operating state is used if predetermined criteria is fulfilled, the predetermined criteria relating to at least one of the following: estimated required current, measured motor speed, temperature of the power semiconductor switch and/or electrical converter unit, temperature model of the power semiconductor switch and/or electrical converter unit. In the second operating state a lower switching frequency of the power semiconductor switch is used than in the first operating state, and in the second operating state a higher switching speed of the power semiconductor switch is used than in the first operating state. 1. A method for reducing thermal stress of a power semiconductor switch , such as an IGBT , of an electrical converter unit , the electrical converter unit comprising at least a gate control circuit wherein the electrical converter unit controls an electrical motor , wherein the method comprises:determining load.estimating required motor current based on the determined load and/or a predetermined speed profile,wherein the electrical converter unit has at least a first operating state and a second operating state,wherein the second operating state is used if predetermined criteria is fulfilled, the predetermined criteria relating to at least one of the following: estimated required current, measured motor speed, temperature of the power semiconductor switch and/or electrical converter unit, temperature model of the power ...

Damper and an electrical energy converting device using the same

A damper includes a resonant circuit, a damping capacitor unit and a switching circuit. A damping inductor unit of the resonant circuit receives alternating current (AC) electrical energy. A resonant capacitor of the resonant circuit is connected to the damping inductor unit. The switching circuit is connected to the resonant capacitor, the damping inductor unit, and the damping capacitor unit. The switching circuit establishes, when operating in a first phase, a connection between the damping inductor unit and resonant capacitor to store the AC electrical energy in the resonant circuit, and allows, when operating in a second phase, the AC electrical energy to be transferred to and stored in the clamping capacitor unit.

Methods and apparatus to increase efficiency for wireless power transfer

An example apparatus includes a feedback loop to: change a direction value when a second current value is greater than a first current value, the second current value being obtained after the first current value; and maintain the direction value when the second current value is less than the first current value. When the direction value corresponds to a first direction value, a summer increases a reference signal by a step size. When the direction value corresponds to a second direction value different than the first direction value, the summer decrease the reference signal by the step size.

Power supply device

A power supply device comprises a first boost converter configured to transmit electric power with conversion of a voltage between an electric load side and a power storage device side; a second boost converter connected in parallel to the first boost converter relative to an electric load and configured to transmit electric power with conversion of a voltage between the electric load side and the power storage side; and a control device configured to control the first boost converter and the second boost converter. At a predetermined time, the control device performs a loop current control that controls the first boost converter and the second boost converter such that a loop current flows in a closed circuit including the first boost converter and the second boost converter.

Circuits and methods providing dead time adjustment at a synchronous buck converter

An apparatus and method are disclosed for efficiently using power at a voltage regulator, such as a synchronous buck converter. The synchronous buck converter includes a first switch and a second switch operated by a first control signal and a second control signal, respectively, where the first and second control signals have a corresponding phase difference. A logic circuit measures a duty cycle of an input pulse width modulated (PWM) signal against iterative changes of the phase difference between the first control signal and the second control signal. The logic circuit selects a phase difference corresponding to a minimum value of the PWM signal, thereby optimizing dead time at the synchronous buck converter. The logic circuit may include a Digital Pulse Width Modulator.

Methods and circuitry for operating switching power supplies

Controllers and methods for controlling power supplies are disclosed herein. An example of a controller includes comparison circuitry operable to compare a switching frequency of the controller to a predetermined switching frequency. Voltage measuring circuitry is operable to measure the output voltage of the power supply. Circuitry is operable to disable at least one component in the power supply in response to the switching frequency being less than the predetermined switching frequency and the output voltage being greater than a predetermined output voltage.

MULTI-LEVEL HYSTERESIS VOLTAGE CONTROLLERS FOR VOLTAGE MODULATORS AND METHODS FOR CONTROL THEREOF

Systems and methods that facilitate multilevel hysteresis voltage control methods for cascaded multilevel voltage modulators having a plurality of power cells connected in series and has any positive integer number of output voltage levels to control any unipolar voltage on the load of the voltage modulator, and transfer electrical power from an electrical grid via AC/DC converters or directly from energy storage elements of the power cells to that load. A method of operational rotation of the power cells of a multilevel voltage modulator, which ensures an equal power sharing among the power cells and voltage balancing of the energy storage elements of the power cells of the modulator. 1. A multi-level cascaded voltage modulator connectable to a load , comprising:a plurality of power cells connected in series, wherein each cell of the plurality of cells comprises a of bidirectional switch and a storage element; anda control system coupled to the plurality of cells and having a multi-level hysteresis voltage controller, wherein the control system is configured to cause the plurality of cells to output N levels of voltage on the load, wherein N is a positive integer corresponding to the number of power cells of the plurality of power cells.245-. (canceled) The subject application is a continuation of U.S. patent application Ser. No. 16/704,797, filed Dec. 5, 2019, which is a continuation of PCT Patent Application No. PCT/US18/38089, filed Jun. 18, 2018, which claims priority to U.S. Provisional Patent Application No. 62/521,227, filed on Jun. 16, 2017, all of which are incorporated by reference herein in their entirety for all purposes.The present disclosure relates to power electronic circuits, and more particularly to multi-level hysteresis voltage controllers for voltage modulators and methods for control thereof.Voltage modulators have been used widely for broadcast, medical, industrial and research applications. The most common voltage modulation techniques ...

