SU706910A1

SU706910A1 - Self-sustained bridge inverter

Info

Publication number: SU706910A1
Application number: SU711675543A
Authority: SU
Inventors: Юрий Федорович Агапцев; Анатолий Иванович Федосов; Вячеслав Васильевич Крылов
Original assignee: Специальное Конструкторское Бюро Биофизической Аппаратуры
Priority date: 1971-06-29
Filing date: 1971-06-29
Publication date: 1979-12-30

Description

(54) АВТОНОМНЫЙ МОСТОВОЙ ИНВЕРТОР(54) AUTONOMOUS BRIDGE INVERTER

II

Изобретение относитс к устройствам преобразовани посто нного тока в переменный в частности, дл частотного регулировани асинхронных двигателей.The invention relates to devices for converting direct current into alternating current, in particular, for frequency control of asynchronous motors.

Известные схемы автономных мостр.вых инверторов с отсекающими диодами не обладают достаточно высокой коммутирующей способностью в щироком диапазоне частот на выходе, в особенности в области повыщенной частоты.The known schemes of autonomous bridge invertors with cut-off diodes do not have a sufficiently high switching capacity in a wide frequency range at the output, especially in the area of higher frequency.

Цель изобретени - устранение указанного недостатка.The purpose of the invention is to eliminate this drawback.

Эта цель достигаетс тем, что в автономном мостлвом инверторе с отсекающими диодами аноды обратных диодов подключены соответственно к точкам соединени силовых тиристоров анодной группы с отсекающими диодами, а катоды обратных диодов- к точкам соединени силовых тиристоров катодной группы с отсекающими диодами.This goal is achieved by the fact that in an autonomous bridge an inverter with cutting diodes, the anodes of reverse diodes are connected respectively to the connection points of the power thyristors of the anode group with the cutting diodes, and the cathodes of the reverse diodes to the connection points of the power thyristors of the cathode group with the cutting diodes.

На чертеже изображена схема предлагаемого автономного мостового инвертора.The drawing shows a diagram of the proposed Autonomous bridge inverter.

Инвертор содержит тиристоры 1-6, коммутирующие конденсаторы , отсекающие диоды 13-18, обратные диоды 19-24,The inverter contains thyristors 1-6, switching capacitors, cut-off diodes 13-18, reverse diodes 19-24,

коммутирующие дроссели 25, 26, входные дроссели 27, 28, мост обратных диодов 29. Инвертор питаетс от источника 30 через конденсатор 31 и нагружен на электродвигатель 32. switching inductors 25, 26, input inductors 27, 28, a bridge of reverse diodes 29. The inverter is powered from source 30 through a capacitor 31 and loaded onto an electric motor 32.

Инвертор работает следующим образом. Предположим, первоначально провод т ток тиристоры 1 и 2, затем включаетс тиристор 3. Тиристор 1 включаетс током перезар да коммутирующих конденсаторов 7, 8, 9, эквивалентна .величина емкости которых равнаThe inverter works as follows. Suppose that thyristors 1 and 2 are initially connected, then thyristor 3 is turned on. Thyristor 1 is turned on by the current recharging of switching capacitors 7, 8, 9, equivalent to the capacity of which is

,(1),(one)

где С. - величина емкости коммутирующих конденсаторов 7-12.where C. is the value of the capacity of the switching capacitors 7-12.

Если предположить, что величина коммутирующих дросселей много больще, чем величина входных дросселей 27, 28, то коммутационный ток замыкаетс при этом по следующей цепи: CjKt, 19, 25, 3, Сэц. ПриAssuming that the magnitude of the commutating chokes is much larger than the magnitude of the input chokes 27, 28, the switching current closes along the following circuit: CjKt, 19, 25, 3, Setc. With

Claims

the switching thyristors 3 and 5 The switching currents are respectively closed in the following circuits: CaA., 20, 25, 5, C and C. 21, 25, 1, C The time during which the reverse diodes 19, 20, 21 are flowing is determined The following known expression: t i- 2 arctg -. -V (2), where tt is the proper circular frequency of the switching circuits; C jrt. Is the voltage equivalent of a capacitor; L is the inductance magnitude of the commutation throttle 25. The time t found from the expression (2), as a rule, does not exceed 100 m. S., While the intervals between the thyristors 1, 3, 5 are, for example, 330 m .with. when the inverter operates at a frequency of 1000 Hz. Thus, reverse diodes cannot be switched on simultaneously, which allows using 1, 3, 5 one drossach 25 for switching thyristors. Similarly, the switching circuits of the lower half of the inverter work. Claim of the invention Autonomous bridge inverter containing anodic and cathodic groups of power thyristors, in series with which cut-off diodes are connected, and switching points are connected between points of series connection of the latter with power thyristors, two groups of reverse diodes, one of which is connected to the anodes by the combined cathodes through an inductor power thyristors and combined anodes through another choke is connected to the cathodes of power thyristors, characterized in that, in order to increase the commutation It has inverter capabilities, reverse diode anodes are connected respectively to the connection points of the power thyristors of the anode group with cutting diodes, and cathodes of the reverse diodes to the connection points of the power thyristors of the cathode group with cutting diodes.