Patent RU2017118086A3

РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2017 118 086 A (51) МПК H02J 3/36 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ЗАЯВКА НА ИЗОБРЕТЕНИЕ (21)(22) Заявка: 2017118086, 09.12.2015 (71) Заявитель(и): НР ЭЛЕКТРИК КО., ЛТД. (CN), НР ЭЛЕКТРИК ИНЖИНИРИНГ КО., ЛТД. (CN) Приоритет(ы): (30) Конвенционный приоритет: 23.12.2014 CN 201410812231.2 33 (85) Дата начала рассмотрения заявки PCT на национальной фазе: 24.05.2017 CN 2015/096747 (09.12.2015) (87) Публикация заявки PCT: WO 2016/101787 (30.06.2016) A Адрес для переписки: 123100, Москва, Шмитовский пр., 2, стр. 2, Агентство "Ермакова, Столярова и партнеры" R U (57) Формула изобретения 1. Способ переключения с пассивного секционирования на подключение к энергосистеме для системы передачи постоянного тока высокого напряжения на основе преобразователя напряжения (ПТВН-ПН), отличающийся тем, что он включает следующие этапы: (1) когда преобразовательная подстанция системы передачи ПТВН-ПН находится в рабочем состоянии пассивного секционирования: определение наличия перегрузки по трехфазному переменному току на стороне вентиля преобразователя или по току на плече моста преобразователя, и установление постоянного значения перегрузки по току на n-кратный номинальный ток плеча моста; в случае возникновения перегрузки по току, при ее длительности t1, выполнение этапа (2); в противном случае повторное выполнение этапа (1); (2) блокировка преобразователя и определение, не является ли напряжение на стороне переменного тока меньше, чем пороговое значение; если напряжение ниже порогового значения и его длительность составляет t2, разблокировка преобразователя, и повторное выполнение этапа (1); в противном случае - выполнение этапа (3); (3) управление настройкой контура фазовой синхронизации системы для отслеживания текущей фазы напряжения на стороне переменного тока, и одновременно начало переключения режима управления, переключение из текущего режима изолированного Стр.: 1 A 2 0 1 7 1 1 8 0 8 6 (54) СПОСОБ ...

СПОСОБ ПЕРЕКЛЮЧЕНИЯ С ПАССИВНОГО СЕКЦИОНИРОВАНИЯ НА ПОДКЛЮЧЕНИЕ К ЭНЕРГОСИСТЕМЕ

Wechselrichteranordnung

Wechselrichteranordnung, mit: einem Wechselrichter (20), der einen Gleichstromeingang mit einem Gleichstrom-Pluspol und einem Gleichstrom-Minuspol aufweist; wenigstens zwei Gleichstromeingängen zum Anschließen der Wechselrichteranordnung (100) an Gleichstromquellen, wobei jeder der Gleichstromeingänge einen Gleichstrom-Pluspol und einen Gleichstrom-Minuspol aufweist; einer separaten Eingangssicherung (30) für jeden der Gleichstrompole eines jeden der wenigstens zwei Gleichstromeingänge der Wechselrichteranordnung, wobei jeder der Gleichstrom-Pluspole der wenigstens zwei Gleichstromeingänge der Wechselrichteranordnung an eine erste Klemme der entsprechenden separaten Eingangssicherung (30) angeschlossen ist, wobei eine zweite Klemme an den Gleichstrom-Pluspol des Gleichstromeingangs des Wechselrichters (20) angeschlossen ist, und wobei jeder der Gleichstrom-Minuspole der wenigstens zwei Gleichstromeingänge der Wechselrichteranordnung an eine erste Klemme der entsprechenden separaten Eingangssicherung ...

Schaltungseinrichtung und Verfahren, insbesondere für Photovoltaik-Generatoren

INDUCTION HEATING APPARATUS

SAFETY DIVICE of a STEPLESS GOVERNOR including FILTER THROTTLE

DEVICE FOR THE PROTECTION OF AN INVERTER

REDUCING PHOTOVOLTAIC ARRAY VOLTAGE DURING INVERTER RE-ENABLEMENT

An apparatus for harvesting solar power includes a photovoltaic array for generating a DC voltage; a discharge circuit for causing the DC voltage to decay from a first value to a second value; and an inverter circuit for transforming an output voltage from the discharge circuit into an AC voltage.

METHOD FOR ELIMINATING AN ARC DRIVEN BY MEANS OF AT LEAST ONE PHASE VOLTAGE SOURCE OF A CONVERTER CIRCUIT

What is specified is: A method for eliminating an arc driven by means of at least one phase voltage source (3) of a converter circuit (1), in which method the converter circuit has a converter unit (2) and an energy storage circuit (4), wherein the at least one phase voltage source (3) is connected on the AC voltage side of the converter unit (2), and wherein the converter unit (2) has a multiplicity of actuable power semiconductor switches, and in which, during operation of the converter circuit (1), an arc which occurs is detected and, thereupon, the at least one phase voltage source (3) is short-circuited. In order to detect the arc, either a state variable of the converter circuit (1) is monitored for a predeterminable threshold value of the state variable or alternatively the surrounding environment of the converter circuit is monitored visually for the occurrence of an arc light. If an arc is then detected, at least some of the actuable power semiconductor switches of the converter ...

Von einer stabilisierten Gleichspannungsquelle gespeister Wechselspannungsgenerator

Schaltung zum Überspannungsschutz von gesteuerten Halbleitergleichrichtern oder Transistoren

Method for eliminating an electric arc driven by at least one voltage source of an inverter circuit

The invention relates to a method for eliminating an electric arc that is driven by at least one phase voltage source (3) of an inverter circuit (1), said inverter circuit having an inverter unit (2) and an energy storage circuit (4). The at least one phase voltage source (3) is connected to the inverter unit (2) on the alternating voltage side, the inverter unit (2) having a plurality of controllable power semiconductor switches. According to said method, an electric arc produced during operation of the inverter circuit (1) is detected and the at least one phase voltage source (3) is short-circuited. In order to detect the electric arc, either a state variable of the inverter circuit (1) is monitored for a definable threshold value or alternatively the surroundings of the inverter circuit is optically monitored for the occurrence of an electric arc. If an electric arc is detected, at least part of the controllable power semiconductor switches of the inverter unit (2) is controlled such ...

SAFETY DEVICE Of a VARIABLE SPEED TRANSMISSION INCLUDING an INDUCTANCE OF FILTERING.

DEVICE SAFETY Of a VARIABLE SPEED TRANSMISSION AGAINST the OVERCURRENTS.

L'invention concerne un variateur de vitesse comportant :- un module redresseur (12) pour générer sur un bus de puissance (10, 11) une tension continue à partir d'une tension alternative disponible sur un réseau électrique d'alimentation (A),- un condensateur de bus (Cb) connecté entre une ligne positive et une ligne négative du bus de puissance, et- un module onduleur (13) alimenté par le bus de puissance et commandé pour délivrer une tension alternative à une charge électrique (2),- un dispositif de protection (14) du variateur contre les surintensités liées à des variations de tension sur le réseau électrique d'alimentation (A). The invention relates to a variable speed drive comprising: - a rectifier module (12) for generating on a power bus (10, 11) a DC voltage from an AC voltage available on an electrical supply network (A) a bus capacitor (Cb) connected between a positive line and a negative line of the power bus, and an inverter module (13) powered by the power bus and controlled to deliver an alternating voltage to an electric load (2). ), a protection device (14) of the drive against overcurrents related to voltage variations on the power supply network (A).

지락전류 차단이 가능한 계통연계형 태양광 발전 장치

... 본 발명에서는 지락전류 차단이 가능한 계통연계형 태양광 발전 장치에 있어서, 태양광을 받아서 전기에너지를 생산하는 태양전지(100); 상기 태양전지(100)와 접속된 배전반(101); 상기 배전반(101)과 접속되어 상기 태양전지(100)의 출력전압을 승압시키는 승압형 DC-DC 변환부(102-1); 상기 승압형 DC-DC 변환부(102-1)와 접속되며, 직류(DC) 전압을 교류(AC) 전압으로 변환하여 계통(103)에 전력을 공급하는 DC-AC 변환부(102-2); 상기 DC-AC 변환부(102-2)의 제1 출력라인(103-1) 및 제2 출력라인(103-2)에 흐르는 전류의 합(合)을 검출하는 전류감지기(104); 상기 전류감지기(104)의 전류 정보를 아날로그에서 디지털로 변환시키는 ADC 변환부(111); 상기 ADC 변환부(111)에서 출력된 디지털로 변환된 전류 정보를 실효치(RMS: Root Mean Square) 전류 정보로 변환시키는 RMS 변환부(112); 상기 RMS 변환부(112)의 출력을 바탕으로 접지(Ground)로 전류가 흐르는 지락여부를 판단하는 지락 판단부(113); 상기 전류감지기(104)의 전류 정보를 증폭시키는 증폭부(115); 상기 증폭부(115)를 통해 증폭된 전류 정보와 설정값(107)을 비교하는 비교기(116); 상기 지락 판단부(113)의 출력 및 상기 비교기(116)의 출력을 입력받는 PWM 발생부(114); 상기 지락 판단부(113)에서 접지(Ground)로 전류가 흐르는 지락으로 판단되면, PWM 발생부(114)에서는 인에이블(Enable) 신호를 차단하여 모든 인버터의 스위칭 소자(Q1 내지 Q4)를 오프(OFF)시키며; 상기 증폭부(115)를 통해 증폭된 전류 정보와 설정값(107)을 비교하여 상기 비교기(116)에서 출력 신호가 발생하면, PWM 발생부(114)에서는 인에이블(Enable) 신호를 차단하여 모든 인버터의 스위칭 소자(Q1 내지 Q4)를 오프(OFF)시키며; 상기 태양전지(100)의 (-) 출력단자와 ...

Motor drive apparatus performing algorithm for preventing abnormal operation

Systems and methods for protecting power conversion systems under open and/or short circuit conditions

System and method are provided for protecting a power converter. The system includes a first comparator, and an off-time component. The first comparator is configured to receive a sensing signal and a first threshold signal and generate a first comparison signal based on at least information associated with the sensing signal and the first threshold signal, the power converter being associated with a switching frequency and further including a switch configured to affect the primary current. The off-time component is configured to receive the first comparison signal and generate an off-time signal based on at least information associated with the first comparison signal. The off-time component is further configured to, if the first comparison signal indicates the sensing signal to be larger than the first threshold signal in magnitude, generate the off-time signal to keep the switch to be turned off for at least a predetermined period of time.

PROTECTIVE CIRCUIT FOR AN INTERMEDIATE CIRCUIT OF AN INVERTER, PARTICULARLY A SOLAR INVERTER, AGAINST OVERVOLTAGES

The invention relates to an input-side protective circuit (5) for protecting an intermediate circuit (2) of an inverter (1) against overvoltages. The protective circuit (5) comprises an upstream element (RV) for limiting the voltage of the intermediate circuit (2) which is connected upstream of the intermediate circuit (2) and which can be bypassed by means of a mechanical switching means (7) which can be controlled. The mechanical switching means (7) can be controlled in such a way that said mechanical switching means opens in the feed-in operation of the inverter (1) in the event of an intermediate circuit voltage (uZK) greater than a specified voltage limit (UG). According to the invention, the protective circuit (5) comprises an electronic voltage limiter (6) connected downstream of the upstream element (RV) and connected in parallel to the intermediate circuit (2).

ARRANGEMENT COMPRISING A POWER CONVERTER

The invention relates to, inter alia, an arrangement comprising a power converter (20), which has an AC voltage side (21) and a DC voltage side (22). The invention provides that a short-circuiting circuit (60) is indirectly or directly connected to the AC voltage side (21) of the power converter (20), wherein the short-circuiting circuit (60) is suitable for producing an additional short circuit on the AC voltage side (21) of the power converter (20) in the event of a short circuit on the DC voltage side (22) of the power converter (20) and thereby reducing the single-phase or polyphase AC voltage present on the AC voltage side (21) of the power converter (20).

INVERTER CONTROL DEVICE

In a multilayer printed circuit board (circuit board ) having an inverter (switching elements ) mounted thereto, only a second wiring pattern P arranged downstream of a semiconductor relays and able to shut off an electric power supply and a third wiring pattern P arranged upstream of a shunt resistor and able to detect an overcurrent are placed in adjacent layers in a manner to face each other, and thus, even if the mutually facing portions (laminated portion) of the these two wiring patterns P and P are subjected to short circuit, an overcurrent caused by the short circuit can be detected by the shunt resistor and the electric power supply to the switching elements can be shut off by the switching elements , so that overheating at the second and third wiring patterns P and P can be avoided. 14.-. (canceled)5. An inverter control device having a multilayer printed circuit board and an inverter mounted to the circuit board , comprising:an electric power shutting means arranged in an electric power line to shut off an electric power supply to the inverter; andan overcurrent detecting means arranged in a ground line to detect an overcurrent of the inverter,wherein at least one wiring part of the electric power line arranged downstream of the electric power shutting means and at least one wiring part of the ground line arranged upstream of the overcurrent detecting means are placed to face each other in adjacent layers spaced apart in a laminating direction of the multilayer printed circuit board, andwherein a wiring of the electric power line arranged upstream of the electric power shutting means and a wiring of the ground line arranged downstream of the overcurrent detecting means are placed not to face each other in adjacent layers spaced apart in the laminating direction of the multilayer printed circuit board.6. An inverter control device having a multilayer printed circuit board and an inverter mounted to the circuit board , comprising:an electric power shutting ...

Protection Circuit for Protecting an Intermediate Circuit of a Solar Inverter Against Overvoltages

An input-side protective circuit for protecting an intermediate circuit of an inverter against overvoltages, wherein the input-side protective circuit includes an upstream element for limiting the voltage of the intermediate circuit connected upstream of the intermediate circuit and which is bridgeable by a mechanical switching device that is controllable such that it opens in a feed-in operation of the inverter when an intermediate circuit voltage is greater than a specified voltage limit. The protective circuit also includes an electronic voltage limiter connected downstream of the upstream element and connected in parallel to the intermediate circuit.

Switching device and method, in particular for photovoltaic generators

The subject matter of the invention is an inverter (3), more specifically for use in a photovoltaic plant (1) with a direct voltage input (connection terminals 4; 5) for connection to a generator (2) and an alternating voltage output (connection terminals 7; 8) for feeding into an energy supply network (6) as well as with a DC-AC converter (12) with semiconductor switch elements (15) and an intermediate circuit (11), at least one short-circuit switch element (18) being connected in parallel to the generator (2), so that the voltage will not exceed a maximum voltage value neither at the connection terminals (4; 5) of the generator (2) nor between the connection terminals (9; 10) of the inverter. This is achieved in that the inverter (3) comprises, in the intermediate circuit (12), a buffer capacitor (14) that is connected to the generator (2) through a protection diode (17) so that said buffer capacitor (14) will not be discharged upon actuation of the short-circuit switch element (18), ...

Multiphase Current Supplying Circuit, Driving Apparatus, Compressor And Air Conditioner

A multiphase current supplying circuit includes a converter, an intervening circuit, an inverter, a control circuit and a lightning arrester. A power supply system is connected to the converter with the lightning arrester interposed therebetween, and the ac voltage is rectified. The intervening circuit includes a capacitor and a bypass connected in parallel thereto. In the bypass, a diode, a resister and a capacitor are connected in series, and the direction from an anode to a cathode of the diode corresponds to the direction from a high potential side to a low potential side of the smoothing capacitor.

TRANSIENT VOLTAGE BLOCKING FOR POWERCONVERTER

Overvoltage protective wiring structure for photovoltaic plants, has wires of same polarity that are connected on common varistor, and wires of same polarity with different input channels that are decoupled thought spark gap

The overvoltage protective wiring structure has the inverters (4) that are provided with several input channels. The electrical connection region is formed between the photovoltaic modules (5,6) and the direct current (DC) voltage input side of the inverter. A varistor (1,2) is connected with pole spacer wire against the ground potential. The wires of the same polarity are connected on a common varistor. The wires of the same polarity with different input channels are decoupled thought the spark gap (7-10).

Wechselrichtergerät und Verfahren zur Steuerung eines Wechselrichters mit einem Fehlerschutzsystem

Fahrzeugfahrsteuerungsvorrichtung

Wenn eine Abnormität einem Rotationselektromaschinenansteuersystem, das eine in einem mechanischen Kraftübertragungspfad zu Rädern bereitgestellte Rotationselektromaschine antreibt, aufgetreten ist, wird die Drehzahl der Rotationselektromaschine umgehend reduziert, während ein Anstieg der elektrischen Last auf das Rotationselektromaschinenansteuersystem reduziert wird, um die Zeit zu reduzieren, während der eine Evakuierungsfahrt beeinträchtigt ist. Eine Fahrzeugfahrsteuerungsvorrichtung (1), die eine Fahrzeugfahrvorrichtung (7), in der eine Brennkraftmaschine (70), eine erste Eingriffsvorrichtung (75), eine Rotationselektromaschine (80), eine zweite Eingriffsvorrichtung (95) und Räder (W) in dieser Reihenfolge in einem mechanischen Kraftübertragungspfad antriebsfähig gekoppelt sind, steuert, überführt die erste Eingriffsvorrichtung und die zweite Eingriffsvorrichtung in einen abgetrennten Zustand, wenn eine Abnormität in einem Rotationselektromaschinenansteuersystem (2) aufgetreten ist ...

Transistor oscillator surge protection circuits

... 1,025,482. Transistor inverter circuits. GLOBE INDUSTRIES Inc. Oct. 12, 1962 [Oct. 23, 1961], No. 38806/62. Heading H3T. [Also in Divisions G3 and H2] A transistor inverter of the type including a pair of push-pull transistors connected in common emitter configuration, an output transformer and a feedback transformer, is provided with a surge protection circuit connected between the common emitters and a tapping on the primary winding of the output transformer and comprising a power source connected in series with the emitter-collector path of a third transistor, biasing means for the base of the third transistor, and means controlled by the third transistor for determining the loading of the feedback transformer. As shown in Fig. 1, push-pull arranged transistors 10, 12 feed an output transformer 24 and oscillations are sustained by means of feedback resistor 34 and transformer 32, a starting network comprising resistors 50, 52 being provided between centre taps 40, 20 of transformers ...