Control method and control device

A control method, which is applied to a conversion circuit including at least one bridge arm and an inductor, the bridge arm including an upper semiconductor switch and a lower semiconductor switch connected in series, and one end of the inductor being connected to a midpoint of the bridge arm, includes: judging a direction of current of the inductor when a scram event occurs in the conversion circuit; turning on the upper semiconductor switch and turning off the lower semiconductor switch when the direction of current of the inductor is judged as a first direction, wherein the first direction is a forward conduction direction of the lower semiconductor switch; and turning off the upper semiconductor switch and turning on the lower semiconductor switch when the direction of current of the inductor is judged as a second direction.

Bridge circuit and rectifier including the same

A bridge circuit includes: a first leg including a first switching device and a second switching device connected between a first node and a ground; a second leg including a third switching device and a fourth switching device connected between the first node and the ground; and a first charge recycler connected between a gate of the first switching device and a gate of the third switching device, and configured to transfer charges accumulated in the first switching device to the gate of the third switching device prior to turning on the third switching device.

Systems and methods for regulating power conversion systems with output detection and synchronized rectifying mechanisms

System and method for regulating a power conversion system. A system controller for regulating a power conversion system includes a first controller terminal and a second controller terminal. Additionally, the system controller is configured to receive an input signal at the first controller terminal, and generate a drive signal at the second controller terminal based at least in part on the input signal to turn on or off a transistor in order to affect a current associated with a secondary winding of the power conversion system. Moreover, the system controller is further configured to determine whether the input signal is larger than a first threshold at a first time, in response to the input signal being determined to be larger than the first threshold at the first time, determine whether the input signal is smaller than a second threshold at a second time.

LOAD LINE CIRCUIT AND ELECTRONIC DEVICE

This application provides a load line circuit and an electronic device, where the load line circuit is applied to the electronic device. A voltage value of a feedback voltage provided by the load line circuit to a switch-mode power supply is linearly and positively correlated with each of a voltage value of a first voltage and a current value of a first current, where the first voltage is a voltage provided to a load circuit, and the first current is a current provided to the load circuit. Through disposition of the load line circuit, the switch-mode power supply can implement a load line function. 1. A load line circuit , comprising:a first sampling circuit configured to generate a second voltage and provide the second voltage to a feedback circuit, wherein a voltage value of the second voltage is linearly and positively correlated with a voltage value of a first voltage, wherein the first voltage is a voltage provided by a switch-mode power supply to a load circuit, and wherein an output terminal of the first sampling circuit is coupled to a first input terminal of the feedback circuit;a second sampling circuit configured to generate a regulating voltage and provide the regulating voltage to the feedback circuit, wherein a voltage value of the regulating voltage is linearly and positively correlated with a current value of a first current, wherein the first current is a current provided by the switch-mode power supply to the load circuit, and wherein an output terminal of the second sampling circuit is coupled to a second input terminal of the feedback circuit; andthe feedback circuit configured to generate a feedback voltage based on the second voltage and the regulating voltage, and feed back the feedback voltage to the switch-mode power supply, wherein a voltage value of the feedback voltage is linearly and positively correlated with each of the voltage value of the second voltage and the voltage value of the regulating voltage, and wherein an output terminal ...

Body-diode conduction detector for adaptive controlling of the power stage of power converters

A circuit to detect body diode conduction in a switch with an adaptive dead-time scheme for a switched mode power supply. The body-diode of a first switch entering conduction means the first switch is OFF and a second switch can be turned ON. The body diode conduction detector circuit (BDCD) uses relative analysis of the switching node voltage (V LX ). The BDCD circuit acts as a voltage follower in a first phase and a comparator in a second phase. The BDCD circuit tracks V LX during the first phase and samples and holds V LX +V REF =V HOLD at the end of the first phase. During the second phase, the BDCD circuit compares V LX +V HOLD to V REF . When the body-diode of the first switch enters conduction V LX will become negative and V LX +V HOLD will drop below V REF , and toggle the logic level output of the comparator.

