SU1001473A1

SU1001473A1 - Ac switch

Info

Publication number: SU1001473A1
Application number: SU813284734A
Authority: SU
Inventors: Иосиф Иванович Дудаш; Иосиф Янович Качур
Original assignee: Предприятие П/Я А-3640
Priority date: 1981-04-29
Filing date: 1981-04-29
Publication date: 1983-02-28

Description

(54) КЛЮЧ ПЕРЕМЕННОГО ТЭКА(54) VARIABLE TEK KEY

1one

Изобретение предназначено дл коммуташга переменного трехфазного тока. The invention is intended for commutating alternating three-phase current.

Известен бесконтактный ключ дл коммутации переменного трехфазного тока, содержащий три группы из встречно-дараллельно включенных тиристора и диода и один управл ющий ключ, обеспечивающий запуск тиристоров через разв зьтаюшие диоды 11 .A contactless switch for switching three-phase alternating current is known, which contains three groups of counter-connected thyristors and a diode and one control switch that enables the start of the thyristors through propagating diodes 11.

Недостатком ключа вл етс ограниченна область применени , так как он может бьпъ применен только дл коммутации трехфазной нагрузку без нулевого провода.The key disadvantage is the limited scope, since it can only be used for switching a three-phase load without a neutral conductor.

Наиболее близким по технической сущности к предлагаемому вл етс бесконтактный ключ переменного тока, содержащий три группы из встречно-параллельно включенных тиристоров, в каждой из которых управл ющие электроды тиристоров соединены между собой через ограничивающий резистор и переклю . нагель управлени 2 .The closest in technical essence to the present invention is a contactless alternating current key comprising three groups of anti-parallel connected thyristors, in each of which the control electrodes of the thyristors are interconnected through a limiting resistor and switch. nog control 2.

Недостаток - низка надежность срабатывани ключа, так как при коммутации переменного трехфазного тока дл каждой группы из встречно-парвллепьно включенных тиристоров нео&содкм свой переключатель управлени .The disadvantage is the low reliability of key operation, since when switching AC three-phase current, each group of opposite-switched thyristors is neo-amp; its own control switch.

Цель изобретени - поБьпиение надежности срабатьгоани ключа переменного тока.The purpose of the invention is to secure the reliability of an AC key.

Claims

The goal is achieved by the fact that three diodes of the first bridge are inserted into the control electrodes of the thyristors of each of which are connected to the resistor, and three points of the opposite terminals of the diodes of each bridge are respectively connected through a resistor and directly from controllers to shi electrodes of the corresponding type. Ristors, and a common control switch is turned on between the points of connection of the diode terminals of the same name. This allows one control switch to control simultaneously the number of groups of two meeting-parallel-connected thyristors. The drawing shows a circuit diagram of the proposed AC key. The AC switch contains anti-parallel thyristors 1-6 in the phase connection circuits .7 9 to the load 10, the control electrodes of the corresponding thyristors are interconnected via limiting resistors 11-13 and diode bridges 14-16. Between the connection points of like terminals Each bridge has a common control switch 17 turned on. The AC switch operates in the following way. When the control switch 17 is open, the current in the control electrode circuits of the oppositely connected thyristors 1-6 is absent, the thyristors 1-6 are closed and the current in the load circuit 10 does not leak. When the control switch 17 is closed, current in the control electrodes of thyristors 1-6 appears, as they are under mains voltage, which leads to opening of thyristors 1-6 in the sequence determined by alternating the phases of the supply network. After the thyristors are opened, they shunt their control circuit, thereby the control current amplitude is limited to not more than the turn-on control current, and the duration of the signal corresponds to the rise time of this current. In the event of a neo & amply simultaneous control of several similar AC keys, the corresponding terminals of their diode bridges are connected in parallel with the control switch 17. Using this AC key allows you to easily and reliably simultaneously turn on and turn off one or more amps & gels with any number of phases by controlling one switch. Claims of alternating current key containing three groups of anti-parallel connected thyristors, each of which has a resistor in the control electrode circuit of the thyristors, characterized in that, in order to increase the reliability of the operation of the alternating current key, three diode bridges are inserted into it, the connections of the opposite terminals of the diodes of each bridge are connected, respectively, through a resistor and directly to the control electrodes of the corresponding thyristors, and between the points of connection of the same outputs, each bridge is turned on the common control switch. Sources of information log taken into account during the examination, 1 Electronic equipment in automation. Sat dog articles ed. Koneva Yu. I., no. 6. M., Soviet ration, 1974, p. 99, fig. 2

2. Skarzhecha V. A. and others. Automation devices on thyristors. K., Technique, 1974, p. 102