A watchdog scheme for monitoring a power electronic inverter and determining a manner of operating a load

Operation of a power electronic inverter 188 is monitored in order to analyze a manner in which a load connected to the power electronic inverter is driven. A watchdog circuit 190 for monitoring the power inverter includes a first sub-circuit configured to generate first data corresponding to a frequency and a duration of overloading of a transistor 330, 331, 337, 338, 343, 344 in the inverter, and a second sub-circuit configured to generate second data corresponding to a rate of rise of a voltage and a peak voltage value of the transistor in the inverter. The first sub-circuit and the second sub-circuit are configured to respectively provide the first data and second data as outputs to a controller for analyzing a manner in which a load coupled to the inverter is driven. The first data may be used to determine frequency and duration of overloading the transistor and the second data may be used to determine degradation model for the transistor based on temperature. The circuit may be used ...

A watchdog scheme for monitoring a power electronic inverter and determining a manner of operating a load

DEVICE FOR THE PROTECTION OF AN INVERTER

VORRICHTUNG ZUM SCHUTZ EINES WECHSELRICHTERS

OVER-CURRENT PROTECTION DEVICE FOR A SPEED GOVERNOR

SPEED GOVERNOR A DEVICE TO THE PROTECTION AGAINST OVERVOLTAGES INCLUDING

VORRICHTUNG ZUM SCHUTZ EINES WECHSELRICHTERS

Mechanism to the overvoltage protection of steered electric rectifiers and transistors

CONSTANT CURRENT FAST CHARGING OF ELECTRIC VEHICLES VIA DC GRID USING DUAL INVERTER DRIVE

A switching circuit for controlling charging input from a DC source to at least one inverter circuit, each inverter circuit corresponding to at least one respective battery, the switching circuit is provided with a switching device which when positioned in series with the inverter circuit and the DC source, the switching device configured to control the charging input provided to the at least one respective battery, the switching device controllable in conjunction with switches in the at least one inverter circuit based on at least one voltage of the at least one respective battery.

The parallel inverter system and a shutdown control method and stop control device

sAFETY DIVICE AND MIT OF SUCH sUPPLY OF lIGHTING TUBESmORE PROVIDEDsTATIC FREQUENCY CHANGER FOR

DEVICE SAFETY Of a VARIABLE SPEED TRANSMISSION AGAINST the OVERCURRENTS.

PROCESSING CIRCUIT AND POWER SUPPLY DEVICE

A processing circuit includes a differentiation circuit configured to output a differential value of a change in a target voltage, a predetermined voltage output unit configured to output a predetermined voltage when the differential value output from the differentiation circuit is equal to or greater than a predetermined value, and a predetermined processing executor configured to execute predetermined processing based on a voltage output from the predetermined voltage output unit on a protection circuit having a function of performing protection on the basis of a current detected by a current detector.

Power conversion device and power conversion device system

Provided is a power conversion device with which it is possible to acquire a sign of a system stop before the system stops, and to minimize the nonworking time of the system. A power conversion device for converting DC voltage or AC voltage into AC voltage, the power conversion device being characterized by having an abnormality detection unit for detecting abnormalities in the power conversion device, a restart unit for stopping the power conversion device and automatically performing a restart when the abnormality detection unit has detected an abnormality, a restart recording unit for recording restart information of when the restart unit has restarted, and a sign diagnostic unit for inputting the restart information recorded by the restart recording unit and performing a sign diagnosis of the abnormality in the power conversion device on the basis of the restart information, the sign diagnostic unit performing the sign diagnosis on the basis of the number of restarts and outputting ...

SYSTEM AND METHOD FOR PROTECTING INVERTER IN VEHICLE FROM OVERVOLTAGE

A system for protecting a vehicle inverter from overvoltage includes a first inverter having switching elements and converting energy from an energy storage device into AC power. A first motor is driven by receiving the converted AC power. A second inverter is connected in parallel with the first inverter, includes a switching elements, and converts energy from the energy storage device into AC power. A second motor is driven by receiving the converted AC power. A first capacitor is connected in parallel between the first inverter and the energy storage device and stores electric energy of the first motor during regenerative braking. A controller turns off a relay connecting the energy storage device and the motor when a voltage of the first capacitor is equal to or greater than a predetermined voltage and operates the switching elements in the inverters in response to first and second current commands.

Pyro fuse with varistor control for separating an inverter from a photovoltaic assembly

The system has a photovoltaic generator having multiple serially connected photovoltaic modules (3), connected to an inverter (7) by an electrical supply line (4). A controllable pyroelectric fuse (13) having a signal input, is interconnected between the inverter and the generator. A voltage-dependant resistor (23) that is connected between the signal input of the fuse and the electrical supply line, generates a control signal that triggers the fuse responsive to the control signal and interrupts the electrical supply line.

DC ground fault detector and system-interconnected generation device using the DC ground fault detector

For detecting DC ground faults with low cost and high accuracy to ensure high safety, a zero-phase current transformer (ZCT) (41) measures a difference between DC currents flowing in plural DC power lines (39A, 39B) via a detecting core (44) and outputs a measured current signal. A temperature sensor (50) measures a temperature in the vicinity of the zero-phase current transformer (ZCT) (41) and outputs a measured temperature signal. A MPU (53) temperature-corrects the current difference corresponding to the measured current signal using the temperature corresponding to the measured temperature signal and, based on the temperature-corrected current difference, detects a ground fault caused on target conductive lines to be measure.

СПОСОБ УСТРАНЕНИЯ ЭЛЕКТРИЧЕСКОЙ ДУГИ, ОБУСЛОВЛЕННОЙ ПО МЕНЬШЕЙ МЕРЕ ОДНИМ ИСТОЧНИКОМ ФАЗНОГО НАПРЯЖЕНИЯ ВЕНТИЛЬНОГО ПРЕОБРАЗОВАТЕЛЯ ПЕРЕМЕННОГО ТОКА

1. Способ устранения электрической дуги, обусловленной работой по меньшей мере одного источника (3) фазного напряжения схемы (1) вентильного преобразователя переменного тока, при этом схема (1) вентильного преобразователя переменного тока содержит один блок (2) вентильного преобразователя переменного тока и одну цепь (4) аккумулятора энергии, причем на стороне переменного напряжения блока (2) вентильного преобразователя переменного тока подключен по меньшей мере один источник (3) фазного напряжения, а блок (2) вентильного преобразователя переменного тока содержит множество управляемых силовых полупроводниковых реле, при этом во время работы схемы (1) вентильного преобразователя переменного тока осуществляют детектирование возникающей электрической дуги и после этого замыкают накоротко по меньшей мере один источник (3) фазного напряжения, отличающийся тем, что для детектирования электрической дуги осуществляют контроль параметра состояния схемы (1) вентильного преобразователя переменного тока в отношении заданного порогового значения параметра состояния, причем при отклонении параметра состояния от заданного порогового значения управление работой по меньшей мере одной части управляемых силовых полупроводниковых реле блока (2) вентильного преобразователя переменного тока осуществляют таким образом, что образуется по меньшей мере одна цепь короткого замыкания через блок (2) вентильного преобразователя переменного тока для замыкания накоротко по меньшей мере одного источника (3) фазного напряжения.2. Способ по п. 1, отличающийся тем, что на стороне постоянного напряжения блока (2) вентильного преобразователя переменного тока подклю РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2014 127 526 A (51) МПК H02M 7/162 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ЗАЯВКА НА ИЗОБРЕТЕНИЕ (21)(22) Заявка: 2014127526, 22.11.2012 (71) Заявитель(и): АББ ТЕКНОЛОДЖИ АГ (CH) Приоритет(ы): (30) Конвенционный приоритет: 05.12.2011 EP 11191935.3 (85) Дата начала рассмотрения ...

INTEGRIERTE VORLADUNG UND ENTLADUNG FÜR KONDENSATOREN EINES ANTRIEBSSYSTEMS EINES ELEKTROFAHRZEUGS

Die vorliegende Offenbarung stellt integrierte Vorladung und Entladung für Kondensatoren eines Antriebssystems eines Elektrofahrzeugs bereit. Ein geteilter Resistor führt Vorlade- und Entladefunktionen von Kondensatoren in einem Antriebssystem eines Elektrofahrzeugs durch. In einem Vorladezustand ist der geteilte Resistor zwischen den Kondensatoren und einer DC-Quelle über ein Vorladerelais verbunden. In einem Entladezustand ist der Resistor über einen Entladetransistor über die Kondensatoren hinweg verbunden. Ansonsten ist der Resistor getrennt. Ein Überbrückungsschalter ist zwischen dem Resistor und einem Eingangskondensator verbunden. Der Überbrückungsschalter wird während des Vorladezustands und während des Entladezustands leitfähig gemacht. Der Entladetransistor wird nur während des Entladezustands aktiviert. Infolgedessen verwendet die Erfindung weniger Komponenten durch Weglassen von separaten Widerstandselementen zum Vorladen und Entladen und durch Weglassen von Entladeschaltern ...

Transistor-Wechselrichter oder -Wechselgleichrichter

Elektronische Brücken- und Halbbrückenschaltungen mit Unterdrückung von Spitzenspannungen auf der Versorgungsleitung

UEberwachungsschaltung

ARC detection and prevention in a power generation system

PROTECTIVE CIRCUIT OF THYRISTORS OF AN INVERTER IN RAIL-MOUNTED VEHICLES.

Mains overvoltage protection circuit for a regulated switched-mode power supply with a pulsed primary

The switched-mode power supply is, in particular, a welding switched-mode power supply for arc welding. The welding switched-mode power supply contains a mains rectifier 2 with a charge-storage capacitor 3, a semiconductor switching stage which is controlled via an analogue regulator 9, preferably via a pulse-width modulator 10, an invertor transformer 8, a secondary rectifier 11 and, if required, a smoothing inductor 12. The analogue regulator 9 is supplied with a nominal value signal and an actual value signal for the output current and/or the output voltage. A switch 4 is arranged in one of the connecting lines between the mains rectifier 2 and the charge-storage capacitor 3. The switch 4 is switched off by a control circuit 5 when a predetermined mains overvoltage is exceeded, and is switched on when a predetermined mains overvoltage is undershot. The switch 4 is formed from a switching transistor 14. The control circuit 5 actuates the switching transistor 14 via a driver stage 15.

CIRCUIT MECHANISM AND PROCEDURE, IN PARTICULAR FOR PHOTOVOLTAIK GENERATORS

CONSTANT CURRENT FAST CHARGING OF ELECTRIC VEHICLES VIA DC GRID USING DUAL INVERTER DRIVE

A switching circuit for controlling charging input from a DC source to at least one inverter circuit, each inverter circuit corresponding to at least one respective battery, the switching circuit is provided with a switching device which when positioned in series with the inverter circuit and the DC source, the switching device configured to control the charging input provided to the at least one respective battery, the switching device controllable in conjunction with switches in the at least one inverter circuit based on at least one voltage of the at least one respective battery.

INDUCTION HEATING APPARATUS WITH PROTECTION AGAINST POWER INTERRUPTION

According to the present invention, an induction heating apparatus comprises a rectifying circuit for rectifying an AC voltage from an AC power source, an inventor circuit for converting a DC output from the rectifying circuit to a high frequency current and supplying it to a heating coil, a circuit for detecting a fluctuation in the AC power source through a low voltage converting section coupled to the AC power source, this detecting circuit having a detection characteristic which can hold the detecting state for at least a constant time, and a controlling circuit for controlling the inventor circuit in the stopped state or driving state in accordance with the presence or absence of a detection output from the circuit for detecting the fluctuation in the AC power source voltage.

METHOD FOR ELIMINATING AN ARC DRIVEN BY MEANS OF AT LEAST ONE PHASE VOLTAGE SOURCE OF A CONVERTER CIRCUIT

The invention relates to a method for eliminating an electric arc that is driven by at least one phase voltage source (3) of an inverter circuit (1), said inverter circuit having an inverter unit (2) and an energy storage circuit (4). The at least one phase voltage source (3) is connected to the inverter unit (2) on the alternating voltage side, the inverter unit (2) having a plurality of controllable power semiconductor switches. According to said method, an electric arc produced during operation of the inverter circuit (1) is detected and the at least one phase voltage source (3) is short-circuited. In order to detect the electric arc, either a state variable of the inverter circuit (1) is monitored for a definable threshold value or alternatively the surroundings of the inverter circuit is optically monitored for the occurrence of an electric arc. If an electric arc is detected, at least part of the controllable power semiconductor switches of the inverter unit (2) is controlled such ...

Control device of electrical circuit

VARIABLE SPEED TRANSMISSION INCLUDING A DEVICE SAFETY AGAINST THE OVERCURRENTS AND OVERPRESSURES.

L'invention concerne un variateur de vitesse comportant : - en entrée, un module redresseur (12) pour générer sur un bus de puissance (10, 11) une tension continue à partir d'une tension alternative disponible sur un réseau électrique d'alimentation (A), - un condensateur de bus (Cb) connecté entre une ligne positive et une ligne négative du bus de puissance, - un module onduleur (13) alimenté par le bus de puissance et commandé pour délivrer une tension alternative à une charge électrique (2), - un dispositif de protection (14) du variateur constitué d'un premier interrupteur électronique du type transistor JFET (T1) et d'un second interrupteur électronique (T2) monté sur le bus de puissance, en parallèle du transistor JFET (T1).

SAFETY DEVICE Of a VARIABLE SPEED TRANSMISSION INCLUDING an INDUCTANCE OF FILTERING.

L'invention concerne un variateur de vitesse comportant : - un module redresseur (12) pour générer sur un bus de puissance (10, 11) une tension continue à partir d'une tension alternative disponible sur un réseau électrique d'alimentation (A), - un condensateur de bus (Cb) connecté entre une ligne positive et une ligne négative du bus de puissance, - un module onduleur (13) alimenté par le bus de puissance et commandé pour délivrer une tension alternative à une charge électrique (2), - une inductance de filtrage (L1) connectée sur la ligne positive du bus de puissance en série entre le module redresseur (12) et le condensateur de bus (Cb), - un dispositif de protection (14) du variateur contre les surintensités liées à des variations de tension sur le réseau électrique d'alimentation (A).

Protection against the abnormal transitory currents

GROUND DETECTING DEVICE FOR PHOTOVOLTAIC POWER GENERATION SYSTEM AND METHOD

PURPOSE: To exactly judge a ground state, by eliminating influence of an AC leakage current component of the electrostatic capacitance. CONSTITUTION: A differential current between the output line wires of a solar cell array 1 is detected by a current transformer 5, and the PMW component of an inverter is removed by a filter 10. Whether it is a ground state or not is judged by comparing the current which the 2fc component that is a frequency of two times of the system AC frequency is removed in a 2fc component removal circuit 15 with the required threshold value stored in a detection level setting device 21 by a comparator 20. © KIPO & JPO 2003 ...

DC GROUND FAULT DETECTOR FOR DETECTING GROUND FAULT OF DC POWER LINE AND SYSTEM-INTERCONNECTED GENERATION DEVICE FOR REGENERATING DC POWER TO COMMERCIAL POWER SYSTEM

PURPOSE: A DC ground fault detector and a system-interconnected generation device are provided to reduce the manufacturing cost by removing a temperature correction circuit and a current sensor having a small temperature drift. CONSTITUTION: A DC ground fault detector includes a zero-phase current transformer(41) for outputting a current difference between currents of a pair of DC power lines(39A,39B) in order to determine a ground fault of the DC power lines by using the current difference and a predetermined reference value. The DC ground fault detector(40) further includes a temperature sensor(50) for detecting a temperature of the zero-phase current transformer or a peripheral temperature of the zero-phase current transformer and a temperature corrector(53) for correcting the current difference of the zero-phase current transformer or the reference value by using the temperature detected from the temperature sensor. © KIPO 2005 ...

SYSTEM AND METHOD FOR OVER-VOLTAGE PROTECTION OF A PHOTOVOLTAIC STRING WITH DISTRIBUTED MAXIMUM POWER POINT TRACKING

A string over-voltage protection system and method for arrays of photovoltaic panels (205). The system and method includes a device (220) for use in a photovoltaic array power system. The device includes a voltage converter (225). The voltage converter is adapted to be coupled to a photovoltaic panel in a string (210) of photovoltaic panels. The device also includes a string over-voltage protection circuit (505). The string over-voltage protection circuit is coupled to the voltage converter. The string over-voltage protection circuit senses a string voltage and determines if a string over-voltage condition exists. Additionally, the string over-voltage protection circuit is configured to disable the voltage converter in the event of a string over-voltage condition.

SYSTEMS AND METHODS FOR POWER RIDE-THROUGH IN VARIABLE SPEED DRIVES

Systems and methods for providing ride-through for interruptions in the power supplied to drives that are used to control equipment such as downhole submersible pumps. In one embodiment, a variable speed drive includes converter and inverter sections, a capacitor bank and a control system. The drive shuts down the converter section upon detecting a disruption in the AC input power and continues to generate output power by drawing on the energy stored in the capacitor bank. When the AC input power returns (or begins to return) to normal, the drive resumes operation of the converter section in a controlled manner (e.g., by presetting the firing angle of the SCR's in the converter to match the voltage across the capacitor bank.) The drive thereby limits the current that recharges the capacitor bank and prevents sudden inrushes of current that could damage the drive.

SYSTEM AND METHOD FOR GROUND FAULT DETECTION AND INTERRUPTION

A ground fault detector and interrupter for a photovoltaic (PV) energy conversion system, method and apparatus are disclosed. In an exemplary embodiment, the system includes first and second inputs adapted to couple to a first and second rails of a PV array. An inverter is configured to convert DC power generated from the PV array to AC power. A ground fault detector and interrupter, which is coupled to the first and second rails and to the inverter, is configured to detect ground fault conditions in the PV array and to decouple the PV array from the remaining portion of the PV energy conversion system upon such detection. A known signal is coupled to the input of the ground fault detector and interrupter, and then sensed at the output of the ground fault detector and interrupter to determine whether components of the ground fault detector and interrupter are operating properly.

DIFFERENTIAL CURRENT MONITORING DEVICE WITH ARC DETECTION

The invention relates to a differential current monitoring device for monitoring differential currents in power supply systems, having a first measuring current transformer and a measuring circuit for determining the differential current and having a computing unit for evaluating the differential current and for generating a switch-off signal. The differential current monitoring device has a device for detecting arcs, the integration of which according to the invention can considerably reduce the technical effort needed to monitor the differential current, combined with the arc detection, in comparison with a functionally and spatially separate arrangement of both protective measures.