Power supply apparatus and image forming apparatus

The power supply apparatus includes a transformer having primary and secondary sides, a switching element, a feedback unit, a conversion unit that converts a current flowing in a primary winding of the transformer into a voltage, a control unit that controls operation of the switching element, a voltage switching unit that increases the voltage output from the conversion unit and feeds the increased voltage to the control unit when a continuous oscillation state is transited to an intermittent oscillation state. The voltage switching unit switches the voltage of the power supply that is input into the control unit to be higher when the continuous oscillation state is transited to the intermittent oscillation state.

Power supply unit

A power supply unit includes an electronic control unit that executes; a first control for controlling first and second converters such that a voltage of the load power line becomes a predetermined voltage by driving the first converter in a state where the second converter is stopped, and a second control for controlling the first and second converters such that the voltage of the load power line becomes the predetermined voltage by driving the second converter in a state where the first converter is stopped. The electronic control unit is configured to, when shifting from first to second control, control the first and second converters such that the voltage of the load power line becomes the predetermined voltage by driving the second converter, and stop the first converter after an output current of the first converter has become less than a predetermined current.

Parallel modular converter architecture

A system and method for providing power to a vehicle is disclosed. The system can include a plurality of parallel module converter modules (“modules”) each capable of supplying a predetermined electrical load. The plurality of parallel module converter modules can be networked to form a parallel module converter (“converter”) for prioritizing and allocating each electrical load to one or more parallel module converter modules. Each module can include an internal protection controller and a logic controller. The individual modules can provide power to various loads in the vehicle either alone, or in concert with other modules. The system can enable fewer power controllers to be used, saving weight and time. The controllers in the system can also be utilized at a higher level reducing unnecessary redundancy.

AIR CONDITIONER

An air conditioner has a power conversion device including: a reactor having a first end and a second end, the first end being connected to an AC power supply; a rectifier circuit that is connected to the second end of the reactor and includes a diode and at least one or more switching elements, the rectifier circuit converting an AC voltage outputted from the AC power supply into a DC voltage; and a detection unit detecting a physical quantity indicating an operation state of the rectifier circuit. Switching is made between control for a current from the AC power supply to be applied to the diode or control for the current to be applied to the switching element in accordance with an operating mode of the air conditioner. 1. An air conditioner including a power conversion device , the power conversion device comprising:a reactor having a first end and a second end, the first end being connected to an AC power supply;a rectifier circuit that is connected to the second end of the reactor and includes a diode and at least one or more switching elements, the rectifier circuit converting an AC voltage outputted from the AC power supply into a DC voltage; anda detection unit detecting a physical quantity indicating an operation state of the rectifier circuit,wherein the air conditioner makes switching between control for a current from the AC power supply to be applied to the diode and control for the current to be applied to the switching element in accordance with an operating mode of the air conditioner, andwhen the operating mode of the air conditioner corresponds to a cooling operation, the current from the AC power supply is applied to the diode.2. (canceled)3. An air conditioner including a power conversion device , the power conversion device comprising:a reactor having a first end and a second end, the first end being connected to an AC power supply;a rectifier circuit that is connected to the second end of the reactor and includes a diode and at least one or ...

High voltage current source with short circuit protection

A current source generating a charging current and a supply voltage by charging a capacitor with the charging current. The current source has a conversion circuit converting a line voltage into a second voltage, a current generation circuit generating the charging current based on the second voltage, and a control circuit controlling the current generation circuit based on the supply voltage. The charging current is controlled to be at a first current value when the supply voltage is lower than a first threshold voltage, the charging current is controlled to be at a second current value when the supply voltage is higher than a second threshold voltage. The first threshold voltage is lower than the second threshold voltage, and the first current value is lower than the second current value.

Current source inverter using bidirectional switches with bidirectional power flow capability

A switching circuit includes a reverse-voltage-blocking (RB) commutation switch, a first inverter leg, and a second inverter leg. The first inverter leg includes a first dual-gate bidirectional (DGBD) and a second DGBD switch connected in series. The second inverter leg includes a third and a fourth DGBD switch connected in series. A pair of the first DGBD switch, the second DGBD switch, the third DGBD switch, and the fourth DGBD switch that are in different inverter legs of the first inverter leg and the second inverter leg are configured to switch between a first DGBD on-state and a second DGBD on-state when in an inverting operating mode. A current with a positive or a negative polarity is conducted when in the first DGBD on-state. When in the second DGBD on-state, a reverse voltage is blocked by and a current with a positive polarity is conducted through the respective DGBD switch.

Voltage conversion device having improved inductor current cutoff speed

A voltage conversion device includes a current measurement means that is installed on a path through which the inductor current flows; a transistor that has a control terminal and an input terminal electrically connected to both ends of the current measurement means, and generates an inductor current cutoff signal when a voltage difference between both ends of the current measurement means exceeds detection set voltage; a reversal maintenance module that controls the charge control element in accordance with the inductor current cutoff signal of the transistor; and a pulse generation module that outputs a trigger pulse to the reversal maintenance module. According to the present invention, since a transistor having a high response speed is used for sensing an inductor current, a simple control is achieved, and even when a voltage of 100 V or higher is supplied, there is a very little amount of excess current.

