SU907675A1

SU907675A1 - Protected static converter

Info

Publication number: SU907675A1
Application number: SU802932309A
Authority: SU
Inventors: Виктор Эмильевич Дель; Фархад Шарипович Абсалямов; Александр Константинович Белкин; Владимир Борисович Миков; Александр Николаевич Сухарев
Original assignee: Уфимский авиационный институт им.Орджоникидзе
Priority date: 1980-05-29
Filing date: 1980-05-29
Publication date: 1982-02-23

Description

Изобретение относится к преобразовательной технике.The invention relates to a conversion technique.

Известен статический преобразователь с защитой от внешних и внутренних коротких замыканий, содержащий схему емкостного гашения с двумя конденсаторами, включенными через разделительные и коммутирующие вентили между зажимами переменного и постоянного тока преобразователя fl J.Known static converter with protection against external and internal short circuits, containing a capacitive blanking circuit with two capacitors connected through isolation and switching valves between the clamps of the alternating and direct current transducers fl J.

Недостатком этого устройства является его сложность.The disadvantage of this device is its complexity.

Наиболее близким к предлагаемому является статический преобразователь с защитой, содержащий подключенный через трансформатор к сети переменного тока трехфазный мостовой управляемый выпрямитель, выход которого соединен с входом автономного инвертора и через ограничительные резисторы с неуправляемым мостовым выпрямителем, два конденсатора, два резистора подзаряда и цепочку из последовательно соединенных дросселя, диода и тиристора f2j.Closest to the proposed is a static converter with protection, containing a three-phase bridge controlled rectifier connected via an transformer to an AC network, the output of which is connected to the input of an autonomous inverter and through limiting resistors with an uncontrolled bridge rectifier, two capacitors, two charging resistors, and a chain of series-connected inductor, diode and thyristor f2j.

Однако для этого устройства характерна надежность из-за перегрузки диодов неуправляемого мостового выпрямителя.However, this device is characterized by reliability due to overloading the diodes of an uncontrolled bridge rectifier.

Цель изобретения - повышение надежности .The purpose of the invention is to increase reliability.

Эта цель достигается тем, что конденсаторы и резисторы подзаряда соединены в мост, одна диагональ которого подключена к входу инвертора, а в другую диагональ включена цепочка из дросселя, диода и тиристора. _1S На чертеже приведена схема устройства .This goal is achieved by the fact that the capacitors and charging resistors are connected to a bridge, one diagonal of which is connected to the inverter input, and a chain of a choke, diode, and thyristor is included in the other diagonal. _1S The drawing shows a diagram of the device.

Устройство.состоит из мостового трехфазного управляемого выпрямителя на тиристорах 1-6 с входным транс20 форматором 7, автономного инвертораThe device consists of a bridge three-phase controlled rectifier on thyristors 1-6 with input trans20 formator 7, a standalone inverter

8,неуправляемого выпрямителя на диодах 9-14,подключенного через ограничительные резисторы 15 и 16 параллель но управляемому выпрямителю и инвер3 907675 тору,конденсаторы 17 и 18,резисторы 19 и 20 подзаряда и последовательную цепочку из дросселя 21, диода 22, тиристора 23, причем конденсаторы 18 и 16 и резисторы 19 и 20 соеди- ₅йены в мост.8, an uncontrolled rectifier on diodes 9-14 connected through limiting resistors 15 and 16 to a parallel controlled rectifier and inverter 3 907675 torus, capacitors 17 and 18, charging resistors 19 and 20 and a series circuit from the inductor 21, diode 22, thyristor 23, and capacitors 18 and 16 and resistors 19 and 20 connect ₅ yen to the bridge.