Systems and methods for power ride-through in variable speed drives

Systems and methods for providing ride-through for interruptions in the power supplied to drives that are used to control equipment such as downhole submersible pumps. In one embodiment, a variable speed drive includes converter and inverter sections, a capacitor bank and a control system. The drive shuts down the converter section upon detecting a disruption in the AC input power and continues to generate output power by drawing on the energy stored in the capacitor bank. When the AC input power returns (or begins to return) to normal, the drive resumes operation of the converter section in a controlled manner (e.g., by presetting the firing angle of the SCR's in the converter to match the voltage across the capacitor bank.) The drive thereby limits the current that recharges the capacitor bank and prevents sudden inrushes of current that could damage the drive.

Half-bridge inverter modules with advanced protection through high-side to low-side control block communication

A communication system for use in a switching module includes a low-side control block coupled to control switching of a low-side switch of the switching module. The low-side control block is further coupled to be referenced with a low-side reference system ground. A high-side control block is coupled to control switching of a high-side switch of the switching module. The high-side control block is further coupled to be referenced with a floating node of the switching module. During steady state operation, the low-side control block is coupled to send signals during each switching cycle to the high-side control block to turn the high-side switch on and off. A status update is communicated from the high-side control block to the low-side control block through a first single-wire communication link.

SYSTEMS AND METHODS FOR PROTECTING POWER CONVERSION SYSTEMS UNDER OPEN AND/OR SHORT CIRCUIT CONDITIONS

System and method are provided for protecting a power converter. The system includes a first comparator, and an off-time component. The first comparator is configured to receive a sensing signal and a first threshold signal and generate a first comparison signal based on at least information associated with the sensing signal and the first threshold signal, the power converter being associated with a switching frequency and further including a switch configured to affect the primary current. The off-time component is configured to receive the first comparison signal and generate an off-time signal based on at least information associated with the first comparison signal. The off-time component is further configured to, if the first comparison signal indicates the sensing signal to be larger than the first threshold signal in magnitude, generate the off-time signal to keep the switch to be turned off for at least a predetermined period of time.

СПОСОБ УСТРАНЕНИЯ ЭЛЕКТРИЧЕСКОЙ ДУГИ, ОБУСЛОВЛЕННОЙ ПО МЕНЬШЕЙ МЕРЕ ОДНИМ ИСТОЧНИКОМ ФАЗНОГО НАПРЯЖЕНИЯ ВЕНТИЛЬНОГО ПРЕОБРАЗОВАТЕЛЯ ПЕРЕМЕННОГО ТОКА

FIELD: electrical engineering. SUBSTANCE: invention relates to electrical engineering and can be used in power converters. Method for eliminating an electric arc that is driven by at least one phase voltage source (3) of inverter circuit (1), which comprises inverter unit (2) and energy storage circuit (4), wherein least one phase voltage source (3) is connected to inverter unit (2) on alternating voltage side, inverter unit (2) having a plurality of controllable power semiconductor relays, an electric arc produced during operation of inverter circuit (1) is detected and at least one phase voltage source (3) is short-circuited. In order to detect electric arc, either a state variable of inverter circuit (1) is monitored for a definable threshold value or alternatively surroundings of inverter circuit are optically monitored for occurrence of an electric arc. If an electric arc is detected, at least part of controllable power semiconductor relays of inverter unit (2) is controlled such that at least one short circuit path across inverter unit (2) is produced to short-circuit at least one phase voltage source (3). EFFECT: high efficiency of elimination of electric arc occurring in inverter circuit. 4 cl, 4 dwg РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 605 082 C2 (51) МПК H02M 1/32 (2007.01) H02H 7/10 (2006.01) H02H 7/122 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ (21)(22) Заявка: ИЗОБРЕТЕНИЯ К ПАТЕНТУ 2014127526/07, 22.11.2012 (24) Дата начала отсчета срока действия патента: 22.11.2012 Приоритет(ы): (30) Конвенционный приоритет: (72) Автор(ы): ГУГГИСБЕРГ Адриан (CH), ЭККЕРЛЕ Джон (CH), ВАЛЬСТРЁМ Йонас (CH) 05.12.2011 EP 11191935.3 (43) Дата публикации заявки: 10.02.2016 Бюл. № 4 R U (73) Патентообладатель(и): АББ ТЕКНОЛОДЖИ АГ (CH) (45) Опубликовано: 20.12.2016 Бюл. № 35 (85) Дата начала рассмотрения заявки PCT на национальной фазе: 07.07.2014 2 6 0 5 0 8 2 (56) Список документов, цитированных в отчете о поиске: DE 102009002684 A1, 18. ...

Schaltungsanordnung zum Anschalten eines niederfrequent schwingenden Transistor-Oszillators, insbesondere Transistorspannungsswandlers, an seine Speisestromquelle

Vorladen einer Zwischenkreiskapazität eines Gleichspannungszwischenkreises

Die Erfindung betrifft ein Verfahren zum Vorladen einer Zwischenkreiskapazität (6) eines Gleichspannungszwischenkreises (14) eines elektrisch antreibbaren Kraftfahrzeugs mit elektrischer Energie einer elektrischen Energiequelle (1), wobei die elektrische Energiequelle (1) zum Vorladen der Zwischenkreiskapazität (6) über eine Vorladeschaltung (15) mit einem elektrisch steuerbaren Element (13) mit dem Gleichspannungszwischenkreis (14) elektrisch gekoppelt wird, wobei das elektrisch steuerbare Element (13) abhängig von einer elektrischen Zwischenkreisspannung (5) des Gleichspannungszwischenkreises (14) gesteuert wird, die elektrische Zwischenkreisspannung (5) am Gleichspannungszwischenkreis (14) mit einer Referenzspannung (16) verglichen wird und, wenn die Zwischenkreisspannung (5) kleiner als die Referenzspannung (16) ist, ein Meldesignal (17) erzeugt wird.

Circuit for blocking a semiconductor switching device on overcurrent

A conventional circuit for blocking a semiconductor switching device (7) on overcurrent, the semiconductor switching device (7) having at least one continuously driven semiconductor switch (9), comprises a driver circuit (11), which has a driver stage (12) for each semiconductor switch (9), a control pulse generator (10) For producing control pulses (P 1 to P 6 ), which are fed in operation to a control input of the semiconductor switching device (7) via the driver circuit (11), and a monitoring device (34), which measures the current (I) flowing through the semiconductor switching device (7) and, when an overcurrent occurs, generates a fault signal (E), which initiates blocking of the semiconductor switching device (7). When the semiconductor switching device is being blocked, a high overvoltage can occur therein, possibly leading to destruction of the semiconductor switching device. In order to reduce, with little outlay, the overvoltage in the semiconductor switching device during blocking ...

NET OVERVOLTAGE PROTECTION CIRCUIT FOR A PRIMARYCLOCKED REGULATION COMBINATORIAL CIRCUIT EQUIPMENT

NETZ-ÜBERSPANNUNGS-SCHUTZSCHALTUNG FÜR EIN PRIMÄRGETAKTETES GEREGELTES SCHALTNETZGERÄT

INTERRUPTER DEVICE FOR INTERRUPTING A DIRECT CURRENT

The invention relates to an interrupter device (10) for interrupting a direct current between a direct-current source (2) and an electric device (6), in particular between a photovoltaic generator and an inverter. The interrupter device (10) comprises a mechanical switch (16) which has a first fixed contact (18), a second fixed contact (20), and a contact bridge (22) that can be moved between a first position (32) and a second position (34). In the first position (32), the first fixed contact (18) and the second fixed contact (20) are electrically contacted by means of the contact bridge (22), and in the second position (34), the contact bridge (22) is arranged at a distance from the first fixed contact (18) and the second fixed contact (20). The contact bridge (22) and the first fixed contact (18) are electrically contacted by a semiconductor switch (40) which blocks a current when the contact bridge (22) is in the first position (32). A control input (44) of the semiconductor switch ( ...

OVERVOLTAGE PROTECTION FOR INVERTERS THAT COMPRISE AN EMC FILTER AT THEIR INPUT END

In an over-voltage protection apparatus in front of an inverter (5) for feeding electrical energy of a DC voltage source (15) in particular into an AC network (4) having one DC voltage input stage (6) comprising at least two current-carrying lines (22 to 24) and an EMV filter (7) comprising suppression capacities (13, 14) and suppression inductions (12) is connected to the lines (22 to 24) for discharging over-voltages towards ground by way of over-voltage arrestors behind the EMV filter (7) as seen from the perspective of the DC voltage source (15).

PROTECTIVE DEVICE AGAINST SHORT CIRCUITS UPSTREAM OF A POWER MODULE

Le dispositif de protection contre des courts-circuits amont d'un module d'alimentation électrique de puissance (160, 160') comprenant un filtre d'entrée avec au moins un condensateur (106 à 108, 106' à 108') et une inductance (104, 105, 104', 105') et un convertisseur (120, 120') avec des composants associés à une pluralité de diodes de roue libre (118, 118'), comprend au moins un bobinage auxiliaire (131) et un élément dissipatif (132) associés au filtre d'entrée, ce qui permet de réaliser un filtre d'entrée de taille réduite sans sur-dimensionner les diodes de roue libre (118, 118').

Device for the protection of the ordered rectifiers and the transistors against overpressures

PROTECTION CIRCUIT AND MOTOR DRIVER WITH THE SAME

POWER CONVERSION DEVICE AND AIR CONDITIONER COMPRISING SAME

The present invention relates to a power conversion device and, more specifically, to a power conversion device including an overcurrent protection function, and an air conditioner comprising the same. To this end, the power conversion device of the present invention comprises: an inverter including at least two pairs of switching elements for generating an AC signal using power charged in a capacitor; a driving unit for driving the switching elements; an inverting unit for inverting a fault signal output when an overcurrent is sensed by the driving unit; and a control unit for simultaneously inputting top and bottom signals on each phase of the driving unit, and controlling a driving signal of the switching elements to be generated by the driving unit only when the top signal is turned on and the bottom signal is turned off through a logic gate, in order to drive the switching elements by the control unit. A fault-out signal which is obtained by receiving the fault signal by the control ...

METHOD FOR CONTROLLING INVERTER

APPARATUS, SYSTEM, AND METHOD FOR AC BUS LOSS DETECTION AND AC BUS DISCONNECTION FOR ELECTRIC VEHICLES HAVING A HOUSE KEEPING POWER SUPPLY

An alternating current (AC) bus malfunction detection and protection module monitors an AC voltage that is provided on a bus by a house keeping power supply of a power system. If the AC voltage on the bus falls below a first level, the module provides a delay before power inverter switching is disabled. If the AC voltage on the bus falls below a second level, the module disables the power inverter switching without delay.

Watchdog scheme for monitoring a power electronic inverter and determining a manner of operating a load

In one example embodiment, a circuit includes a first sub-circuit configured to generate first data corresponding to a frequency and a duration of overloading of a transistor in the inverter, and a second sub-circuit configured to generate second data corresponding to a rate of rise of a voltage and a peak voltage value of the transistor in the inverter. The first sub-circuit and the second sub-circuit are configured to respectively provide the first data and second data as outputs to a controller for analyzing a manner in which a load coupled to the inverter is driven.

Apparatus, system, and method for AC bus loss detection and AC bus disconnection for electric vehicles having a house keeping power supply

An alternating current (AC) bus malfunction detection and protection module monitors an AC voltage that is provided on a bus by a house keeping power supply of a power system. If the AC voltage on the bus falls below a first level, the module provides a delay before power inverter switching is disabled. If the AC voltage on the bus falls below a second level, the module disables the power inverter switching without delay.

Transient voltage protection circuit for a DC voltage supply

A transient voltage protection circuit for operating a lamp includes input terminals for connection to a supply voltage source which delivers a low-frequency AC voltage. A rectifier is coupled to the input terminals for rectifying the low-frequency AC voltage and has output terminals. A first branch comprising a series arrangement of a breakdown element and a first capacitor interconnects the output terminals and a second branch shunts the first capacitor for discharging the first capacitor. A further capacitor, across which a DC voltage is present during lamp operation, supplies an operating voltage to the lamp. A DC--DC converter is coupled to the output terminals and to the further capacitor and a third branch comprising a series arrangement of a diode and the further capacitor shunts the first capacitor. The DC voltage across the further capacitor does not rise or rises only slightly in the case of two voltage transients in quick succession or a transient having a comparatively high ...

Low cost current sensor for fast-switching inverter applications

The DC link current from one leg of a DC link of an inverter is provided to a primary winding of an AC current transformer, and a voltage across the secondary winding of the current transformer is integrated for providing an envelope indicative of the DC link current.

DEVICE FOR PROTECTING A SPEED CONTROLLER AGAINST OVERCURRENT

The invention relates to a speed controller comprising: a rectifier module (12) for generating a direct voltage on a power bus (10, 11) from an alternating voltage available on an electrical power-supply network (A); a bus capacitor (Cb) connected between a positive line and a negative line of the power bus; and an inverter module (13) powered by the power bus and controlled to deliver an alternating voltage to an electrical load (2); a protection device (14) for protecting the controller against overcurrents linked with voltage variations on the electrical power-supply network (A).

Driver circuit and inverter circuit

The present invention provides a safe circuit that can prevent an arm short, when a half-bridge circuit is configured by using a normally-on switching element, and the half-bridge circuit is used as a driver circuit or an inverter circuit. In a driver circuit configured by a half-bridge circuit in which one of input and output terminals of a first switching element 14 is connected to a first power-supply voltage V1 on a high-voltage side, and the first switching element 14 and a second switching element 15 are connected in series, a normally-off third switching element 16 is inserted between the second switching element 15 and a second power-supply voltage V2 on a low voltage side. The third switching element 16 is turned off, when an operating voltage VH or VL supplied from control-circuit power supplies 13a and 13b is insufficient for the operation of a control circuit 11.

METHOD FOR ELIMINATING AN ELECTRIC ARC DRIVEN BY AT LEAST ONE VOLTAGE SOURCE OF AN INVERTER CIRCUIT

ELECTRIC VEHICLE DRIVE TRAIN WITH MAIN CONTACTOR PROTECTION

Leistungsansteuervorrichtung für eine elektrische Maschine und Verfahren zum Abtrennen einer elektrischen Maschine von einem elektrischen Energiespeicher

Es wird eine Leistungsansteuervorrichtung für eine elektrische Maschine wird beschrieben. Ein Inverter (IN) ist zwischen einem Gleichspannungsanschluss (GA) und einem Wechselspannungsanschluss (WA) der elektrischen Maschine (EM) angeschlossen. Einer Steuerung (C, C1) ist eine Halbleiter-Brückenschaltung (11-23; H1-H24) des Inverters (IN) ansteuernd nachgeschaltet. Die Brückenschaltung (11-23; H1, H11, H21) weist einen ersten Halbleiterschalter (11-13; H1, H11, H21) auf, der zwischen dem Wechselspannungsanschluss (WA) und einem ersten Potential des Gleichspannungsanschlusses (GA) liegt. Ein zweiter Halbleiterschalter (S1; H3, H13, H23) der Leistungsansteuervorrichtung (LS) ist antiseriell zu dem mindestens einen ersten Halbleiterschalter (11-13; H1 - H21) und an dem ersten Potential (P; EA1) des Gleichspannungsanschlusses angeschlossen. Die Steuerung (C; C1, C2) weist einen Trennsignaleingang (FE) auf. Die Steuerung (C; C1, C2) öffnet den ersten und den zweiten Halbleiterschalter, wenn ein ...

Arc detection in a system including a photovoltaic panel

Arcs are detected in a power generation system 201 including a photovoltaic (solar) panel 200 and a load 250 connected to the photovoltaic panel with a DC power line. The power delivered to the load or the noise voltage of the load is measured to produce a first measurement result. The power produced by the panel or the noise voltage of the panel is measured to produce a first measurement result. The first measurement result is compared with the second measurement result to give a differential power measurement result. If the differential power measurement result is more than a threshold value, an alarm condition may be set. The second measurement result may be modulated and transmitted over the DC power line. The power produced by the panel may be measured by an electronic module. The power delivered to the load may be measured by a controller 204 using a sensor 206. The load may be an AC/DC or DC/DC converter. Multiple panels and electronic modules may be connected to form a serial string ...

Method and apparatus for overvoltage protection of an inverter

Aspects of the invention are directed to methods and apparatus to protect an inverter from failure due to neutral lifting. In one aspect, the present invention provides a method of controlling an inverter in a UPS, the inverter being selectively coupled to a power line and comprising an input to receive an input voltage from the power line. The method comprises acts of monitoring the input voltage, detecting based on the act of monitoring, that the input voltage exceeds a predetermined high threshold value, isolating the inverter from the power line responsive to detecting that the input voltage exceeds a predetermined high threshold value, determining whether or not a neutral lifting condition exists on the power line, indicating that the inverter is in a fault state if the neutral lifting condition exists, and reconnecting the inverter to the power line if the neutral lifting condition does not exist.

PROTECTION MEANS FOR PREVENTING OVERVOLTAGE AND UNDER- VOLTAGE CONDITIONS IN POWER CIRCUITS

POWER SPIKE MITIGATION

A method, device, and system for mitigating the effect of a power spike on a protective device. The device can receive an input signal and determine whether the input signal exceeds a threshold value. If so, the device simultaneously starts an initial time period and starts a latch time period, where the latch time period is greater than the initial time period. During the initial time period, the device replaces the input signal with a set value signal. After the initial time period ends and during the remainder of the latch time period, the device prevents the input signal from being replaced by the set value signal. If, during the remainder of the latch time period, the input signal exceeds the threshold value, a trip signal may be generated by a protective device.

VARIABLE SPEED TRANSMISSION INCLUDING A DEVICE SAFETY AGAINST THE OVERCURRENTS AND OVERPRESSURES.

APPARATUS FOR PROTECTING INVERTER

Method and arrangement for the surge protection of inverters for photovoltaic systems

The invention relates to a method and an arrangement for the surge protection of inverters for photovoltaic systems, comprising at least one surge protection device which is physically integrated in the inverter or can be found in the vicinity of the inverter. The at least one surge protection device is connected to the DC side of the inverter. According to the invention, the inverter supplies a signal for setting or tracking the operating point at an operating level in the maximum power point (MPP) range, the response voltage of the surge protection device being predetermined, set, or selected on the basis of said signal.