Gate driver circuit for power converters incorporating normally on transistors and method thereof

The present invention is in relation to a synchronous buck converter comprising gate driver circuit, incorporated with passive elements for conversion of unipolar voltage produced by a standard gate driver to a bipolar voltage along with bootstrap technique to drive the normally on metal oxide semiconductor field effect transistor.

Isolated dc/dc converter, primary side controller, power adapter, and electronic device

An isolated DC/DC converter includes a transformer having a first winding and a secondary winding, a switching transistor connected to the primary winding of the transformer, a rectifier element connected to the secondary winding of the transformer, a photocoupler, a feedback circuit configured to drive a light emitting element on an input side of the photocoupler by a forward current corresponding to an error between an output voltage of the DC/DC converter and a target voltage of the DC/DC converter, a conversion circuit configured to convert a collector current flowing in a light receiving element on an output side of the photocoupler into a feedback voltage having a negative correlation with the collector current, a pulse signal generator configured to generate a pulse signal corresponding to the feedback voltage, and a driver configured to drive the switching transistor depending on the pulse signal.

Semiconductor power device and switching power supply apparatus

A current control element includes a control electrode, a first electrode, and a second electrode, is an element in which a current flowing from the second electrode to the first electrode is controlled by a voltage or a current between the control electrode and the first electrode, and does not include a built-in PN body diode between the first electrode and the second electrode, a rectifying element can be a Schottky barrier diode, a charge amount of the rectifying element at a time of reverse bias is smaller than an output charge amount of the current control element, an anode of the rectifying element and a cathode of the rectifying element are electrically connected to the auxiliary terminal and the second electrode, respectively, and the control electrode, the first electrode, and the second electrode are electrically connected to the control terminal, the first terminal, and the second terminal, respectively.

Improvements in or relating to the control of voltage source converters

A method of controlling a voltage source converter including a converter limb corresponding to a respective phase of the converter, each converter limb extending between first and second DC terminals and including first and second limb portions separated by an AC terminal and each limb portion including a chain-link converter which is operable to provide a stepped variable voltage source, includes the steps of obtaining a AC current demand phase waveform and a DC current demand for each corresponding converter limb is configured to track, and carrying out mathematical optimization to determine an optimal limb portion current for each limb portion must contribute to track the corresponding required AC current demand phase waveform and the required DC current demand while minimising current conduction losses within each limb portion and additionally managing the energy stored by each chain-link converter.

Rectifier device

A rectifier is described herein. According to one example, the rectifier includes a semiconductor substrate and further includes an anode terminal and a cathode terminal connected by a load current path of a first MOS transistor and a diode that is connected parallel to a load current path. An alternating input voltage is operably applied between the anode terminal and the cathode terminal. Further, the rectifier includes a control circuit that is configured to switch the first MOS transistor on for an on-time period, during which the diode is forward biased. The first MOS transistor, the diode, and the control circuit are integrated in the semiconductor substrate.

Isolated switching converter with optocoupler and secondary control circuit thereof

An isolated switching converter includes a transformer, a primary circuit, a rectifying circuit and an optocoupler with a photo-sensitive device and a light emitting device, wherein the light emitting device has a first terminal coupled to an output voltage of the switching converter. A method for controlling the switching converter includes: sensing the output voltage and generating a voltage feedback signal; generating an error amplifying signal based on a reference signal and the voltage feedback signal, and providing the error amplifying signal to a second terminal of the light emitting device; disconnecting the error amplifying signal from the second terminal of the light emitting device if the error amplifying signal becomes lower than a first threshold voltage; and reconnecting the error amplifying signal to the second terminal of the light emitting device when the voltage reference signal becomes lower than a second threshold voltage.

Power supply system

A power supply system that includes a converter that converts an input alternating-current voltage into a direct-current voltage and outputs the direct-current voltage to a load. The system includes a switcher that electrically connects one of multiple alternating-current power supplies to the converter, a voltage detector that detects an input voltage input to the converter, and a current detector that detects an output current output from the converter. The switcher repeats, for a predetermined amount of time, a determination of whether there is an abnormality in alternating-current power supply based on the input voltage detected by the voltage detector. Moreover, if there is an abnormality, the switcher switches which alternating-current power supply is connected to the converter. Further, the switcher adjusts, based on the result of detection by the current detector, the amount of time for which the determination is performed.

