SU993433A1

SU993433A1 - Device for control of thyristorized inverter

Info

Publication number: SU993433A1
Application number: SU813329958A
Authority: SU
Inventors: Николай Ильич Джус
Original assignee: За витель
Priority date: 1981-08-03
Filing date: 1981-08-03
Publication date: 1983-01-30

Description

Изобретение относитс к электротехнике и может использоватьс в преобразовател х посто нного напр жен и- в переменное.This invention relates to electrical engineering and can be used in constant voltage converters and to variable.

Известное устройство дл управлени автономным инвертором, работаквдим на емкостную нагрузку, содержит блок первичных импульсов, подключен ный к рабочим и коммутирукадим тириеторам l .The known device for controlling an autonomous inverter, operating on a capacitive load, contains a block of primary pulses connected to the working and switching terminals of the lasers.

Недостаток данного устройства заключаетс в том, что при его использовании снижаетс КПД инвертора.The disadvantage of this device is that when it is used, the efficiency of the inverter is reduced.

Наиболее близким по технической сущности и достигаемому результату к предлагаемому вл етс устройство дл управлени тиристорным инвертором с нелинейными реакторами, содержащее источник первичных импульсов, первые выходы которого предназначены дл подключени к рабочим тиристорам непосредственно, а вторые к коммутирующим через первые входа элементов И, и пороговые элементы 23..The closest in technical essence and the achieved result to the proposed is a device for controlling a thyristor inverter with nonlinear reactors, containing a source of primary pulses, the first outputs of which are intended to be connected to the working thyristors directly, and the second to the switching elements And, and threshold elements 23 ..

Недостатком известного устройства вл ютс низка надежность и сложность .A disadvantage of the known device is low reliability and complexity.

I Цель изобретени - повьпаение на:дежности и упрощение.I The purpose of the invention is to follow the principles of reliability and simplification.

Поставленна цель достигаетс тем, что устройство снабжено дополнительными элементами И, триггерами и обмотками по числу кo мyтиpyювtиx тиристоров,, причем обмотки предназначены дл включени в магнитную цепь, соответствукш{их нелинейных реакторов, вывода обмоток подключены к пороговым элементам, выходы KOtopax подклю-, The goal is achieved by the fact that the device is equipped with additional AND elements, triggers and windings according to the number of thyristors that are connected, and the windings are intended to be connected to a magnetic circuit, corresponding to {their nonlinear reactors, the output windings are connected to threshold elements, the outputs KOtopax are connected,

10 чены к первым входам дополнительных элементов И, вторые входы дополнительных элементов И соединены с первыми выходами источнкка первичных импульсов, а - с запускающими входа ш соответствующих триггеров, 10 chu to the first inputs of the additional elements And, the second inputs of the additional elements And connected to the first outputs of the source of the primary pulses, and from the starting inputs w of the corresponding triggers,

15 сбрасывающие входы которых подключены к первьп выходам источника первич-; ных импульсов, инверсные выходы триггеров подключены ко вторым входам , 15 dumping inputs are connected to the primary outlets of the primary source; pulses, inverse outputs of the flip-flops are connected to the second inputs,

20 элементов И.20 elements I.

На чертеже представлена схема . устройства.The drawing shows a diagram. devices.

Устройство работает следующим образом .The device works as follows.

2525

Рабочие тиристоры 1 и 2 включеиы в плечо инвертора встречно параллельно с диодами 3 и 4 соответственно, К выходу инвертора подключена нагрузка 5. Соммутирующий контур состоит The working thyristors 1 and 2 are included in the inverter arm opposite in parallel with the diodes 3 and 4, respectively. A load 5 is connected to the output of the inverter. The commuting circuit consists

Claims

30 from reactor b and capacitor 7. There are two switching thyristors 8 and 9. A specific switching circuit for switching commutator and thyristors may be different. Nonlinear reactors with windings 10 and 11, respectively, are connected in series with the working valves. Each of the reactors is equipped with an additional winding 12 and 13 connected to the threshold element 14 and 15. The source 16 primary impulses are connected to the outputs to thyristors 1 and 2 and elements 17 and 18, to the second inputs of which the outputs of threshold elements 14 and 15 are connected. Each of the elements And 17, 18 are connected to the corresponding trigger 19 and 20. The reset input of the trigger 19 and 20 is connected to the output of source 16. Elements 21 to 22 are connected to the outputs to control yydim inputs of switching thyristors 8 and 9. The inputs of elements And are connected to inverse outputs .tr Iggers 19, 20 and the outputs of the source 16. The inverter in a known manner converts a constant input voltage into an output variable. To this end, wide control pulses are alternately transmitted to the working thyristors 1 and 2 from the source 16. When operating on an inductive load, before switching on the next working thyristor 1 or 2, the switching thyristor 8 or 9 is switched on. The oscillatory discharge of the capacitor 7 through the reactor b causes the thyristors 1 to turn off or

2. When working on a capacitive load 5, the current is ahead of the voltage, and by the time of switching on the next working thyristor, the previous one is already off, as the current flows through diode 3 or 4 bypassing the previous thyristor. So with polarity plus the output of the inverter at the beginning of the floor is period a. the current is conducted by the thyristor 1, and at the end by the diode. At the moment of changing the current direction, the nonlinear (saturating) reactor is re-magnetized, a voltage pulse appears on its Toroidal winding 12 and the threshold element 14 sends a signal to element 17. Throughout the polarity plus across the output of the inverter, the thyristor 1 is supplied with a control signal from source 16 and therefore to. the output of the element 17 appears to trigger the trigger 19. At the inverse of the output of the trigger 19, a zero signal appears and the pulse passes through the element 21 to the switching thyristor 8 becomes impossible. The preparation (reset) of the trigger 19 is carried out each time by the leading edge of the working pulse. When operating on an inductive load 5, the magnetization reversal of the nonlinear reactor does not occur during the period of operation of the operating control pulse and the trigger 19 does not start and a switching pulse passes through element I 21. Similarly, the scheme operates at polarity minus at the output. Thus, a special current transformer is required to control the inertor. The threshold element does not have to be adjusted exactly as required in the prototype, where the threshold setting of the threshold element must exceed the magnetization reversal current of the reactor, i.e. fine tuning is required. In the proposed device, the threshold element is needed only to improve noise immunity. Due to this, high accuracy and sensitivity are provided and achieved by simple means. Formula of the Invention A device for controlling a thyristor inverter with nonlinear fieactors, containing a source of primary pulses, the first outputs of which are intended to be connected to the working thyristors directly, and the second to the coi And, rf threshold elements for the number of switching thyristors, characterized in that, in order to increase reliability and simplification, it is provided with an additional And, triggers and windings on the number of switching thyristors, and the windings are intended to be connected to the magnetic circuit of the corresponding reactor reactor, the terminals of the windings are connected to the threshold elements, the outputs of which are connected to the first inputs of the additional elements And, the second inputs of the additional elements And are connected with the first outputs of the source of primary pulses, and the outputs with the triggering inputs of the corresponding trigger-i of the ger, the resetting inputs of which are connected to the first outputs of the source of the primary pulses, inverse outputs of the flip-flops are connected to the second inputs of the elements I, Sources of information taken into account in examination 1, Thyristor frequency converters in the electric drive, M, Energie, 1980, p. ill, rice .. 333. 2, USSR inventor certificate 756599, cl, H 02 R 13/18, 1980 (prototype).

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