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

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

DRIVER CIRCUIT AND INVERTER CIRCUIT

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

MOTOR DRIVE DEVICE

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

In situ overvoltage protection for active bridge applications

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

Control circuit and motor device

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

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

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

Power source system

A power source system provides: an electrical generator including a rectifying circuit configured by one or more rectifying diodes for allowing electric conduction from a ground side to a battery side; a fuse arranged between the electrical generator and a battery; and a driving apparatus including a circuit configured by one or more semiconductor elements having one or more parasitic diodes for allowing electrical conduction from the ground side to the battery side, and a load. The number of parasitic diodes to be connected in series between a ground and the fuse in the driving apparatus is larger than the number of rectifying diodes to be connected in series between the ground and the battery side in the electrical generator. In addition, the circuit switches electrical conduction in the load.

INDICATOR USING EXISTING POWER SUPPLY CONTROLLER TERMINALS

A power conversion circuit has a controller with an input terminal and a circuit configured to drive an electric current out of the input terminal in response to a condition of the controller. An indicator is coupled to the input terminal of the controller. The controller includes a clock signal controlling the electric current out of the input terminal. The input terminal is a voltage sensing terminal or feedback input terminal in some embodiments. 1. A power conversion circuit for converting comprising:a primary side defining an input voltage, a primary winding of a transformer coupled to the input voltage, and a primary switch coupled to the primary winding;a secondary side defining an output voltage, and a secondary winding coupled to the output voltage; a brownout terminal coupled to the input voltage;', 'a feedback terminal coupled to the output voltage;', sense a voltage on the brownout terminal;', 'sense a voltage on the feedback terminal indicative of output voltage of the power conversion circuit while refraining from driving the alarm current to the feedback terminal;', 'assert an internal signal if the voltage sensed on the brownout terminal during the refraining falls outside a predetermined range; and', 'drive the alarm current to the feedback terminal responsive to the assertion of the internal signal;, 'a first circuit having a first input coupled to the feedback terminal and a second input coupled to the brownout terminal, the first circuit configured to], 'a controller comprisingan external indicator coupled feedback terminal, the external indicator configured to activate responsive to the alarm current.2. The power conversion circuit of wherein the external indicator is at least one selected from a group comprising: a light emitting diode; and a buzzer configured to produce sound audible to a human.3. The power conversion circuit of wherein the external indicator is a means for providing human perceptible visual or auditory alarm indication.4. The ...

Photovoltaic inverter

A photovoltaic inverter includes: an input unit to connected to a first terminal and a second terminal to which a positive (+) polarity or a negative (−) polarity of a photovoltaic module are connected; a switching device configured to control the first terminal and the second terminal connected to the input unit according to pre-set polarities of an inverter unit; a booster unit configured to boost a voltage of the photovoltaic module delivered form the input unit through the switching device; a capacitor configured to charge the voltage boosted by the booster unit; and an inverter unit configured to convert the voltage charged in the capacitor into an alternating current (AC) and provide the converted AC voltage for an electric power system.

Parallel inverter system, and shutdown control method and shutdown control device for parallel inverter system

Provided are a parallel inverter system, and a shutdown control method and a shutdown control device for the parallel inverter system. A shutdown instruction is determined and responded according to a level of the shutdown instruction. The shutdown instruction is determined to be an emergency shutdown instruction under certain emergency shutdown conditions, and a driving signal for the power switch devices of the inverter apparatus is needed to be instantly locked out. The shutdown instruction is determined to be a normal shutdown instruction under non-emergency shutdown conditions, a switch-off signal is transmitted to alternating-current switches connected to the inverter apparatus to be shut down, states of the alternating-current switches connected to the inverter apparatus to be shut down are detected, the driving signal for the power switch devices of the inverter apparatus to be shut down is instantly locked out in a case that the alternating-current switches are switched off.

INTERRUPTER DEVICE FOR INTERRUPTING A DIRECT CURRENT

An interrupter device for interrupting a direct current between a direct current source and an electrical device, for example, between a photovoltaic generator and an inverter. The interrupter device has a mechanical switch which has a first fixed contact, a second fixed contact, and a contact bridge that can be moved between a first position and a second position. The contact bridge and the first fixed contact are electrically contacted to a semiconductor switch which blocks a current when the contact bridge is in the first position. A control input of the semiconductor switch is connected to the mechanical switch such that an arc voltage generated as a result of an arc across the switch connects the semiconductor switch so as to conduct a current when the contact bridge is moved into the second position. 1. An interrupter device for interrupting a direct current between a direct current source and an electrical device , the interrupter device comprising:a semiconductor switch; anda mechanical switch that has a first fixed contact, a second fixed contact, and a contact bridge that is adapted to be moved between a first position and a second position, wherein in the first position, the first fixed contact and the second fixed contact are electrically contacted via the contact bridge, and in the second position, the contact bridge is spaced apart from the first fixed contact and the second fixed contact,wherein the contact bridge and the first fixed contact are electrically contacted to the semiconductor switch, which blocks current when the contact bridge is in the first position, andwherein a control input of the semiconductor switch is connected to the mechanical switch such that an arc voltage generated as a result of an arc across the switch connects the semiconductor switch so as to conduct a current when the contact bridge is moved into the second position.2. The interrupter device according to claim 1 , wherein the mechanical switch is an electromechanical ...

Power electronic converter and a method for controlling the same

A controller (203) comprises a processing system (205) for controlling a power electronic converter during a short circuit taking place in a direct voltage side of the power electronic converter. The processing system recognizes a direction of current in a phase (126-128) of an alternating voltage side of the power electronic converter, sets a high-leg controllable switch (108-110) of the phase to a conductive state while keeping a low-leg controllable switch (111-113) of the phase in a non-conductive state when the recognized direction of the current is outwards from the power electronic converter, and otherwise sets the low-leg controllable switch to the conductive state while keeping the high-leg controllable switch in the non-conductive state. Thermal loadings of freewheeling diodes (114-119) of the power electronic converter are reduced since currents needed to burn input fuses (122) of the power electronic converter are shared between the controllable switches and the freewheeling diodes.

INTEGRATED PRECHARGING AND DISCHARGING FOR ELECTRIC VEHICLE DRIVE SYSTEM CAPACITORS

A shared resistor performs precharging and discharging functions of capacitors in an electric vehicle drive system. In a precharge state, the shared resistor is connected between the capacitors and a DC source via a precharge relay. In a discharge state, the resistor is connected across the capacitors via a discharge transistor. Otherwise, the resistor is disconnected. A bypass switch is connected between the resistor and an input capacitor. The bypass switch is rendered conductive during the precharge state and during the discharge state. The discharge transistor is activated only during the discharge state. As a result, the invention uses less components by virtue of eliminating separate resistance elements for pre-charging and discharging and by eliminating discharge switches dedicated to separate resistances. The circuit integration and the placement of components outside the inverter module improves overall system cost and packaging size. 1. An electric drive system for a vehicle with a DC source , comprising:a link capacitor between a positive bus and a negative bus;a precharge contactor having an input adapted to be connected to the DC source and having an output;a resistance element connecting the precharge contactor output to the positive bus; anda discharge switch selectably connecting the negative bus to a junction between the precharge contactor and the resistance element.2. The drive system of wherein the resistance element is comprised of a fixed resistor.3. The drive system of further comprising:an input capacitor with positive and negative terminals selectably coupled to the DC source by positive and negative contactors, respectively;a variable voltage converter coupling the positive terminal to the positive bus; anda bypass switch selectably coupling the positive terminal to the positive bus; wherein in a precharge state, the precharge contactor and the bypass switch are conductive while the discharge switch and the positive contactor are ...

Half-bridge inverter modules with advanced protection through high-side to low-side control block communication

A communication system for use in a switching module includes a low-side control block coupled to control switching of a low-side switch of the switching module. The low-side control block is further coupled to be referenced with a low-side reference system ground. A high-side control block is coupled to control switching of a high-side switch of the switching module. The high-side control block is further coupled to be referenced with a floating node of the switching module. During steady state operation, the low-side control block is coupled to send signals during each switching cycle to the high-side control block to turn the high-side switch on and off. A status update is communicated from the high-side control block to the low-side control block through a first single-wire communication link.

CONTROL DEVICE FOR ELECTRIC POWER CONVERSION APPARATUS

A control device for an electric power conversion apparatus, the control device detecting occurrence of an earth fault in a direct-current path in a system in which the direct-current path between a solar cell module and an electric power conversion apparatus is grounded, is provided. The control device for the electric power conversion apparatus includes: a grounding control unit configured to, in a system in which a direct-current path between a solar cell module and an electric power conversion apparatus is grounded via a switch, control a switch; and an earth fault determination unit configured to, when the switch is open under the controlled of the grounding control unit, detect whether or not an earth fault has occurred in the direct-current path. 1. A control device for an electric power conversion apparatus , the control device comprising:a grounding control unit configured to, in a system in which a direct-current path between a solar cell module and an electric power conversion apparatus is grounded via a switch, control the switch;a direct-current voltage detection unit configured to detect a direct-current voltage output from the solar cell module; andan earth fault determination unit configured to, when the switch is open under the control of the grounding control unit, determine whether or not an earth fault has occurred in the direct-current path,wherein during a gradual decrease of the value of the direct-current voltage detected by the direct-current voltage detection unit to zero, when the direct-current voltage detection unit detects the direct-current voltage having a value that is smaller than a preset threshold value and the grounding control unit determines that a current time is a time in a period of transition from day to night based on a length of time passed from a last earth fault determination, the grounding control unit opening the switch and subsequently closing the switch before the value of the direct-current voltage detected by the ...

Control circuit for power converter

In a control circuit for controlling a power converter that includes a switch, a power supply circuit outputs electrical power, and a command generator generates a switching command that controls switching operations of the switch, based on the electrical power output from the power supply circuit. A failure mode determiner executes a determination of whether which of failure modes has occurred in the power supply circuit, and outputs a result of the determination. A switch controller selectively executes, based on the result of the determination, a first switch control task and a second switch control task. The first switch control task forcibly shuts down the switch independently of the switching command, and the second switch control task enables the switching operations of the switch to be continuously controlled based on the switching command.

Power Conversion Device and Power Conversion Device System

Provided is a power conversion device with which it is possible to acquire a sign of a system stop before the system stops, and to minimize the nonworking time of the system. A power conversion device for converting DC voltage or AC voltage into AC voltage, the power conversion device being characterized by having an abnormality detection unit for detecting abnormalities in the power conversion device, a restart unit for stopping the power conversion device and automatically performing a restart when the abnormality detection unit has detected an abnormality, a restart recording unit for recording restart information of when the restart unit has restarted, and a sign diagnostic unit for inputting the restart information recorded by the restart recording unit and performing a sign diagnosis of the abnormality in the power conversion device on the basis of the restart information, the sign diagnostic unit performing the sign diagnosis on the basis of the number of restarts and outputting a sign diagnostic result.

ARC PREVENTION IN DC POWER SYSTEMS

A power system includes a DC power source having a maximum output voltage, a DC/AC inverter having an input coupled via a connection to the DC power source and an output for supplying AC power to a load, and a control circuit for controlling the DC/AC inverter. The control circuit is configured to maintain a DC voltage at the input of the DC/AC inverter above a threshold voltage to inhibit arcing as a result of a break in the connection between the DC power source and the DC/AC inverter. The threshold voltage is substantially equal to the maximum output voltage of the DC power source less a minimum arcing voltage for the connection between the DC power source and the DC/AC inverter. 1. A power system comprising:a DC power source having a maximum output voltage;a DC/AC inverter having an input coupled via a connection to the DC power source and an output for supplying AC power to a load; anda control circuit for controlling the DC/AC inverter, the control circuit configured to maintain a DC voltage at the input of the DC/AC inverter above a threshold voltage to inhibit arcing as a result of a break in the connection between the DC power source and the DC/AC inverter;wherein the threshold voltage is substantially equal to the maximum output voltage of the DC power source less a minimum arcing voltage for the connection between the DC power source and the DC/AC inverter.2. The power system of wherein the control circuit is configured to maintain the DC voltage at the input of the DC/AC inverter at a substantially constant voltage.3. The power system of wherein the control circuit is configured to allow the DC voltage at the input of the DC/AC inverter to vary within a range defined by the threshold voltage and the maximum output voltage of the DC power source.4. The power system of wherein the DC power source includes at least one DC/DC converter having a maximum power point tracker (MPPT) claim 1 , and wherein the DC/DC converter is configured to run its MPPT when its ...

Electronic control unit and control method for the same

An electronic control unit includes: inverter circuits of first and second systems driving a multiphase motor with coil sets on a coil set basis; first and second phase potential detecting circuits detecting potentials of at least one phase of current supply paths from the inverter circuits to the coil set; and a diagnosis apparatus detecting a failure based on potentials detected by the first and second phase potential detecting circuits. Under condition that the inverter circuit of the first system turns ON the upper or lower arm switching element corresponding to one phase of the first coil set and turns OFF the other one so that the inverter circuit of the second system has a high-impedance output, when the potential detected by the second phase potential detecting circuit corresponds to an output potential of the inverter circuit of the first system, the diagnosis apparatus determines that a short-circuit failure occurs.

ELECTRIC VEHICLE

An electric vehicle includes: a main battery; an electric power converter configured to convert power to driving power of a drive motor; an auxiliary battery configured to supply power to auxiliaries; a power supply harness connecting the auxiliary battery to the auxiliaries; a step-down converter having an output end connected to the power supply harness, the step-down converter being configured to step down an output voltage of the main battery to the driving voltage of the auxiliaries; an interrupter configured to isolate the step-down converter from the power supply harness at the time when a predetermined specific abnormality has been detected; and a discharger configured to discharge a capacitor incorporated in the electric power converter, the discharger being configured to operate by receiving electric power supplied from a first power supply path which connects the output end of the step-down converter to the interrupter. 1. An electric vehicle comprising:a main battery configured to store electric power that is supplied to a drive motor;an electric power converter configured to convert direct-current power, which is supplied from the main battery, to driving power of the drive motor;an auxiliary battery configured to supply direct-current power to auxiliaries having a lower driving voltage than a driving voltage of the drive motor;a power supply harness connecting the auxiliary battery to the auxiliaries;a step-down converter having an input end connected to the main battery and an output end connected to the power supply harness, the step-down converter being configured to step down an output voltage of the main battery to the driving voltage of the auxiliaries;an interrupter configured to isolate the step-down converter from the power supply harness at the time when a predetermined specific abnormality has been detected; anda discharger configured to discharge a capacitor incorporated in the electric power converter, the discharger being configured to ...

METHODS AND SYSTEMS FOR TRANSIENT VOLTAGE PROTECTION

Protection of an electric motor drive controller from a transient voltage is described herein. The transient voltage is provided by an alternating current (AC) power line that includes a line conductor, a neutral conductor, and a ground conductor. The transient voltage protection system includes a first stage protection device coupled to an input of a rectifier of the motor drive controller. The first stage protection device is configured to suppress the transient voltage to prevent damage to the motor drive controller. The transient voltage protection system also includes a second stage protection device coupled between the rectifier and an inverter of the motor drive controller. The second stage protection device is configured to further suppress the transient voltage to prevent damage to the inverter. 1. A transient voltage protection system for conditioning power provided by an alternating current (AC) power line to an electric motor drive controller , the power line including a line conductor , a neutral conductor , and a ground conductor , said transient voltage protection system comprising:a first stage protection device coupled to an input of a rectifier of the motor drive controller, said first stage protection device configured to suppress a transient voltage input into the electric motor drive controller by the power line to prevent damage to the motor drive controller; anda second stage protection device coupled between the rectifier and an inverter of the motor drive controller, said second stage protection device configured to further suppress the transient voltage to prevent damage to the inverter.2. A system in accordance with claim 1 , wherein said first stage protection device comprises:a voltage clamping device; anda gas discharge tube coupled in series to an output of said voltage clamping device.3. A system in accordance with claim 2 , wherein said voltage clamping device comprises one of a metal oxide varistor claim 2 , a Zener diode claim 2 , ...

PASSIVE ISLANDING-TO-GRID-CONNECTED SWITCH METHOD

The present invention discloses a passive islanding to grid-connection switching method for a VSC HVDC transmission system. When the VSC HVDC transmission system in an island operation state, whether the VSC HVDC transmission system enters an grid-connection state is determined by detecting whether an overcurrent phenomenon has occurred in a converter valve-side three-phase alternating-current or a converter bridge arm current, and detecting a change status of an alternating-current side voltage. The system is controlled to switch from an island operation control mode to a grid-connection control mode. At a moment of switching, the online control mode is smoothly switched to by changing a power instruction and performing phase tracking on a current grid voltage, so that continuous operation of the system is maintained. 1. A passive islanding to grid-connection switching method for a VSC HVDC transmission system , wherein comprising the following steps:(1) when a converter station of the VSC HVDC transmission system is in a passive islanding operation state, detecting whether overcurrent occurs in a converter valve-side three-phase alternating-current or a converter bridge arm current, and setting an overcurrent constant value to n times a rated bridge arm current; if overcurrent occurs, and the overcurrent lasts for a duration t1, performing step (2); and otherwise, performing step (1) again;(2) Blocking a converter, and detecting whether an alternating-current side voltage is lower than a threshold; if the voltage is lower than the threshold and lasts for a duration t2, unlocking the converter and performing step (1) again; and otherwise, performing step (3); and(3) controlling setting of a system phase-locked loop to track a current alternating-current side voltage phase, at the same time, starting to switch a control mode, switching from a current island control mode of the converter station of the VSC HVDC transmission system to an active control mode, and ...