Wireless power receiver circuit

A wireless power receiver circuit forms a wireless power receiving apparatus together with a reception coil. An internal power supply line is connected to a capacitor C. An output line is connected to a secondary battery. An H-bridge circuit includes N-channel MOSFETs MH 1, MH 2, ML 1, and ML 2 . A first switch is arranged between a rectification line and the internal power supply line. A second switch is arranged between the rectification line and the output line. A voltage V DD of the internal power supply line is supplied to a power supply terminal of a controller.

Multi-level hysteresis voltage controllers for voltage modulators and methods for control thereof

Systems and methods that facilitate multilevel hysteresis voltage control methods for cascaded multilevel voltage modulators having a plurality of power cells connected in series and has any positive integer number of output voltage levels to control any unipolar voltage on the load of the voltage modulator, and transfer electrical power from an electrical grid via AC/DC converters or directly from energy storage elements of the power cells to that load. A method of operational rotation of the power cells of a multilevel voltage modulator, which ensures an equal power sharing among the power cells and voltage balancing of the energy storage elements of the power cells of the modulator.

High Power Density Inverter (I)

The present invention relates to a single phase, non-insulated, miniaturized DC/AC power inverter ( 1 ) having an output power density higher than 3000 W/dm 3 , wherein said first (S 1 _H), second (S 1 _L), third (S 2 _H) and fourth (S 2 _L) switches are made of wide-band semiconductors and preferably of gallium nitride or GaN semiconductors; and wherein said DC/AC power inverter ( 1 ) further comprises: a ripple-compensating active filter comprising a third half-bridge ( 203 ) having a fifth switch (S 3 _H) in series with a sixth switch (S 3 _L), said fifth switch (S 3 _H) being connected at one end to the positive terminal (L+) of the DC input, said sixth switch (S 3 _L) being connected at one end to the negative terminal (L−) of the DC input,the other end of the fifth switch (S 3 _H) being connected to the other end of the sixth switch (S 3 _L), defining a third common end, said third common end being connected to a first end of a LC filter, made of at least one inductor (L 6 ) and one storage capacitor (C 5 ), a second end of the LC filter being connected to the negative terminal (L−); modulation control means of said first (S 1 _H), second (S 1 _L), third (S 2 _H), fourth (S 2 _L), fifth (S 3 _H) and sixth (S 3 _L) switches for providing a switch frequency comprised between 20 and 500 kHz and allowing variable phase shifts between any two of said first ( 201 ), second ( 202 ) and third ( 203 ) half-bridges and allowing dead time modulation of the switches of said half-bridges ( 201, 202, 203 ), so that to obtain a switching approaching ZVS switching, in particular to obtain switching when current crosses through zero and further to cancel switching losses and so that to allow high peak-to-peak voltage variations in the active filter, while storing corresponding energy in the storage capacitors (C 5 ), wherein the Y-capacitors of the common mode noise filter ( 100 ), are referenced to a shielding being at a reference potential, said shielding being insulated ...

Synchronous rectification module

The present invention provides a synchronous rectification module. The synchronous rectification module includes a circuit board, a transformer, two synchronous rectification sets and a grounding set. The transformer includes a primary winding and a secondary electrically-conductive foil winding. The first and second synchronous rectification sets are symmetrically disposed on the circuit board, corresponding to the transformer and electrically connected to a secondary dotted end tap and a secondary synonyms end tap of the secondary electrically-conductive foil winding respectively. The secondary electrically-conductive foil winding of the transformer is disposed nearby a lateral edge of the first or second synchronous rectification set, and the grounding set is disposed along a bottom edge of the circuit board and nearby the bottom edge of the first or second synchronous rectification set, so as to reduce the current path of the secondary synchronous rectification circuit and achieve the purposes of miniaturization and high power density.

Rotating switching strategy for power converters

Systems and methods for operating a power converter with a plurality of inverter blocks with silicon carbide MOSFETs are provided. A DC to AC converter can include a plurality of inverter blocks. Each inverter block can include a plurality of switching devices. A control method can include identifying one of a plurality of switching patterns for operation of the inverter block for each inverter block. Each switching pattern can include a plurality of switching commands. The control method can further include controlling each inverter block based on the identified switching pattern for the inverter block. The control method can further include rotating the switching patterns among the plurality of inverter blocks.

Synchronous rectifier control with adaptive minimum off-time

A switching power converter may include a power switch coupled to a primary winding of a transformer, and a primary controller configured to turn on and off the power switch, a synchronous rectifier switch coupled to a secondary winding of a transformer, and a synchronous rectifier controller configured to turn on and off the synchronous rectifier switch. The synchronous rectifier controller may monitor a voltage across the synchronous rectifier switch. The synchronous rectifier controller may determine a period of a resonant oscillation of the voltage across the synchronous rectifier switch following at least one cycling off of the synchronous rectifier switch. The synchronous rectifier controller may adjust the minimum off-time period for the synchronous rectifier switch based on the period of the resonant oscillation. The synchronous rectifier controller may adaptively adjust a minimum off-time period for the synchronous rectifier switch.