При внутренних или внешних коротких замыканиях подается сигнал на снятие управляющих импульсов с тиристоров выпрямителя и на включение за- ю щитного.тиристора 23. Пусть в момент аварийной ситуации работали тиристоры 4 и 5· В результате включения тиристора 23 конденсаторы 17 и 18 начинают заряжаться по цепи: тирис- ts тор 5, вторичные обмотки трансформатора 7, тиристор 4, конденсатор 18, диод 22, тиристор 23-, конденсатор . .... 17. Так как ток и,/разряда кон-деыса- . <· торов 17 и 18 направлены встречно (jq аварийному току,' то _;тиристоры V и-5· '* запираются, отделяя источник пита- .In case of internal or external short circuits, a signal is sent to remove control pulses from the rectifier thyristors and to turn on the shield thyristor 23. Let thyristors 4 and 5 work at the time of the emergency. As a result of turning on thyristor 23, capacitors 17 and 18 begin to charge on the circuit : thyristis ts torus 5, secondary windings of transformer 7, thyristor 4, capacitor 18, diode 22, thyristor 23-, capacitor. .... 17. Since the current and, / discharge con-deys-. <· Of the tori 17 and 18 are directed in the opposite direction (jq to the emergency current, 'then _{; the} thyristors V and-5 ·' * are locked, separating the power source.

ния от коротко-замкнутых элементов. По мере перезаряда конденсаторов 17 и 18 ток спадает и после перехо- 25 да его через нуль диод 22 и тиристор 23 запираются.niya from short-circuited elements. As the capacitors 17 and 18 are recharged, the current decreases and after 25 is switched on, the diode 22 and the thyristor 23 are blocked through zero.

Устройство обеспечивает повышенную надежность работы и имеет простую схему.The device provides increased reliability and has a simple circuit.

Claims

The invention relates to a converter technique. A static converter with protection against external and internal short circuits is known, containing a capacitive quenching circuit with two capacitors connected via isolating and switching valves between terminals G1 of the alternating and direct current of the converter 1. The disadvantage of this ycTpOkCTsa is its complexity. Closest to the proposed is a static converter with protection containing a three-phase bridge controlled rectifier connected through a transformer to an AC network, the output of which is connected to the input of an autonomous inverter and through limiting resistors with an uncontrolled bridge rectifier, two capacitors, two resistor podzar and the chain of series-connected Drossel diode and thyristor. However, for this device, reliability is characteristic due to the overload of the diodes of the uncontrollable bridge rectifier. The purpose of the invention is to increase reliability. This goal is achieved by the fact that capacitors and resistors of the subcharger are connected to a bridge, one diagonal of which is connected to the input of the inverter, and a chain of drossel, diode and thyristor is connected to the other diagonal. The drawing shows a diagram of the device. The device consists of a three-phase bridge controlled rectifier on thyristors 1-6 with an input transformer 7, an autonomous inverter 8, an uncontrolled rectifier on diodes E. connected through limiting resistors 15 and 16 in parallel with a controlled rotator and inhaler condenser 17 and 18, resistors 19 and 20, and a series of circuits from drossel 21, diode 22, thyristor 23, with capacitors 18 and 16 and resistors 19 and 20 connected in a bridge. In case of internal or external short circuits, a signal is given to remove the control pulses from the recirculator thyristors and to turn on the protective one. thyristor 23. Suppose that at the time of the emergency thyristors 4 and 5 worked. As a result of switching on the thyristor 23, the capacitors 17 and 18 begin to charge along the circuit: the thyristor 5, the secondary windings of the transformer 7, the thyristor, the capacitor 18, the diode 22, the thyristor 23-, the capacitor. „17. Because Densistors 17 and 18 are set against the emergency current, then; the thyristors V and- are locked, the power supply section; nor from short-closed elements. As the capacitors 17 and 18 are recharged, the current drops and, after passing it through zero, the diode 22 and thyristor 23 are locked. The device provides increased reliability and has a simple circuit. Claims of the Invention A static converter with protection containing a three-phase bridge controlled rectifier connected via a transformer to an AC network, the output of which is connected to the input of an independent inverter and through limiting resistors with an unmanaged bridge rectifier, two capacitors, two charge resistors and a chain series-connected chokes, a diode and a thyristor, characterized in that, in order to increase reliability, capacitors and charge resistors are connected in a bridge, one diagonal which is connected to the input of the inverter, and the other diagonal includes a chain of drossel, a diode and a thyristor. Sources of information taken into account in the examination 1. USSR author's certificate W 520661, cl. H 02 H 7/10, 1976.

2. All-Union Scientific and Technical Conference Development and industrial application of semiconductor frequency converters in mechanical engineering. Theses of reports. M., 1977, p. 197, fig. one.