SCR BASED AC PRECHARGE PROTECTION

Power converters, protection systems and methods to protect a precharge circuit in which a precharge resistor voltage is indirectly monitored during a normal operating mode, and a rectifier and an inverter are selectively disabled in response to the indirectly measured precharge resistor voltage indicating a fault in a precharge circuit SCR. 1. A power conversion system , comprising:a precharge circuit to control charging of a DC bus capacitor of a DC bus circuit, the precharge circuit including a precharge input to receive an AC input signal, a precharge output to deliver an AC signal, an SCR coupled between the precharge input and the precharge output to selectively allow or prevent current flow from the precharge input to the precharge output, a diode coupled between the precharge input and the precharge output to allow current flow from the precharge output to the precharge input, and a precharge resistor coupled between the precharge input and the precharge output to control current flow from the precharge input to the precharge output when the SCR is off during a precharge operating mode;a filter circuit, including an AC input to receive an AC signal from the output of the precharge circuit;a rectifier, including a rectifier input to receive an AC input signal from an output of the filter circuit, and an output to provide a DC output signal during a normal operating mode;an inverter to convert the DC output signal to an AC output signal to deliver output power to a load during the normal operating mode; anda protection system to protect the precharge circuit, the protection system configured to indirectly monitor a precharge resistor voltage during the normal operating mode, and selectively disable the rectifier and the inverter in response to the indirectly measured precharge resistor voltage indicating a fault in the SCR.2. The power conversion system of claim 1 , wherein the protection system includes a sense circuit to indirectly sense the precharge ...

Inverter, motor control apparatus, and power steering system

An inverter includes a positive electrode terminal and a negative electrode terminal, upper-arm switching elements and lower-arm switching elements, and a voltage divider that supplies partial voltages of a voltage between the positive electrode terminal and the negative electrode terminal to a gate and a drain, respectively, of the lower-arm switching element. The lower-arm switching element includes an HEMT. In the voltage divider, the partial voltages are set to turn the lower-arm switching element off when a positive electrode and a negative electrode of a DC power supply are reversely connected to the positive electrode terminal and the negative electrode terminal, respectively.

CIRCUIT FOR TRANSFERRING POWER BETWEEN A DIRECT CURRENT LINE AND AN ALTERNATING-CURRENT LINE

A system, method, and apparatus is disclosed for interfacing and transferring power unidirectionally or bidirectionally between a direct current (DC) line and a single or multiphase alternating-current (AC) line for only half of any given phase and only a single phase at a time when polarity is matched between the DC and the AC system. A circuit with simplified, robust, and reduced-cost components perform the power conditioning and the synchronization as a system that simulates a half-wave rectifier/inverter. 1. A circuit for transferring power between a direct current (DC) line and an alternating current (AC) line having one or more AC phases , the circuit comprising: one or more switches coupled to the DC line, wherein each of the one or more switches is individually coupled to one respective phase of the one or more AC phases on the AC line; and', 'wherein the phase-selector is configured to control the one or more switches such that no more than one switch is closed when power is being transferred between the AC line and the DC line.', 'a phase-selector coupled to each of the one or more of switches; and'}], 'a polarity-matching circuit comprising2. The circuit of wherein:the phase selector is configured to couple each of the one or more switches selectively to the AC line such that no more than half of each phase, for all the one or more phases on the AC line, is communicated to the DC line.3. The circuit of wherein:the phase selector is configured to couple each of the one or more switches selectively to the AC line such that only one polarity of each phase for all the phases on the AC line is communicated to the DC line.4. The circuit of wherein:the circuit is configured as a half-wave rectifier when a DC power source powers the DC line and the DC line transfers power to the AC line; andthe circuit is configured as a half-wave inverter when the DC power source does not power the DC line and when the AC line provides power to the DC line.5. The circuit of ...

ELECTRICAL SYSTEM WITH CURRENT-CONSUMING CIRCUIT FOR DISCHARGING A CAPACITOR ASSOCIATED MOTOR VEHICLE AND METHOD

The electrical system () includes: —a capacitor (C); —an electrical power supply device (); —an electrical power receiving device (); —a current-consuming electrical circuit () designed to consume a current (i) entering via a first interface terminal (B) and exiting via a second interface terminal (B). The electrical system () being designed such that the current-consuming electrical circuit () consumes the discharge current (i) when the electrical power supply device () is connected to the terminals of the capacitor (C). 1. An electrical system comprising:a capacitor having two terminals;an electrical power supply device connected to the terminals of the capacitor;an electrical power receiving device connected to the terminals of the capacitor to receive the electrical power supplied by the electrical power supply device;a current-consuming electrical circuit having two interface terminals that are connected, respectively, to the terminals of the capacitor and being configured to consume a current entering via a first interface terminal and exiting via a second interface terminal,wherein the current-consuming electrical circuit consumes the current when the electrical power supply device is connected to the terminals of the capacitor, andwherein the current-consuming electrical circuit includes a transistor arranged such that the consumed current enters via a current input terminal of the transistor and exits via a current output terminal of the transistor, and wherein the current output terminal is connected to a control terminal of the transistor in order to stabilize the transistor.2. The electrical system as claimed in claim 1 , wherein the current-consuming electrical circuit includes a Zener diode connected between the current output terminal of the transistor and the control terminal of the transistor in order to stabilize the transistor.3. The electrical system as claimed in claim 1 , wherein the current-consuming electrical circuit includes a resistor ...

System and method for protecting inverter in vehicle from overvoltage

A system for protecting a vehicle inverter from overvoltage includes a first inverter having switching elements and converting energy from an energy storage device into AC power. A first motor is driven by receiving the converted AC power. A second inverter is connected in parallel with the first inverter, includes a switching elements, and converts energy from the energy storage device into AC power. A second motor is driven by receiving the converted AC power. A first capacitor is connected in parallel between the first inverter and the energy storage device and stores electric energy of the first motor during regenerative braking. A controller turns off a relay connecting the energy storage device and the motor when a voltage of the first capacitor is equal to or greater than a predetermined voltage and operates the switching elements in the inverters in response to first and second current commands.

Dc-dc converter for solar-linked system

According to an embodiment, disclosed is a DC-DC converter in a solar-linked system, the DC-DC converter including: an initial charging circuit which connects an inverter with a first node and is used for charging an inverter-side capacitor; an intermediate capacitor; and a switching circuit connected in parallel to the intermediate capacitor and composed of a first switch and a second switch that are connected in series, wherein the initial charging circuit applies a voltage to a first node according to a received control signal, and performs charging of a battery.

SYSTEMS AND METHODS FOR GATE DRIVER WITH FIELD-ADJUSTABLE UVLO

Systems and methods for gate driver with field-adjustable undervoltage lockout (UVLO) are disclosed. A gate driver system comprises a control circuit and a driver circuit. The driver circuit incorporates a field-adjustable UVLO, a control logic, and an inverter. The level of the field-adjustable UVLO is adjustable by an external circuit, which can be a resistor based voltage divider. By setting the UVLO level externally adjustable and by moving a reference ground to the external voltage divider, the gate driver system is able to implement gate control for various load without needing extra ground pin. 1. A gate driver system comprising: 'an external circuit comprising a reference ground, the external circuit outputs an external voltage; and', 'a control circuit outputs a control signal;'} 'an adjustable undervoltage lockout (UVLO) coupled to the external circuit for providing the reference ground to the driver circuit, the adjustable UVLO receives the external voltage and a supply voltage to generate an UVLO output signal indicating a status of supply voltage, the adjustable UVLO has an trigger point adjustably determined by the external voltage;', 'a driver circuit couples to the control circuit, the driver circuit comprisinga logic circuit receives the control signal and the adjustable UVLO output signal to generate a logic output signal;an inverter receives the logic output signal to generate a driver output for gate control, in response to the adjustable UVLO being triggered, the logic circuit decouples communication between the control signal and the driver output.2. The gate driver system of wherein the external circuit is a voltage divider coupled to a voltage source to provide the external voltage claim 1 , the supply voltage to the adjustable UVLO is provided by the voltage source.3. The gate driver system of wherein the voltage divider is a resistive voltage divider comprising at least one variable resistors such that the external voltage is adjustable.4. ...

METHOD FOR ELIMINATING AN ARC DRIVEN BY MEANS OF AT LEAST ONE PHASE VOLTAGE SOURCE OF A CONVERTER CIRCUIT

A method for eliminating an arc driven by at least one phase voltage source of a converter circuit is disclosed. The converter circuit can include a converter unit and an energy storage circuit, wherein the at least one phase voltage source can be connected on an AC voltage side of the converter unit, and the converter unit can have a plurality of actuable power semiconductor switches. The method can include monitoring a state variable of the converter circuit for a predeterminable threshold value of the state variable to detect an arc, and actuating at least one of the plurality of actuable power semiconductor switches of the converter unit upon detecting a discrepancy between the state variable and the predeterminable threshold value. 113-. (canceled)14. A method for eliminating an arc driven by at least one phase voltage source of a converter circuit , the converter circuit having a converter unit and an energy storage circuit , wherein the at least one phase voltage source is connected on an AC voltage side of the converter unit , and the energy storage circuit is connected on a DC voltage side of the converter unit , wherein the converter unit has a plurality of actuable power semiconductor switches configured to rectify AC voltage when electrical energy is flowing from the AC voltage side to the DC voltage side or to invert DC voltage when electrical energy is flowing from the DC voltage side to the AC voltage side , and wherein the plurality of actuable power semiconductor switches are thyristors , integrated gate-commutated thyristors (IGCTs) , and/or insulated-gate bipolar transistors (IGBTs) and thyristors , the method comprising:monitoring a surrounding environment of the converter circuit for an occurrence of an arc light; andactuating at least one of the plurality of actuable power semiconductor switches of the converter unit upon detecting the occurrence of the arc light, wherein the actuating of the at least one of the plurality of actuable power ...

CONVERTER SYSTEM AND WIND OR WATER POWER PLANT

A converter system with a rectifier () and at least two inverters () is described and depicted, wherein the rectifier () can be supplied with energy from an alternating current source (), the rectifier () is connected to each of the inverters () via a common direct voltage circuit () in order to supply energy to the inverters () and each inverter () can be connected to a respective electrical load () in order to supply energy to the respective electrical load (). According to the invention, a converter system that is especially reliable is realized in that a decoupling device () is arranged in at least one of the connections between the direct current circuit () and one of the inverters (), wherein the decoupling device () prevents electrical energy coming from the inverter () from being transmitted in the direction of the direct current circuit (). A wind or water power plant with a rotor is also described and presented, wherein the rotor comprises a rotor hub and at least two rotor blades and the rotor blades can be rotated about their respective longitudinal axes by electrical loads (). According to the invention, a wind or water power plant that is especially reliable is realized in that the wind or water power plant comprises a converter system according to one of the claims through wherein the converter system supplies the loads () with energy. 112-. (canceled)13. A wind or water power plant comprising:a rotor comprising a rotor hub and at least two rotor blades;each of the rotor blades orientated about a respective longitudinal axis;at least two electrical loads configured to rotate the respective rotor blades about their respective longitudinal axes;a converter system configured to supply energy to the loads;the converter system comprising a rectifier, an alternating current source and at least two inverters;the rectifier configured to be supplied with energy from the alternating current source and connected to each of the inverters via a common direct ...

SYSTEMS AND METHODS FOR PROTECTING POWER CONVERSION SYSTEMS UNDER OPEN AND/OR SHORT CIRCUIT CONDITIONS

System and method are provided for protecting a power converter. The system includes a first comparator, and an off-time component. The first comparator is configured to receive a sensing signal and a first threshold signal and generate a first comparison signal based on at least information associated with the sensing signal and the first threshold signal, the power converter being associated with a switching frequency and further including a switch configured to affect the primary current. The off-time component is configured to receive the first comparison signal and generate an off-time signal based on at least information associated with the first comparison signal. The off-time component is further configured to, if the first comparison signal indicates the sensing signal to be larger than the first threshold signal in magnitude, generate the off-time signal to keep the switch to be turned off for at least a predetermined period of time. 126.-. (canceled)27. A system for protecting a power converter , the system comprising:a detection signal generator configured to receive a first comparison signal and generate a detection signal based at least in part on the first comparison signal; in response to the first comparison signal indicating that a first input signal is smaller than a second input signal in magnitude for a first predetermined period of time, generating the detection signal to turn off a switch; and', 'in response to the first comparison signal indicating that the first input signal is not smaller than the second input signal in magnitude for the first predetermined period of time, not generating the detection signal., 'wherein the detection signal generator is further configured28. The system of wherein the first input signal is proportional to a sum of a sensing signal and an offset voltage.29. The system of wherein the offset voltage is larger than zero in magnitude and less than a forward voltage drop of an electrostatic discharge diode in ...

ALTERNATING CURRENT (AC) INVERTER AND METHOD OF CONTROLLING THE SAME

An alternating current (AC) inverter includes a converter circuit configured to convert a direct current (DC) voltage to an AC voltage, and output terminals, the converter circuit being configured to output the AC voltage to the output terminals. The AC inverter further includes a signal terminal configured to receive a signal from outside of the AC inverter, and a control circuit configured to detect an abnormality related to the AC inverter, control the converter circuit to stop conversion of the DC voltage to the AC voltage in response to detection of the abnormality, and control the converter circuit to resume conversion of DC voltage to the AC voltage in response to reception of the signal on the signal terminal. 13-. (canceled)4. An alternating current (AC) inverter comprising:a converter circuit configured to convert a direct current (DC) voltage to an AC voltage;output terminals, the converter circuit being configured to output the AC voltage to the output terminals;a signal terminal configured to receive a signal from outside of the AC inverter; and detect an abnormality related to the AC inverter;', 'control the converter circuit to stop conversion of the DC voltage to the AC voltage in response to detection of the abnormality;', 'detect, based on the signal, that the output terminals are disconnected from a load and then reconnected to the load; and', 'control the converter circuit to resume conversion of DC voltage to the AC voltage in response to detection that the output terminals are disconnected from the load and then reconnected to the load., 'a control circuit configured to5. The AC inverter of claim 4 , wherein the control circuit is further configured to detect the abnormality based on a performance of at least one among an input overvoltage protection function claim 4 , an output overcurrent protection function claim 4 , an output short-circuit protection function claim 4 , and an overheat protection function.6. The AC inverter of claim 4 , ...

Power conversion device

A power conversion circuit is provided. The power conversion circuit includes a bridge circuit connected between power input terminals, a drive circuit supplied with power from a DC power source via the power input terminals, a boost circuit for, when the DC power source is reversely connected, starting up and supplying power to a control circuit, and a reverse voltage detection circuit for detecting a reverse voltage generated when the DC power source is reversely connected.

Apparatus and method of detecting ground fault of solar power generation system

In a solar power generation system which causes a non-insulated type inverter to convert DC power generated by a solar battery into AC power and outputs the AC power to a commercial power system, in detecting a ground fault, the differential current between the output lines of the solar battery is detected, an AC leakage current component due to the capacitance to ground of the solar battery is removed from the differential current, and it is determined whether a ground fault state has occurred by comparing a current value after removal of the AC leakage current component with a predetermined threshold value. With this arrangement, a false ground fault state determination that is caused by the influence of the AC leakage current component due to the electrostatic capacitance although the DC current path can be prevented, and a ground fault state can accurately be determined.

Power transforming apparatus and air conditioner including the same

본 발명은 전력 변환 장치에 관한 것으로 특히, 과전류 보호 기능을 포함하는 전력 변환 장치 및 이를 포함하는 공기 조화기에 관한 것이다. 이러한 본 발명은, 캐패시터에 충전된 전력을 이용하여 교류 신호를 발생시키기 위한 적어도 두 쌍의 스위칭 소자를 포함하는 인버터; 상기 스위칭 소자를 구동하는 구동부; 상기 구동부에서 과전류 감지시 출력되는 Fault 신호를 반전하는 반전부; 및 상기 제어부에서 상기 스위칭 소자를 구동하기 위하여, 상기 구동부의 각 상에 Top 신호와 Bottom 신호를 동시에 입력하고, 논리 게이트를 통하여 Top 신호가 온(On) 및 Bottom 신호가 오프(Off) 인 경우에만 상기 구동부에서 상기 스위칭 소자의 구동 신호가 발생하도록 제어하는 제어부를 포함하고, 상기 제어부에서 상기 Fault 신호를 수신하여 상기 반전부에서 반전된 Fault out 신호는 상기 구동부의 Bottom 신호로 동시에 입력될 수 있다. The present invention relates to a power conversion apparatus, and more particularly, to a power conversion apparatus including an overcurrent protection function and an air conditioner including the power conversion apparatus. This invention comprises an inverter comprising at least two pairs of switching elements for generating alternating current signals using electric power charged in a capacitor; A driving unit for driving the switching device; An inverting unit for inverting a fault signal output from the driving unit when an overcurrent is sensed; And a controller for simultaneously receiving a top signal and a bottom signal on each of the phases of the driving unit to drive the switching device in the control unit and only when the top signal is on and the bottom signal is off through the logic gate, And a control unit for controlling the driving unit to generate a driving signal of the switching element. The fault out signal received by the control unit and inverted by the inverting unit may be input simultaneously to the bottom signal of the driving unit.

Power converting apparatus and home appliance including the same

본 발명의 실시예에 따른 전력 변환 장치 및 홈 어플라이언스는, 인터리브 컨버터, 인터리브 컨버터의 출력단에 접속되는 dc단 커패시터, dc단 커패시터에 직렬로 연결되는 전류 감지부, 및, 전류 감지부에서 감지되는 전류 데이터에 기초하여, 인터리브 컨버터를 제어하는 제어부를 포함할 수 있다. The power conversion apparatus and the home appliance according to an embodiment of the present invention include an interleaved converter, a dc terminal capacitor connected to the output terminal of the interleaved converter, a current sensing unit connected in series to the dc terminal capacitor, and a current sensed by the current sensing unit Based on the data, a control unit for controlling the interleaved converter may be included.