Power supply system, a switched tank converter, and methods thereof

A power supply system, which has a switched-tank converter with an adjustable conversion ratio, includes a first-stage power converter, a second-stage power converter, and a controller. The first-stage power converter converts a supply voltage to a first output voltage, and modulates the first output voltage according to a modulation signal. A second-stage power converter converts the first output voltage to a second output voltage, and generates a power signal according to the output power of the second output voltage. The controller determines, according to the power signal, whether the output power exceeds a threshold to generate the modulation signal.

MODULAR HIGH STEP-DOWN DC/DC CONVERTER

Method and apparatus include a circuit having a duty cycle and interleaving modulation configured to realize high density and efficient energy transfer. The circuit may efficiently achieve higher step-down voltage ratios with fewer electrical components. For example, as few as seven electrical devices, such as switches and diodes, may be used to realize at least a four-to-one conversion ratio. The high density of the circuit is advantageous to meet shrinking space demands. A modulator may interleave signals sent to the electrical components (e.g., switching devices via driver circuitry). The driver signals may include a duty cycle of 1/(nc+1), where nc is (n−1)/3, and n is the number of devices. 1. An apparatus comprising:at least two switching components configured to perform a switching function;at least two conductivity arbitrating devices in electrical communication with the at least two switching components; anddriver circuitry configured to deliver a plurality of driver signals to the at least two switching components, wherein the plurality of driver signals include interleaved modulation and a duty cycle configured to step-down a direct current (DC) voltage.2. The apparatus of claim 1 , further comprising a modulator configured to interleave a plurality of duty cycle signals delivered to the driver circuitry.3. The apparatus of claim 1 , wherein the duty cycle changes as a function of a number of the at least two switching components and a number of the at least two conductivity arbitrating devices.4. The apparatus of claim 1 , further comprising a modulator configured to generate a plurality of duty cycle signals having a duty cycle equal to 1/(nc+1) claim 1 , wherein nc is (n−1)/3 claim 1 , and n is a number of the at least two switching components plus a number of the at least two conductivity arbitrating devices.5. The apparatus of claim 1 , wherein the at least two conductivity arbitrating devices include at least one of a diode and an additional switch. ...

CONTROL UNIT FOR IMPROVING CONVERSION EFFICIENCY

A control unit is provided. The control unit is configured to provide a control signal for controlling a power unit. The power unit comprises a first positive voltage terminal, a second positive voltage terminal, a first negative voltage terminal, a second negative voltage terminal, and a switching element. The first negative voltage terminal and the second positive voltage terminal are coupled to each other in a short circuit manner. One terminal of the switching element is electrically connected to the first negative voltage terminal. The control unit is configured to: receive a pulse width modulation signal; receive a first power supply signal; receive a second positive voltage terminal signal; output a second power supply signal; and output the control signal for controlling the switching element to be turned on or turned off. 1. A control unit , configured to provide a control signal for controlling a power unit , wherein the power unit comprises:a first positive voltage terminal;a second positive voltage terminal;a first negative voltage terminal; anda second negative voltage terminal, wherein the first negative voltage terminal and the second positive voltage terminal are coupled to each other in a short circuit manner; anda switching element, wherein one terminal of the switching element is electrically connected to the first negative voltage terminal;wherein the control unit is configured to:receive a pulse width modulation signal, wherein a reference ground of the pulse width modulation signal is the second negative voltage terminal;receive a first power supply signal;receive a second positive voltage terminal signal;output a second power supply signal, wherein a voltage difference between the second power supply signal and the second positive voltage terminal signal is larger than zero; andoutput the control signal for controlling the switching element to be turned on or turned off, wherein a reference ground of the control signal is the second positive ...

Absorption circuit, feed circuit and liquid crystal display

The absorption circuit of the present invention is applied in a feed circuit, wherein the absorption circuit comprises a comparison unit and a regulation unit, and the comparison unit is employed to receive a voltage of a transformer primary dotted terminal of the feed circuit, and to compare the voltage with a first preset voltage and a second preset voltage and to output a comparison result, and the regulation unit is employed to regulate a resistor and a capacitor coupled to the transformer according to the comparison result, wherein the first preset voltage is larger than the second preset voltage. Therefore, the present invention can control the resistor and the capacitor coupled to the transformer according to the leakage inductance (i.e. the voltage) of the transformer, and then to adaptively restrain the corresponding voltage peak and EMI.