Novel solid-state relay aiming at running direction control of three-phase alternating current motor and method

本发明公开了一种新型的针对三相交流电机运行方向控制的固态继电器，包括驱动模块、功率组件模块、相序检测模块、缺相检测模块、自动纠相与缺相保护逻辑模块。相序检测模块：输入端与三相电源连接，其输出端与自动纠相与缺相保护逻辑模块连接；用于检测三相电源供电的相序，并提供相序信号给自动纠相与缺相保护逻辑模块。缺相检测模块：输入端与三相电源连接，其输出端与自动纠相与缺相保护逻辑模块连接；用于三相电源供电时是否出现缺相，并提供缺相信号给自动纠相与缺相保护逻辑模块。自动纠相与缺相保护逻辑模块，包括：信号转换单元：与信号处理单元连接；信号处理单元：分别与相序检测模块的输出端、缺相检测模块的输出端以及驱动模块连接。

Island-to-network switching method

Interrupt device for interrupting direct current

본 발명은 직류-전류 소스(2)와 전기 디바이스(6) 사이, 특히 광 발전기와 인버터 사이의 직류를 인터럽팅하기 위한 인터럽터 디바이스(10)에 관한 것이다. 인터럽터 디바이스(10)는 제1 고정 콘택(18), 제2 고정 콘택(20), 및 제1 포지션(32)과 제2 포지션(34) 사이에서 이동될 수 있는 콘택 브리지(22)를 가진 기계적 스위치(16)를 포함한다. 제1 포지션(32)에서, 제1 고정 콘택(18) 및 제2 고정 콘택(20)은 콘택 브리지(22)에 의해 전기적으로 콘택팅되고, 제2 포지션(34)에서, 콘택 브리지(22)는 제1 고정 콘택(18)과 제2 고정 콘택(20)으로부터 멀리 떨어져 배열된다. 콘택 브리지(22)가 제1 포지션(32)에 있을 때, 콘택 브리지(22)와 제1 고정 콘택(18)은 반도체 스위치(40)에 전기적으로 콘택팅되어 전류를 차단한다. 콘택 브리지(22)가 제2 포지션(34)으로 이동될 때, 반도체 스위치(40)의 제어 입력(44)은, 전류를 전도시키기 위해, 스위치(16)를 가로지르는 아크(60)의 결과로서 생성된 아크 전압(64)이 반도체 스위치(40)에 연결되도록, 기계적 스위치(16)에 연결된다. The present invention relates to an interrupter device (10) for interrupting direct current between a direct current-current source (2) and an electrical device (6), in particular between a photoelectric generator and an inverter. The interrupter device 10 is mechanical with a first fixed contact 18, a second fixed contact 20, and a contact bridge 22 that can be moved between the first and second positions 32 and 34. Includes switch 16. In the first position 32, the first fixed contact 18 and the second fixed contact 20 are electrically contacted by the contact bridge 22, and in the second position 34, the contact bridge 22 Is arranged away from the first fixed contact 18 and the second fixed contact 20. When the contact bridge 22 is in the first position 32, the contact bridge 22 and the first fixed contact 18 are electrically contacted to the semiconductor switch 40 to block current. When the contact bridge 22 is moved to the second position 34, the control input 44 of the semiconductor switch 40, as a result of the arc 60 across the switch 16, to conduct current. The generated arc voltage 64 is connected to the mechanical switch 16 such that it is connected to the semiconductor switch 40.

Over current protection circuit in DC/AC inverter

본 발명은 직류/교류 인버터 과전류 보호 장치에 관한 것으로서, 과전류 감지 시에 직접적으로 최종 출력단인 H-브리지 스위칭을 정지시키고 아울러 MCU로 하여금 H-브리지 PWM 신호 출력을 정지시키도록 하는 특징을 가진다. 이를 위하여 본 발명은, H-브리지의 스위칭 소자의 출력단에 연결되어 과전류 출력 여부를 감지하여 과전류 감지 신호를 출력하는 과전류 검출부와, 과전류 감지 신호를 인가받아 과전류 검출 시에 H-브리지 스위칭부의 동작을 정지시키는 구동차단 신호를 출력하는 과전류차단 구동부와, 상기 과전류차단 구동부의 구동차단 신호를 입력받아 상기 H-브리지 스위칭부에 인가되는 H-브리지 PWM신호를 내부 그라운드로 흘려보냄으로써, 상기 H-브리지 스위칭부의 동작을 정지시키는 스위칭 제어부를 포함한다. The present invention relates to a DC / AC inverter overcurrent protection device, and has a feature of directly stopping the H-bridge switching, which is the final output stage, when the overcurrent is sensed, and causing the MCU to stop the H-bridge PWM signal output. To this end, the present invention is connected to the output terminal of the switching element of the H-bridge senses whether the output of the over-current outputs the over-current detection signal, and receives the over-current detection signal to operate the H-bridge switching unit when the over-current detection The H-bridge by outputting an over-current blocking driver for outputting a drive blocking signal to stop and a H-bridge PWM signal applied to the H-bridge switching unit by receiving a drive blocking signal of the over-current blocking driver; It includes a switching control unit for stopping the operation of the switching unit. 인버터, DC, AC, 과전류, 트랜지스터, FET, H-브리지, 트랜스포머, 보호 Inverter, DC, AC, Overcurrent, Transistors, FETs, H-Bridge, Transformers, Protection

Power transforming apparatus and air conditioner including the same

본 발명은 전력 변환 장치에 관한 것으로 특히, 과전류 보호 동작 작동시 오감지를 방지할 수 있는 전력 변환 장치 및 이를 포함하는 공기 조화기에 관한 것이다. 이러한 본 발명은, 모터를 구동하기 위한 3상 교류 전류를 생성하는 다수의 스위칭 소자를 포함하는 인버터; 상기 인버터의 전류를 감지하는 전류 검출부; 상기 인버터의 다수의 스위칭 소자를 구동하고, 입력 단자로부터 상기 전류 검출부를 통하여 과전류에 따른 신호가 감지될 때 출력 단자에서 오류 신호를 발생하는 게이트 구동부; 상기 게이트 구동부를 제어하고, 상기 게이트 구동부의 출력 단자에서 발생한 오류 신호를 수신하는 제어부; 및 상기 전류 검출부와 상기 제어부 사이에 연결되어 상기 오류 신호 발생 시 실제 과전류 발생 여부를 판단하여 상기 제어부로 과전류 발생 여부에 따른 신호를 출력하는 오감지 방지부를 포함하여 구성될 수 있다. The present invention relates to a power conversion device, and more particularly, to an electric power conversion device and an air conditioner including the same, which can prevent false senses during operation of the overcurrent protection operation. The present invention, an inverter including a plurality of switching elements for generating a three-phase alternating current for driving a motor; A current detection unit for sensing the current of the inverter; A gate driver for driving a plurality of switching elements of the inverter and generating an error signal at an output terminal when a signal according to an overcurrent is detected from the input terminal through the current detector; A control unit controlling the gate driver and receiving an error signal generated at an output terminal of the gate driver; And a false detection prevention unit connected between the current detection unit and the control unit to determine whether an actual overcurrent is generated when the error signal is generated, and output a signal according to whether an overcurrent is generated to the control unit.

Switching mode power supply

본 발명은, 입력 전압을 제공하는 입력 회로 및 입력 회로를 통전 또는 차단하는 반도체 스위치를 포함하는 1차측 회로부와, 1차측 회로부와 연결되는 1차 권선 및 1차 권선과 자기적으로 접속되는 복수의 2차 권선을 포함하는 변압기와, 복수의 2차 권선과 각각 연결되어 복수의 출력 전압을 공급하는 복수의 2차측 회로부와, 복수의 출력 전압 중 어느 하나를 피드백 받아 출력 전압을 일정하게 제어하기 위한 보상 전압을 산출하는 피드백 회로부와, 보상 전압에 따라 반도체 스위치의 온오프 듀티비를 제어하는 제어부와, 복수의 출력 전압 중 어느 하나를 피드백 받아 피드백 회로부의 고장 유무를 판단하고, 피드백 회로부 고장 시 상기 제어부의 전원을 차단하는 보호 회로부를 포함하는 스위칭 모드 전력 공급 장치를 제공한다. The present invention provides a primary circuit part including an input circuit providing an input voltage and a semiconductor switch for energizing or blocking the input circuit, a primary winding connected to the primary circuit part, and a plurality of magnetically connected to the primary winding A transformer including a secondary winding, a plurality of secondary-side circuit units respectively connected to the plurality of secondary windings to supply a plurality of output voltages, and receiving feedback from any one of the plurality of output voltages to constantly control the output voltage A feedback circuit unit for calculating a compensation voltage, a control unit for controlling the on/off duty ratio of the semiconductor switch according to the compensation voltage, and receiving any one of a plurality of output voltages as feedback to determine whether the feedback circuit unit is faulty, and when the feedback circuit unit fails, the Provided is a switched mode power supply including a protection circuit unit that cuts off power of a control unit.

Electric vehicle drive train with contactor protection

A drive train for an electric vehicle includes a traction battery, a power drive circuit, a main contactor for connecting and disconnecting the traction battery and the power drive circuit, a voltage detector across contacts of the main contactor, and a controller for controlling the main contactor to prevent movement of its contacts to the closed position when the voltage across the contacts exceeds a predetermined threshold, to thereby protect the contacts of the contactor. The power drive circuit includes an electric traction motor and a DC-to-AC inverter with a capacitive input filter. The controller also inhibits the power drive circuit from driving the motor and thereby discharging the input capacitor if the contacts are inadvertently opened during motoring. A precharging contactor is controlled to charge the input filter capacitor prior to closing the main contactor to further protect the contacts of the main contactor.

Converting device and method for its protection against short circuit

FIELD: electrical engineering.SUBSTANCE: invention relates to electrical engineering, in particular to converter device (1), and is intended to increase the reliability of its operation by improving the protection of the converter device against a short circuit. Converter device comprises first branch (8) of a phase module with first series circuit of bipolar submodules (14), which include, respectively, at least one energy storage device and at least one power semiconductor switch, moreover, the first branch of the phase module passes between first output (2) of the alternating voltage and first pole (51) of the constant voltage, second branch (9) of the phase module with a second series circuit of the bipolar submodules, which runs between the first output of the alternating voltage and second pole (61) of constant voltage, third branch (10) of the phase module with a third series circuit of bipolar submodules, which passes between the second output of the alternating voltage and the first pole of the constant voltage, and fourth branch (11) of the phase module with a fourth series circuit of a bipolar submodule, which passes between the second alternating output and the second pole of direct voltage, each submodule can be bridged by means of shunt unit (33) located parallel to its connecting terminals irrespective of the direction of the current, and wherein first pole (51) of the constant voltage is connected to the first constant voltage output (5) and second pole (61) of the constant voltage is connected to second output (6) of the constant voltage.EFFECT: invention is characterized by constant voltage switch (16) which is located between one of the constant voltage poles and the corresponding constant voltage terminal, and free-wheeling circuit (22) that passes between the two constant voltage terminals and contains a semiconductor element with the direction of locking and transmission.8 cl, 3 dwg РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 683 956 C1 (51) МПК ...

Method of switching passive section to connection to power system

FIELD: electrical equipment. SUBSTANCE: invention relates to electrical equipment. When the HVDC-AC transmission system is operated, its transition to the state of connection to the power system is determined by detecting the occurrence of an overload condition on the three-phase alternating current on the valve side of the converter or current on the arm of the bridge of the converter and by detecting a change in the state of the voltage on the AC side. System switches from the isolated operation mode to the power connection control mode. At the moment of switching, the network control mode is smoothly switched by changing the power command and monitoring the running phase at the current voltage of the power grid in order to maintain a constant operation. EFFECT: technical result consists in providing an accurate and smooth switching of the adaptive DC transmission system from the isolated work state to the network operation state and is achieved through the use of the method of switching from passive partitioning to connecting to the power system for the HVDC-AC transmission system. 6 cl, 4 dwg РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 674 167 C2 (51) МПК H02J 3/36 (2006.01) H02H 7/122 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (52) СПК H02J 3/36 (2006.01); H02J 3/38 (2006.01); H02H 7/1222 (2006.01) (21)(22) Заявка: 2017118086, 09.12.2015 (24) Дата начала отсчета срока действия патента: Дата регистрации: 05.12.2018 23.12.2014 CN 201410812231.2 (43) Дата публикации заявки: 26.11.2018 Бюл. № 33 (45) Опубликовано: 05.12.2018 Бюл. № 34 (56) Список документов, цитированных в отчете о поиске: CN 102403537 A, 04.04.2012. CN (85) Дата начала рассмотрения заявки PCT на национальной фазе: 24.05.2017 103647286 A, 19.03.2014. RU 2089986 C1, 10.09.1997. US 2014103727 A1, 17.04.2014. (86) Заявка PCT: C 2 C 2 (73) Патентообладатель(и): НР ЭЛЕКТРИК КО., ЛТД. (CN), НР ЭЛЕКТРИК ИНЖИНИРИНГ КО., ЛТД. (CN) CN 2015/096747 (09.12. ...

Power transforming apparatus and air conditioner including the same

본 발명은 전력 변환 장치에 관한 것으로 특히, 인버터를 포함하는 전력 변환 장치 및 이를 포함하는 공기 조화기에 관한 것이다. 이러한 본 발명은, 스위칭 소자를 포함하는 삼상 교류 신호를 발생하는 인버터; 상기 인버터의 스위칭 소자를 구동하며 과전류 보호 기능을 포함하는 구동부; 및 상기 삼상을 이루는 스위칭 소자의 각 상에 연결되어 상기 스위칭 소자에 흐르는 음의 전류를 반전하여 상기 구동부에 전달함으로써 상기 과전류 보호 기능이 작동하도록 하는 소자 보호부를 포함하여 구성될 수 있다. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power conversion apparatus, and more particularly, to a power conversion apparatus including an inverter and an air conditioner including the same. The present invention includes an inverter for generating a three-phase AC signal including a switching element; A driving unit driving the switching device of the inverter and including an overcurrent protection function; And a device protection unit connected to each phase of the three-phase switching device to reverse the negative current flowing to the switching device and to transmit the negative current to the driving unit to operate the overcurrent protection function.

Smps having low voltage protection circuit

PURPOSE: A SMPS(switching mode power supply) having a low voltage protection circuit is provided to protect a SMPS and circuit components from the over current caused by the low AC input voltage by including simple configuration protection circuit. CONSTITUTION: A SMPS having a low voltage protection circuit comprises a first rectification and smoothing circuit, a driving power, a PWM controller, a switching transistor, a switching transformer, a second rectification and smoothing circuit, a third rectification and smoothing circuit, a constant voltage circuit, a protection circuit(80,90) for being applied the output voltage of the first rectification and smoothing circuit and controlling not to drive the driving power if the output voltage of the first rectification and smoothing circuit is less than the set value, an input rectification and smoothing unit(10) for smoothing and rectifying the input AC voltage, a first voltage detecting unit for outputting a reset signal if the output voltage of the input rectification and smoothing unit is less than the set value, a constant controller for outputting a control signal to increase the output voltage of the constant voltage unit on applying the reset signal, and a feedback controller.

Arc detection and prevention in a power generation system

A method for arc detection in a system including a photovoltaic panel and a load connectible to the photovoltaic panel with a DC power line. The method measures power delivered to the load thereby producing a first measurement result of the power delivered to the load. Power produced by the photovoltaic panel is also measured, thereby producing a second measurement result of power produced by the photovoltaic panel. The first measurement result is compared with the second measurement result thereby producing a differential power measurement result. Upon the differential power measurement result being more than a threshold value, an alarm condition may also be set. The second measurement result may be modulated and transmitted over the DC power line.

Arc detection and prevention in a power generation system

A method for arc detection in a system including a photovoltaic panel and a load connectible to the photovoltaic panel with a DC power line. The method measures power delivered to the load thereby producing a first measurement result of the power delivered to the load. Power produced by the photovoltaic panel is also measured, thereby producing a second measurement result of power produced by the photovoltaic panel. The first measurement result is compared with the second measurement result thereby producing a differential power measurement result. Upon the differential power measurement result being more than a threshold value, an alarm condition may also be set. The second measurement result may be modulated and transmitted over the DC power line.

Arc detection and prevention in a power generation system

A method for arc detection in a system including a photovoltaic panel and a load connectible to the photovoltaic panel with a DC power line. The method measures power delivered to the load thereby producing a first measurement result of the power delivered to the load. Power produced by the photovoltaic panel is also measured, thereby producing a second measurement result of power produced by the photovoltaic panel. The first measurement result is compared with the second measurement result thereby producing a differential power measurement result. Upon the differential power measurement result being more than a threshold value, an alarm condition may also be set. The second measurement result may be modulated and transmitted over the DC power line.

Pre-charging circuit of inverter

인버터의 초기충전회로가 개시된다. 본 발명의 초기충전회로는, 정류부의 출력단과 DC-링크 커패시터의 입력단 사이에 배치되는 릴레이와, 정류부의 출력단과 인버터부의 입력단 사이에 배치되는 초기충전저항을 포함하여, PCB 설계의 자유도를 확보한다.

Arc detection and prevention in a power generation system

A method for arc detection in a system including a photovoltaic panel and a load connectible to the photovoltaic panel with a DC power line. The method measures power delivered to the load thereby producing a first measurement result of the power delivered to the load. Power produced by the photovoltaic panel is also measured, thereby producing a second measurement result of power produced by the photovoltaic panel. The first measurement result is compared with the second measurement result thereby producing a differential power measurement result. Upon the differential power measurement result being more than a threshold value, an alarm condition may also be set. The second measurement result may be modulated and transmitted over the DC power line.

System and method for protecting inverter in vehicle from overvoltage

본 발명에 따른 차량 내의 인버터를 과전압으로부터 보호하는 시스템은, 복수의 스위칭 소자를 포함하며, 에너지 저장장치로부터 제공된 에너지를 교류전력으로 변환하는 제1 인버터; 상기 제1 인버터에서 변환된 교류 전력을 제공받아 구동되는 제1 모터; 상기 제1 인버터와 병렬 연결되고, 복수의 스위칭 소자를 포함하며, 에너지 저장장치로부터 제공된 에너지를 교류전력으로 변환하는 제2 인버터; 상기 제2 인버터에서 변환된 교류 전력을 제공받아 구동되는 제2 모터; 상기 제1 인버터 및 상기 에너지저장장치 사이에 병렬로 연결되며, 회생 제동시 상기 제1 모터의 전기 에너지가 저장되는 제1 커패시터; 및 전압 센서에서 측정된 상기 제1 커패시터의 전압이 기 설정된 제1 전압 이상인 경우, 상기 에너지 저장장치와 상기 모터를 연결하는 릴레이를 오프시키고, 기 저장된 각 모터에 제로벡터가 인가되도록 하는 제1 전류 지령(1_Id*, 1_Iq*) 및 각 모터에 제로토크가 발생되도록 하는 제2 전류지령(2_Id*, 2_Iq*)에 응답하여 상기 제1 인버터 및 상기 제2 인버터 내의 스위칭 소자를 동작시키는 컨트롤러;를 포함할 수 있다.