Double conversion on line ups with pass through neutral employing single dc bus

An Uninterruptible Power Supply (UPS) system, the UPS system comprising an input configured to receive input AC power having an input voltage level and an input frequency, an output configured to provide output AC power to a load, the output power having an output voltage level and an output frequency, a converter coupled to the input and configured to convert the input AC power into DC power, an inverter coupled to the output and configured to convert the DC power into the output AC power and provide the output AC power to the output, a DC bus coupled between the converter and the inverter including a first capacitive element and a second capacitive element, the first capacitive element being coupled to a first output and a second output of the converter and the second capacitive element being coupled to a first input and a second input of the inverter, a de-coupler circuit coupled between the first and second capacitive elements and configured to selectively decouple the inverter from the converter, and a controller configured to operate the converter, the inverter, and the de-coupler circuit in a first mode of operation such that the output voltage level and output frequency of the output AC power are the same as the input voltage level and input frequency of the input AC power and a second mode of operation such that at least one of the output voltage level or output frequency of the output AC power differs from the input voltage level and input frequency of the input AC power.

Boost converter

A boost converter includes a voltage divider circuit, a first comparator, a tunable inductive element, a power switch element, a second comparator, an output stage circuit, and a controller. The voltage divider circuit receives an input voltage. The tunable inductive element is coupled to the voltage divider circuit. The total inductance of the tunable inductive element is controlled by the first comparator. The output stage circuit is coupled to the tunable inductive element and the power switch element. The output stage circuit includes a tunable resistive element. The total resistance of the tunable resistive element is controlled by the second comparator. When the boost converter operates in a first mode, an output voltage of the output stage circuit has a relatively high voltage level. When the boost converter operates in a second mode, the output voltage of the output stage circuit has a relatively low voltage level.

Drive signal generating circuit and power supply circuit

A drive signal generating circuit that generates a drive signal for turning on and off a transistor based on an output voltage and an inductor current flowing through an inductor, includes: a reference current output unit that outputs a reference current serving as a reference for the inductor current; a command value output unit that outputs a command value for increasing and decreasing the inductor current when the inductor current is smaller and greater than the reference current, respectively; and a drive signal output unit that outputs the drive signal based on the command value such that the output voltage achieves a target level, the reference current output unit configured to output the reference current based on the command value output from the command value output unit and a value corresponding to a first error between a level of the output voltage and the target level.

Low Forward Voltage Rectifier Using Capacitive Current Splitting

A Low Forward Voltage Rectifier (LFVR) circuit includes a bipolar transistor, a parallel diode, and a capacitive current splitting network. The LFVR circuit, when it is performing a rectifying function, conducts the forward current from a first node to a second node provided that the voltage from the first node to the second node is adequately positive. The capacitive current splitting network causes a portion of the forward current to be a base current of the bipolar transistor, thereby biasing the transistor so that the forward current experiences a low forward voltage drop across the transistor. The LFVR circuit sees use in as a rectifier in many different types of switching power converters, including in flyback, Cuk, SEPIC, boost, buck-boost, PFC, half-bridge resonant, and full-bridge resonant converters. Due to the low forward voltage drop across the LFVR, converter efficiency is improved.

Supply Voltage Management

A method for the start-up and/or the maintenance of a supply voltage for a driver circuit for a solid state light source is described. The driver circuit comprises a switched-mode power converter with a switch and a transformer. The switched-mode power converter converts an input voltage into an output voltage. The driver circuit has a controller which generates a gate control signal for putting the power converter switch into an on-state or an off-state. The driver circuit comprises a supply voltage capacitor to provide a voltage to the controller. A primary coil of the transformer is arranged in series with the power converter switch. A secondary coil arrangement of the transformer provides the output voltage. and is coupled to the supply voltage capacitor via a supply voltage transistor which is controlled such that the supply voltage provided by the supply voltage capacitor lies within a pre-determined voltage interval.

Driving Apparatus For Switching Element

A power conversion circuit is mounted in a vehicle and controls an output torque of the rotating machine based on a requested command torque. A driving apparatus of a switching element controls a current flowing to the rotating machine. The driving apparatus sets at least one of a turn-on speed and a turn-off speed for the switching element to a plurality of switching speeds that are discretely determined, based on a parameter that is correlated with the output torque and has a controllable value. The driving apparatus turns on or off the switching element at the switching speeds. The switching speeds are allocated to the respective magnitudes of the parameter at uneven intervals, and determined such that the number of allocated switching speeds is greater in a range in which an occurrence frequency of the parameter is high, compared to a range in which the occurrence frequency is low.

Power conversion device, motor driving device including power conversion device, blower and compressor including motor driving device, and air conditioner, refrigerator, and freezer including blower and compressor

A power conversion device includes an inverter configured by arms including phase upper-arm switching elements and phase lower-arm switching elements, a power-supply shunt resistor, lower-arm shunt resistors, and a control unit that generates drive signals corresponding to the phase upper-arm switching elements and the phase lower-arm switching elements from detection values of the voltage detectors. The power conversion device changes a ratio of time in which all of the upper-arm switching elements are in an ON state and time in which all of the lower-arm switching elements are in the ON state in one cycle of switching of the inverter according to a modulation ratio.

Power supply system, dc/dc converter, and power conditioner

A power supply system for recovering degraded performance of a solar cell due to PID is provided. The power supply system includes a solar cell, a non-isolated type DC/DC converter that boosts a DC voltage from the solar cell input from an input end with a predetermined boosting ratio and outputs a DC voltage from an output end, and an inverter that converts a DC voltage output from the output end of the DC/DC converter into an AC voltage, the power supply system being connected to an external power system for system interconnection, wherein the power supply system includes a potential adjustment device for applying a voltage of an external power system to the solar cell via the inverter to set a ground potential of a negative electrode of the solar cell to positive when an output of the solar cell is smaller than a predetermined value.

Method of controlling the switching of a multilevel converter, a controller for a multilevel converter, and a computer program for controlling a converter

A method of controlling a multilevel converter, a computer program and a controller for a converter is provided. The method includes determining a transition voltage from a control period to a following control period, analyzing the switching cells of each phase leg, selecting capacitors to provide the transition voltage and synthesize the output voltage for the following control period, and connecting the selected capacitors during the following control period. The analyzing of each switching cell includes analyzing a first switching leg and a second switching leg of the switching cell. The method includes determining whether a change of state of the first switching leg would contribute to the direction of the transition voltage, and determining whether a change of state of the second switching leg would contribute to the direction of the transition voltage, and determining the internal conditions of each of the first and the second switching leg that are determined as contributing to the transition. Thus, the two legs of the H-bridge are analyzed separately. The selecting of capacitors is performed by selecting the capacitors of the switching legs of the phase leg for the transition voltage on the basis of the determined internal conditions of the switching legs, including comparing the internal conditions of all the switching legs of the phase leg. A controller is configured to control the multilevel converter by performing the method.

DRIVE SYSTEM

A drive system includes: first and second inverters; a high-potential-side connection line; a low-potential-side connection line; a first changeover switch provided to at least one of the high-potential-side and low-potential side connection lines; a second changeover switch connected in parallel to the first changeover switch; a mode control section changing between a first mode in which to perform switching driving of upper and lower arm switches in one of the inverters and perform neutral point driving of at least one of the upper and lower arm switches in the other inverter to maintain in an on state and a second mode in which to perform switching driving of the upper and lower arm switches in both the inverters; and a changeover control section that, at the time of a changeover between the first and second modes, changes the first and second changeover switches between the on and off states. 1. A drive system applied to a rotating electrical machine system having a rotating electrical machine with multi-phase windings , the drive system comprising:a first inverter that has an upper arm switch and a lower arm switch connected in series in each phase and has a connection point between the upper arm switch and the lower arm switch connected to a first end of the winding of each phase;a second inverter that has an upper arm switch and a lower arm switch connected in series in each phase and has a connection point between the upper arm switch and the lower arm switch connected to a second end of the winding of each phase;a high potential side connection line that connects a high potential side of the first inverter and a high potential side of the second inverter;a low potential side connection line that connects a low potential side of the first inverter and a low potential side of the second inverter;a first changeover switch that is a semiconductor switch provided to at least one of the high potential side connection line and the low potential side connection ...

Drive circuit for switch

A drive circuit for a switch drives an upper-arm switch and a lower-arm switch that include body diodes. Of the body diodes in upper- and lower-arm switches, the diode through which a feedback current flows during a dead time is a target diode. Of the upper- and lower-arm switches, the switch that includes the target diode is a target switch. The remaining switch is an opposing arm switch. The drive circuit maintains an electric potential of a control terminal relative to a second terminal of the target switch at a negative voltage over a period from a timing subsequent to a start timing of a dead time immediately after the target switch is switched to an off-state until a point within a period over which the opposing arm switch is set to an on-state, and subsequently maintains the electric potential at an off-voltage until a next dead time is ended.

Non-contact electric power feeding system, terminal device, non-contact electric power feeding device, and non-contact electric power feeding method

Provided is a non-contact electric power feeding system including an electric power feeding device, and an electric power receiving device configured to receive electric power fed from the electric power feeding device. The electric power feeding device includes a primary-side coil, a driver, a primary-side control unit, and a primary-side communication unit. The electric power receiving device includes a secondary-side coil, a rectifier unit, a regulator, a secondary-side communication unit, and a secondary-side control unit.

Dynamic reduction of synchronous rectifier power losses

Methods and circuits for controlling a synchronous rectifier. An operating condition of the synchronous rectifier is detected. A voltage level applied to turn on at least one transistor of the synchronous rectifier us modified based upon the detected operating condition, to improve efficiency of the synchronous rectifier.