Converter arrangement and method for short-circuit protection thereof

Input over voltage protection of power conversion systems

본 발명은 교류 전동기 드라이버 등 각종 전력변환시스템에 관한 것으로, 특히 입력정격전압보다 큰 전압이 인가된 경우, 전력변환시스템 내부의 각종 소자를 보호할 수 있게 하는 것을 목적으로 한다. 이를 위해 본 발명은 컨버터로부터 전원 투입 시 돌입 전류의 유입을 방지하는 초기 기동스위치와; 상기 돌입 전류가 억제된 후 초기 기동스위치를 회로에서 분리하는 전자 접촉기와; 상기 초기 기동스위치에 연결되어 필터 콘덴서의 회생 에너지를 제동저항으로 소비시키는 제동장치와; 상기 제동장치에 연결되어 상기 컨버터의 직류전압을 평활시키는 직류 리액터 및 필터 콘덴서와; 과전압 유입시 상기 초기 기동스위치와 제동장치의 게이트의 턴온 비율을 제어하여 상기 필터 콘덴서의 전압을 조절하는 V/f PWM 제어기를 포함하여 구성된 것을 특징으로 한다. 따라서, 본 발명은 사용자의 실수로 전력변환시스템의 입력정격전압보다 높은 전압을 인가하는 경우에 기동스위치의 턴온 비율을 조정하여 많은 비용을 들이지 않고 정류회로의 신뢰성을 높이는 효과가 있다.

High voltage inverter and electric compressor for vehicle with it

본 발명의 고전압 인버터는, 고전압 직류 입력단에 배치된 입력단 축전 소자; 상기 고전압 직류 입력단에서 공급되는 직류 전원을 3상 교류 전원으로 스위칭하는 파워부; 및 상기 고전압 직류 입력단에서 구동 전력을 인가받으며, 상기 파워부의 스위칭 동작을 제어하되, 상기 파워부의 이상 여부를 감지하여, 이상이 발생되면 상기 파워부 또는 상기 입력단 축전 소자로의 전력 공급을 차단하는 제어부를 포함할 수 있다. The high voltage inverter of the present invention comprises: an input terminal power storage element disposed at a high voltage DC input terminal; A power unit for switching the DC power supplied from the high voltage DC input terminal to a three-phase AC power source; And a control unit that receives driving power from the high-voltage DC input terminal and controls the switching operation of the power unit, detects whether the power unit is abnormal, and cuts off the power supply to the power unit or the power storage element when the abnormality occurs. It may include.

Island-to-network switching method

본 발명은 플렉시블 직류 송전 시스템의 섬에서 계통 연계로 스위칭하는 방법에 관한 것으로서, 섬 운행 하에 있는 플렉시블 직류 송전 시스템은 컨버터 밸브 측 3상 교류 전류 또는 컨버터 브릿지 암 전류에 과전류 현상이 나타났는지 여부를 검출하고, 및 교류 측 전압 변화 상황을 검출하여 플렉시블 직류 송전 시스템이 계통 연계 상태로 진입했는지 여부를 판단하고, 컨트롤 시스템은 섬 운행 컨트롤 방식에서 계통 연계 컨트롤 방식으로 스위칭하고, 스위칭 순간에 전력 지령 변화 및 현재 전력망 전압 위상 추적 방식을 통해 계통 연계 컨트롤 방식으로 안정적으로 스위칭함으로써 시스템의 지속적인 운행을 유지한다. The present invention relates to a method for switching from island to grid connection of a flexible DC transmission system, wherein a flexible DC transmission system under an island drive detects whether an overcurrent phenomenon has occurred in a three-phase alternating current or converter bridge arm current on a converter valve side And the control system determines whether or not the flexible direct current power transmission system has entered the grid connection state by detecting the AC side voltage change situation and switches the control system from the island operation control system to the grid connection control system, Current grid voltage phase tracking system maintains stable operation of system by stable switching by grid connection control method.

Fuse for disconnecting an inverter from a photovoltaic generator

A photovoltaic system includes an inverter, a photovoltaic generator with a plurality of serially connected photovoltaic modules, said photovoltaic generator connected to the inverter by an electrical supply line, a controllable fuse interconnected in the electrical supply line between the inverter and the photovoltaic generator and having a signal input, and a voltage-dependent resistor connected between the signal input of the controllable fuse and the electrical supply line and generating a control signal which triggers the controllable fuse responsive to the control signal and interrupts the electrical supply line. The controllable fuse can be used to disconnect the electrical connection of the photovoltaic system to the inverter when a switch short-circuiting one or more modules of the photovoltaic generator malfunctions. The arrangement permits operation of photovoltaic system at an operating voltage of close to 1000 V, thereby allowing use of thinner cables.

Fuse for disconnecting an inverter from a photovoltaic generator

A photovoltaic system includes an inverter, a photovoltaic generator with a plurality of serially connected photovoltaic modules, said photovoltaic generator connected to the inverter by an electrical supply line, a controllable fuse interconnected in the electrical supply line between the inverter and the photovoltaic generator and having a signal input, and a voltage-dependent resistor connected between the signal input of the controllable fuse and the electrical supply line and generating a control signal which triggers the controllable fuse responsive to the control signal and interrupts the electrical supply line. The controllable fuse can be used to disconnect the electrical connection of the photovoltaic system to the inverter when a switch short-circuiting one or more modules of the photovoltaic generator malfunctions. The arrangement permits operation of photovoltaic system at an operating voltage of close to 1000 V, thereby allowing use of thinner cables.

Pyrosicherung with Varistoransteuerung for separating an inverter from a photovoltaic system

Es wird ein Photovoltaikgenerator vorgeschlagen, der mit mindestens einem Strang (1) von mehreren, in Reihe geschalteter Photovoltaikmodulen (3), die jeweils eine Vielzahl von in Reihe geschalteter Photovoltaikzellen aufweisen, versehen ist. Vorzugsweise ist mindestens eines der Photovoltaikmodule (3) des mindestens einen Strangs (1) über einen Schalter (11) kurzschließbar. Die Aktivierung des Schalters (11) erfolgt bei Überschreitung eines vorgegebenen Spannungswertes über dem Strang (1). Erfindungsgemäß ist eine schaltbare Sicherung (13) vorgesehen, die insbesondere bei einem Versagen des Schalters (11) die elektrische Verbindung der Photovoltaikanlage zum Wechselrichter (7) trennt. Die Anordnung ermöglicht den Betrieb von Photovoltaikanlagen (1) mit einer Betriebsspannung nahe 1000 Volt, was die Verwendung dünnerer Kabel zur Folge hat. A photovoltaic generator is proposed which is provided with at least one string (1) of several photovoltaic modules (3) connected in series, each of which has a plurality of photovoltaic cells connected in series. At least one of the photovoltaic modules (3) of the at least one string (1) can preferably be short-circuited via a switch (11). The switch (11) is activated when a specified voltage value is exceeded across the strand (1). According to the invention, a switchable fuse (13) is provided which, in particular if the switch (11) fails, separates the electrical connection between the photovoltaic system and the inverter (7). The arrangement enables the operation of photovoltaic systems (1) with an operating voltage close to 1000 volts, which means that thinner cables are used.

Photovoltaic system with a fuse for disconnecting an inverter from a photovoltaic generator

Es wird ein Photovoltaikgenerator vorgeschlagen, der mit mindestens einem Strang (1) von mehreren, in Reihe geschalteter Photovoltaikmodulen (3), die jeweils eine Vielzahl von in Reihe geschalteter Photovoltaikzellen aufweisen, versehen ist. Vorzugsweise ist mindestens eines der Photovoltaikmodule (3) des mindestens einen Strangs (1) ist über einen Schalter (11) kurzschließbar. Die Aktivierung des Schalters (11) erfolgt bei Überschreitung eines vorgegebenen Spannungswertes über dem Strang (1). Erfindungsgemäß ist eine schaltbare Sicherung (13) vorgesehen, die insbesondere bei einem Versagen des Schalters (11) die elektrische Verbindung der Photovoltaikanlage zum Wechselrichter (7) trennt. Die Anordnung ermöglicht den Betrieb von Photovoltaikanlagen (1) mit einer Betriebsspannung nahe 1000 Volt, was die Verwendung dünnerer Kabel zur Folge hat. The invention relates to a photovoltaic generator which is provided with at least one string (1) of a plurality of photovoltaic modules (3) connected in series, each of which has a large number of photovoltaic cells connected in series. At least one of the photovoltaic modules (3) of the at least one string (1) can preferably be short-circuited via a switch (11). The switch (11) is activated when a predetermined voltage value across the strand (1) is exceeded. According to the invention, a switchable fuse (13) is provided which disconnects the electrical connection of the photovoltaic system to the inverter (7), in particular if the switch (11) fails. The arrangement enables the operation of photovoltaic systems (1) with an operating voltage close to 1000 volts, which results in the use of thinner cables.

Inverter system and pv system

The invention relates to an inverter system (7), wherein an inverter unit (2) is separated on the AC side when an arc detection device (6) detects an arc.

Circuit configuration with an inverter

Apparatus for controlling inverter

인버터 제어장치가 개시된다. 본 발명의 장치는, 인버터의 지령상실 판단동작을 위한 파라미터를 저장하는 저장부와, 인버터의 지령상실을 판단하고, 파라미터에 의해 인버터를 연속운전하도록 PWM 제어부에 운전지령 및 주파수지령을 제공하는 제어부를 포함한다. An inverter control device is disclosed. The apparatus of the present invention includes a storage unit for storing parameters for a command loss determination operation of the inverter, and a control unit for determining a command loss of the inverter and providing an operation command and a frequency command to the PWM controller to continuously operate the inverter based on the parameter. It includes.

For carrying out the disconnecting switch of DC current interruption

本发明涉及一种用于在直流电流源(2)与电装置(6)之间、尤其是在光伏发电机与逆变器之间进行直流电流中断的隔离设备(10)。隔离设备(10)具有机械开关(16)，机械开关具有第一固定接触部(18)、第二固定接触部(20)和能在第一位置(32)与第二位置(34)之间运动的接触桥(22)。在第一位置(32)中，第一固定接触部(18)和第二固定接触部(20)借助接触桥(22)电接触，并且在第二位置(34)中，接触桥(22)与第一固定接触部(18)和第二固定接触部(20)间隔开。接触桥(22)和第一固定接触部(18)与半导体开关(40)电接触，当接触桥(22)在第一位置(32)中时，该半导体开关是电流截止的。半导体开关(40)的控制输入端(44)与机械开关(16)相连，使得在接触桥(22)运动到第二位置(34)中时由于跨越开关(16)的电弧(60)而产生的电弧电压(64)使半导体开关(40)切换成导引电流。

Motor drive apparatus performing algorithm for preventing abnormal operation

본 발명은 불안정한 전원으로 인한 이상 동작을 방지할 수 있는 알고리즘을 수행하는 모터 구동 장치에 관한 것이다. 본 발명에 따른 상기 모터 구동 장치는, 입력받은 직류전압을 교류전압으로 변환시켜 모터에 제공하는 인버터와, 상기 직류전압이 기준전압 보다 작게 유지되는 시간을 감지하고, 이를 기초로 인버터에 인가되는 제어 신호를 차단하는 제어유닛을 포함함으로써, 이상 전원 입력에 의한 피크 전류의 발생을 방지하고 모터 제어의 안정성을 확보할 수 있다.

Electric motor drive device and electric power steering device using the same

Overvoltage protection for inverters that comprise an EMC filter at their input end

새로운 과전압 보호 장치에서는 어스에 대하여 과전압을 전환 (divert)하기 위한 과전압 방지 장치가 직류 전압원에서 보아서 EMC 필터 뒤에서 인버터의 전류 전달 전선에 연결된다. 이 과전압 방지 장치는 일시적 과전압의 결과 EMC 필터의 여기 (excitation)에 의해 야기되는 과전압을 전환하고 인버터를 과전압으로부터 보호할 수 있다. 여기서 EMC 필터 뒤의 과전압 방지 장치를 전선과 어스 사이에만 연결하는 것으로 충분하다는 것이 입증된다. 즉, 과전압에 대해 개별 전선들 사이에서 작동하는 과전압 방지 장치가 생략될 수 있다. 이것은 직류 전압 입력단에서 직류 전압원에서 보아 과전압 방지 장치 뒤의 전선들 사이에 연결되는 버퍼 커패시턴스의 영향이다. 이 버퍼 커패시턴스의 크기는 보통 아직 어스쪽으로의 디버전을 트리거하지 않는, 전선들 사이의 과전압을 위험하지 않은 정도로 버퍼링하기에 충분하다. In the new overvoltage protection device, an overvoltage protection device for diverting the overvoltage to earth is connected from the DC voltage source to the inverter's current carrying wire behind the EMC filter. This overvoltage protection device can switch overvoltage caused by excitation of EMC filter as a result of transient overvoltage and protect the inverter from overvoltage. Here, it is proved enough to connect the overvoltage protection device behind the EMC filter only between the wires and the earth. That is, an overvoltage protection device operating between individual wires for overvoltage can be omitted. This is the effect of the buffer capacitance connected between the wires behind the overvoltage protection device as seen from the DC voltage source at the DC voltage input. The magnitude of this buffer capacitance is usually sufficient to buffer the overvoltages between the wires to a risk that does not yet trigger a deversion towards Earth.

Protecting method for output overvoltage of PV array, device and system

本发明提供一种PV阵列输出过电压时的保护方法，包括：检测PV阵列的输出电压；当PV阵列的输出电压大于逆变器的最大启动电压且小于逆变器的最大直流输入电压允许值时，控制第一开关断开，控制Boost电路中的开关管闭合；判断母线电容上的电压降低到第一预设电压值时，控制开关管断开并持续t1时间；然后判断母线电容上的电压上升到第二预设电压值时，控制开关管闭合并持续t2时间；如此反复控制开关管断开和闭合，以使母线电容的电压稳定于第一预设电压值和第二预设电压值之间，逆变器启动。从而保护Boost开关管、母线电容和逆变器中的开关管，以免器件长时间承受高压而损坏。

Photovoltaic power generation system and method

本申请公开了一种光伏发电系统及方法，涉及光伏发电技术领域。系统包括：逆变器、控制器和至少两个直流支路。每个直流支路包括：DC‑DC变换器和漏电流检测装置。其中，漏电流检测装置用于检测所在的直流支路的漏电流，将漏电流发送给控制器；控制器用于在光伏发电系统运行前根据各个直流支路的漏电流的大小和方向确定存在绝缘故障的直流支路；控制器还用于在光伏发电系统运行时，当直流支路的漏电流的大小超过预设范围时确定直流支路发生绝缘故障。利用该系统能够确定光伏发电系统出现绝缘故障的直流支路，以便于及时对出现绝缘故障的直流支路采取措施，排除安全隐患。

Switching mode power supply

본 발명은, 입력 전압을 제공하는 입력 회로 및 입력 회로를 통전 또는 차단하는 반도체 스위치를 포함하는 1차측 회로부와, 1차측 회로부와 연결되는 1차 권선 및 1차 권선과 자기적으로 접속되는 복수의 2차 권선을 포함하는 변압기와, 복수의 2차 권선과 각각 연결되어 복수의 출력 전압을 공급하는 복수의 2차측 회로부와, 복수의 출력 전압 중 어느 하나를 피드백 받아 출력 전압을 일정하게 제어하기 위한 보상 전압을 산출하는 피드백 회로부와, 보상 전압에 따라 반도체 스위치의 온오프 듀티비를 제어하는 제어부와, 복수의 출력 전압 중 어느 하나를 피드백 받아 피드백 회로부의 고장 유무를 판단하고, 피드백 회로부 고장 시 상기 제어부의 전원을 차단하는 보호 회로부를 포함하는 스위칭 모드 전력 공급 장치를 제공한다.

Photovoltaic inverter

본 명세서는 태양광 모듈과 연결하는 절환 장치를 구비하여 연결 극성에 무관하게 상기 태양광 모듈과 정상 연결하는 태양광 인버터에 관한 것이다. 이를 위하여 본 명세서에 따른 태양광 인버터는, 태양광 모듈의 +극성 또는 -극성을 각각 연결하는 제1 단자와 제2 단자와 연결하는 입력부; 상기 입력부에 연결된 제1 단자와 제2 단자를 미리 설정된 인버터부의 극성에 맞게 제어하는 절환 장치; 상기 절환 장치를 통해 상기 입력부로부터 전달되는 상기 태양광 모듈의 전압을 승압하는 부스터부; 상기 부스터부에 의해 승압된 전압을 충전하는 커패시터; 및 상기 커패시터에 충전된 전압을 교류 전압으로 변환하여 계통에 제공하는 인버터부;를 포함한다.

Arc detection and prevention in power generation system

本申请涉及发电系统的电弧检测和预防。一种用于在包括光伏板和利用DC输电线与所述光伏板可连接的负载的系统中的电弧检测的方法。所述方法测量传递到所述负载的功率，因而产生传递到所述负载的功率的第一测量结果。还测量通过所述光伏板产生的功率，因而产生通过所述光伏板产生的功率的第二测量结果。比较所述第一测量结果与所述第二测量结果，因而产生差分功率测量结果。当所述差分功率测量结果超过阈值时，还可以设置报警条件。优选地，调制所述第二测量结果并通过所述DC输电线传输所述第二测量结果。

Inverter system and PV system

Die Erfindung betrifft ein Wechselrichter-System, bei welchem eine Wechselrichtereinheit bei Erkennen eines Lichtbogens durch eine Lichtbogenerkennungseinrichtung AC-seitig getrennt wird. The invention relates to an inverter system in which an inverter unit is separated on the AC side when an arc is detected by an arc detection device.

Constant current fast charging of electric vehicles via dc grid using dual inverter drive

A DC charging circuit includes a first inverter module corresponding to a first battery; a second inverter module corresponding to second battery; and DC terminals tapping off a high-side of the first inverter module and a low-side of the second inverter module.

Converter system and wind or water power plant

The invention relates to a converter system, comprising a rectifier (1) and at least two inverters (2), wherein the rectifier (1) can be supplied with energy by an alternating-current source (3), the rectifier (1) is connected to each of the inverters (2) by means of a common direct-current circuit (4) in order to supply energy to the inverter (2), and each inverter (2) can be connected to a respective electrical load (5) in order to supply energy to the respective load (5). According to the invention, a converter system that is especially reliable is realized in that a decoupling device (6) is arranged in at least one of the connections between the direct-current circuit (4) and one of the inverters (2), wherein the decoupling device (6) prevents electrical energy coming from the inverter (2) from being transmitted in the direction of the direct-current circuit (4). The invention further relates to a wind or water power plant, comprising a rotor, wherein the rotor has a rotor hub and at least two rotor blades and the rotor blades can be rotated about the respective longitudinal axes thereof by electrical loads (5). According to the invention, a wind or water power plant that is especially reliable is realized in that the wind or water power plant has a converter system according to one of the claims 1 to 11, wherein the converter system supplies the loads (5) with energy.

Device for detecting overcurrent in an electrical power circuit

------ Dispositif de détection de sur-courant dans un circuit électrique de puissance L’invention concerne un dispositif de détection de sur-courant dans un circuit électrique de puissance, ledit dispositif de détection de sur-courant comprenant : une résistance de shunt (R3) configurée pour être reliée aux bornes du circuit électrique de puissance ; un étage amplificateur (1) dont l’entrée est reliée à l’une des bornes de la résistance de shunt (R3), l’étage amplificateur (1) étant configuré de telle sorte que la tension de sortie de l’étage amplificateur (1) est fonction du courant aux bornes de la résistance de shunt (R3) ; et un étage comparateur (2) configuré pour comparer la tension de sortie de l’étage amplificateur (1) à une tension de référence de manière à détecter un sur-courant dans le circuit électrique de puissance, caractérisé par le fait que ledit dispositif de détection de sur-courant comprend en outre un dispositif de filtrage (3) disposé entre l’étage amplificateur (1) et l’étage comparateur (2). Figure à publier avec l’abrégé : Figure 3 ------ Device for detecting overcurrent in an electric power circuit The invention relates to a device for detecting overcurrent in an electric power circuit, said device for detecting overcurrent comprising: a resistor shunt (R3) configured to be connected to the terminals of the electric power circuit; an amplifier stage (1) whose input is connected to one of the terminals of the shunt resistor (R3), the amplifier stage (1) being configured such that the output voltage of the amplifier stage ( 1) is a function of the current across the shunt resistor (R3); and a comparator stage (2) configured to compare the output voltage of the amplifier stage (1) with a reference voltage so as to detect an over-current in the electric power circuit, characterized in that said device for detection of overcurrent further comprises a filtering device (3) arranged between the amplifier stage (1) and the comparator stage (2). ...

ELECTRICAL SYSTEM WITH A CURRENT CONSUMING CIRCUIT FOR UNLOADING A CAPACITY, MOTOR VEHICLE AND ASSOCIATED METHOD

Le système électrique (100) comporte : - une capacité (C) ; - un dispositif fournisseur d'énergie électrique (102); -un dispositif récepteur d'énergie électrique (104) ; - un circuit électrique consommateur de courant (108) conçu pour consommer un courant (i) entrant par une première borne d'interface (BA) et sortant par une deuxième borne d'interface (BB). Le système électrique (100) étant conçu de sorte que le circuit électrique consommateur de courant (108) consomme le courant de décharge (i) lorsque le dispositif fournisseur d'énergie électrique (102) est connecté aux bornes de la capacité (C). Le circuit électrique consommateur de courant (108) comporte un transistor (Q1) agencé de sorte que le courant (i) consommé entre par une borne d'entrée de courant (C1) du transistor (Q1) et sorte par une borne de sortie de courant (E1) du transistor (Q1), et en ce que la borne de sortie de courant (E1) est connectée à une borne de commande (B1) du transistor (Q1) afin de stabiliser le transistor (Q1). The electrical system (100) comprises: - a capacitor (C); - an electrical power supply device (102); -an electrical energy receiver device (104); - a current-consuming electrical circuit (108) designed to consume a current (i) entering through a first interface terminal (BA) and leaving through a second interface terminal (BB). The electrical system (100) being designed so that the current-consuming electrical circuit (108) consumes the discharge current (i) when the electrical energy supply device (102) is connected to the terminals of the capacitor (C). The current-consuming electric circuit (108) comprises a transistor (Q1) arranged so that the current (i) consumed enters through a current input terminal (C1) of the transistor (Q1) and leaves through an output terminal of current (E1) of the transistor (Q1), and in that the current output terminal (E1) is connected to a control terminal (B1) of the transistor (Q1) in order to stabilize the ...

Multi-level type electrical conversion system protected against electrical overcurrent

S ystème de conversion électrique de type multi niveaux protégé contre une surintensité électrique Un aspect de l’invention concerne un système de conversion électrique comprenant un onduleur 1a agencé selon une topologie de type multi niveaux à k bras et un dispositif de commande de coupure 2 contre une surintensité électrique, relié à un ensemble de premières lignes intermédiaires pour mesurer une première tension intermédiaire V1 continue. Le dispositif de commande de coupure 2 étant configuré pour déterminer un défaut en détectant si la première tension intermédiaire V1 continue mesurée est en dehors d’une plage de variation de tension nominale [Vmax1, Vmin1] de ladite première tension intermédiaire V1 et transmettre un signal de commande d’ouverture généralisée 221 pour une ouverture des interrupteurs électroniques de commutation de chaque bras lorsque le défaut est déterminé. Figure à publier avec l’abrégé : Figure 3 Electrical conversion system of the multi-level type protected against an electrical overcurrent One aspect of the invention relates to an electrical conversion system comprising an inverter 1a arranged according to a topology of the multi-level type with k arms and a cut-off control device 2 against an electrical overcurrent, connected to a set of first intermediate lines to measure a first DC intermediate voltage V1. The cut-off control device 2 being configured to determine a fault by detecting whether the measured first DC intermediate voltage V1 is outside a nominal voltage variation range [Vmax1, Vmin1] of said first intermediate voltage V1 and transmitting a signal generalized opening control 221 for opening of the electronic switching switches of each arm when the fault is determined. Figure to be published with abstract: Figure 3

Over voltage protection circuit for motor

본 발명은 모터의 과전압 보호회로에 관한 것으로, 3상 교류전원을 사용하는 인버터에서 BLDC등과 같은 모터 제동시, 역기전력으로 직류링크단 전압이 상승하는 경우가 발생하는데, 이와같은 과전압 이상 현상이 발생할 경우 상기 직류링크단과 제어전원측을 절연시키면서, 직류링크단의 과전압을 감지하여 이를 방전시킴으로써, 과전압에 의한 모터의 인버터 직류링크단 손상을 방지하도록 한 것이다. 이를 위하여 본 발명은 상용교류전원을 정류하는 정류부와; 상기 정류부의 정류신호를 평활하여 인버터에 직류링크전압을 인가하는 직류링크단과; 상기 정류부와 직류링크단에 위치하여, 상기 직류링크단의 직류링크전압을 감지하여 그 직류링크 전압이 일정값 이상 상승하면, 상기 직류링크전압을 방전시켜 직류링크단을 보호하는 과전압보호기를 포함하여 구성한다. The present invention relates to an overvoltage protection circuit of a motor, and in case of braking a motor such as a BLDC in an inverter using a three-phase AC power source, a DC link voltage rises due to counter electromotive force. By insulating the DC link stage and the control power supply side, the overvoltage of the DC link stage is sensed and discharged to prevent damage to the inverter DC link stage of the motor due to the overvoltage. To this end, the present invention and the rectifier for rectifying the commercial AC power supply; A DC link stage for applying a DC link voltage to the inverter by smoothing the rectified signal of the rectifier; Located in the rectifier and the DC link stage, and detects the DC link voltage of the DC link stage, if the DC link voltage rises above a certain value, including an overvoltage protector to discharge the DC link voltage to protect the DC link stage Configure.

Switched Mode Power Supplies with Low Voltage Protection Circuits

개시된 스위칭모드 전원공급장치는 입력되는 교류전원의 전압값이 소정 값 이하로 떨어지는 경우(브라운 아웃 조건) 스위칭모드 전원공급장치가 기동되지 않도록 하거나, 정상적으로 동작하고 있는 스위칭모드 전원공급장치의 동작을 중지하도록 해주는 회로를 포함하는 것에 관한 것이다. 본 발명에 따른 저전압 보호회로를 갖는 스위칭모드 전원공급장치는 입력되는 교류전압을 정류하고 평활하여 직류전압을 출력하는 제 1 정류 및 평활 회로부와, 제 1 정류 및 평활 회로부의 출력전압을 입력받아 소정의 직류전압으로 변환하는 기동 전원부와, 기동 전원부의 출력전압을 입력받아 기동되어 소정의 펄스폭변조 파형을 출력하며 과전압 보호회로를 갖는 펄스폭변조 제어부와, 펄스폭변조 제어부의 출력 파형에 의해 스위칭되는 스위칭 트랜지스터와, 스위칭 트랜지스터의 스위칭에 따라 1차측 코일에 인가되는 제 1 정류 및 평활 회로부의 출력전력을 2차 및 3차측 코일로 유기시키는 스위칭 변압기와, 스위칭 변압기의 2차측 코일로 유기되는 전압을 정류하고 평활하여 부하에 공급되는 소정의 직류전압을 출력하는 제 2 정류 및 평활 회로부와, 스위칭 변압기의 3차측 코일로 유기되는 전압을 정류하고 평활하여 또다른 소정의 직류전압을 출력하는 제 3 정류 및 평활 회로부와, 제 3 정류 및 평활 회로부의 출력전압을 인가받고 펄스폭변조 제어부의 구동전압을 출력하는 정전압 회로부와, 제 1 정류 및 평활 회로부의 출력전압을 인가받고 이 값이 정해진 값보다 낮아지면 기동 전원부가 구동되지 않도록 제어하는 제 1 보호 회로부와, 입력되는 교류전압이 정해진 값보다 낮아지면 정전압 회로부의 출력전압이 높아지도록 제어하여 펄스폭변조 제어부의 과전압 보호회로가 동작하기에 충분한 구동전압이 펄스폭변조 제어부에 공급되도록 함으로써 펄스폭변조 제어부의 동작이 중지되도록 하는 제 2 보호 회로부로 구성됨을 특징으로 한다. 따라서, 본 발명의 장치는 간단한 회로구성을 갖는 보호회로를 더 포함함으로써 낮은 교류전압이 입력됨에 기인하는 과전류로부터 스위칭모드 전원공급장치뿐만 아니라 스위칭모드 전원공급장치에 접속되는 부하의 회로 소자들을 안전하게 보호할 수 있다는 장점을 갖는다.

ELECTRICAL SYSTEM WITH CURRENT CONSUMER CIRCUIT FOR DISCHARGING A CAPACITY, MOTOR VEHICLE AND METHOD THEREOF

Le système électrique (100) comporte : - une capacité (C) ; - un dispositif fournisseur d'énergie électrique (102); -un dispositif récepteur d'énergie électrique (104) ; - un circuit électrique consommateur de courant (108) conçu pour consommer un courant (i) entrant par une première borne d'interface (BA) et sortant par une deuxième borne d'interface (BB). Le système électrique (100) étant conçu de sorte que le circuit électrique consommateur de courant (108) consomme le courant de décharge (i) lorsque le dispositif fournisseur d'énergie électrique (102) est connecté aux bornes de la capacité (C). Le circuit électrique consommateur de courant (108) comporte un transistor (Q1) agencé de sorte que le courant (i) consommé entre par une borne d'entrée de courant (C1) du transistor (Q1) et sorte par une borne de sortie de courant (E1) du transistor (Q1), et en ce que la borne de sortie de courant (E1) est connectée à une borne de commande (B1) du transistor (Q1) afin de stabiliser le transistor (Q1). The electrical system (100) comprises: - a capacitor (C); - an electrical power supply device (102); -an electrical energy receiver device (104); - a current-consuming electrical circuit (108) designed to consume a current (i) entering through a first interface terminal (BA) and leaving through a second interface terminal (BB). The electrical system (100) being designed so that the current-consuming electrical circuit (108) consumes the discharge current (i) when the electrical energy supply device (102) is connected to the terminals of the capacitor (C). The current-consuming electric circuit (108) comprises a transistor (Q1) arranged so that the current (i) consumed enters through a current input terminal (C1) of the transistor (Q1) and leaves through an output terminal of current (E1) of the transistor (Q1), and in that the current output terminal (E1) is connected to a control terminal (B1) of the transistor (Q1) in order to stabilize the ...

Apparatus for controlling employing inverter with function of stablilization to voltage

An embodiment of the present invention relates to an inverter control unit having a voltage stabilization function. In controlling oscillation operation of an inverter, the inverter control unit adds an integer value change in accordance with a temperature change of an input side component and a diode (negative (-) characteristic) so that balance of reference voltage and feedback voltage is achieved due to fluctuation of control output voltage in accordance with the temperature change to minimize the voltage fluctuation in accordance with the rapid temperature change. Therefore, in controlling the oscillation operation of the inverter, stability of the control output voltage for each different target temperature is realized, thereby stabilizing the voltage fluctuation in accordance with the rapid temperature change.

Device for protecting a speed controller against overcurrent

本发明涉及一种速度控制器，包括：整流模块(12)，从供电网络(A)获取交流电压，来在电源总线(10，11)上产生直流电压；总线电容器(Cb)，连接在电源总线的正极线路和负极线路之间；和逆变模块(13)，由电源总线供电，受控输出交流电压到电气负载(2)；保护装置(14)，当供电网络(A)中由于电压变化而产生过电流时，对控制器进行保护。

Phase current detecting apparatus for speed controling of inverter

본 발명은 인버터 속도제어용 상전류검출장치에 관한 것이다. 본 발명에 따르면, 상기 상전류검출장치는 아이솔레이션 앰프로서 기능하는 전류검출부, 리미트회로와 필터를 구비하여 상기 전류검출부로부터 출력되는 전압을 안정적으로 유지시키는 차동입력 회로부, 그리고 상기 차동입력 회로부로부터 출력되는 신호원의 정류신호를 양(+), 음(-) 양방향에 대해 모두 보호하도록 하는 정류회로부로 구성된다. 본 발명에서는, 상기한 구성을 가지는 상전류검출장치를 이용하여 차량용 인버터의 속도제어를 위한 상전류를 검출함으로써, 과전류로부터 전동기를 보호할 수 있고, 정밀 제어가 가능해진다. The present invention relates to a phase current detection device for inverter speed control. According to the present invention, the phase current detection device includes a current detection unit functioning as an isolation amplifier, a differential input circuit unit having a limit circuit and a filter to stably maintain a voltage output from the current detection unit, and a signal output from the differential input circuit unit. It is composed of a rectifier circuit part to protect the source rectified signal for both positive and negative directions. In the present invention, by detecting the phase current for speed control of the vehicle inverter by using the phase current detection device having the above-described configuration, the motor can be protected from overcurrent and precise control is possible.

A kind of failure self-cleaning MMC topology suitable for DC grid

本发明涉及一种适用于直流电网的故障自清除MMC拓扑，属于多端直流、直流电网技术领域；该故障自清除MMC拓扑包含换流器单元和线路单元，其中换流器单元由改进结构的换流站组成；线路单元由隔离开关、电容和若干串联的二极管并联而组成。该故障自清除MMC拓扑在正常运行的时候，其换流器单元作为换流站运行，与正常工作状态相同；线路单元由于没有接在线路中，所以也不影响系统正常运行；在故障时通过协同控制换流器单元和线路单元，实现故障的清除与隔离。

System and method for over-voltage protection of a photovoltaic string with distributed maximum power point tracking

A string over-voltage protection system and method for arrays of photovoltaic panels (205). The system and method includes a device (220) for use in a photovoltaic array power system. The device includes a voltage converter (225). The voltage converter is adapted to be coupled to a photovoltaic panel in a string (210) of photovoltaic panels. The device also includes a string over-voltage protection circuit (505). The string over-voltage protection circuit is coupled to the voltage converter. The string over-voltage protection circuit senses a string voltage and determines if a string over-voltage condition exists. Additionally, the string over-voltage protection circuit is configured to disable the voltage converter in the event of a string over-voltage condition.

Electrical system having a current-consuming circuit for discharging a capacitor, associated motor vehicle and method

电气系统(100)包括：‑电容器(C)；‑电力供应设备(102)；‑电力接收设备(104)；‑电流消耗电气电路(108)，其被设计为消耗经由第一接口端子(B A )进入并经由第二接口端子(B B )离开的电流(i)。电气系统(100)被设计为使得当电力供应设备(102)连接到电容器(C)的端子时，电流消耗电气电路(108)消耗放电电流(i)。电流消耗电气电路(108)包括晶体管(Q1)，晶体管(Q1)被布置为使得所消耗的电流(i)经由晶体管(Q1)的电流输入端子(C1)进入并经由晶体管(Q1)的电流输出端子(E1)离开，并且电流输出端子(E1)连接到晶体管(Q1)的控制端子(B1)以使晶体管(Q1)稳定。

Inverted circuit overcurrent protection device and hybrid integrated circuit device with the same incorporated

An inverter circuit overcurrent protection device in which an overcurrent detection resistor (Rs) is incorporated in a hybrid integrated circuit, in which a detection voltage from the overcurrent detection resistor (Rs) is divided by voltage dividing resistors (R 1 and R 2 ) and is compared with a reference voltage in an overcurrent detection circuit, for carrying out an overcurrent protection, and an external resistor is connected in series or in parallel with one of the voltage dividing resistors (R 1 and R 2 ) to change a division ratio so that the level of overcurrent protection can be adjusted; and an embodiment wherein, in the vicinity of a current detection terminal, a first pad (P 1 ) is connected to a detection voltage from the overcurrent detection resistance, a second pad (P 2 ) is connected to a detection voltage from the amplifier, and a third pad (P 3 ) is connected to the voltage dividing resistors, and a bonding wire ( 10 ) is connected between the current detection terminal one of said pads, to select one of a plurality of overcurrent protection devices.

Power conversion device

In a multilevel converter (3), three circuit breakers (B11 to B 13) are respectively connected between three arms (A1 to A3) and three reactors (L11 to L13). One circuit breaker (B 11) is a DC circuit breaker configured to interrupt direct current when a short circuit accident occurs between two DC power transmission lines (1, 2). Each of the two circuit breakers (B 12, B 13) is an AC circuit breaker configured to interrupt alternating current when the short circuit accident occurs. When the short circuit accident occurs, the two AC circuit breakers (B12, B13) are brought into the non-conductive state and then the DC circuit breaker (B 11) is brought into the non-conductive state, thereby interrupting the short circuit current.