SU1398077A1 - Contactless d.c. switch - Google Patents

Abstract

The invention relates to electrical engineering. Non-contact DC switch contains I, 2, 9, 10 power thyristors, control unit 3, switching node 4, made in the form of a symmetric RC bridge, capacitors 5, 6, resistors 7, 8, power buses 11, 12, loads 13 14. As a result of the introduction of new electrical connections between functional elements, the non-contact switch of direct current has increased reliability. 1 il.

Description

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The invention relates to electrical engineering, and more specifically to contactless equipment, performed on thyristorics or other semiconductor devices and intended for switching loads in direct current circuits.

The purpose of the invention is the concept of reliability.

In the drawing pr, a basic circuit diagram of a non-contact dc switch is shown.

The device contains the first and second; a swarm of power thyristors 1 and 2, a control unit p, a switching unit 4, which is made in the form of a symmetric RC bridge, the shoulders of which have capacitors 5 and 6 and resistors: 7 and 8j in the diagonal of the RG-bridge included; Two additional thyristors 9 and 10, which are connected anti-parallel, the first and second power buses 11 and 12, the first and second loads 13 and 14.

The first and second outputs of control unit 3 are connected to the control electrodes of power thyristors 1 and 2 and additional thyristors 9 and 10, power thyristors 1 and 2 through the corresponding loads 13 and 14 are connected to the first power bus 11, and the cathodes to the second bus 12 power 1 The switching node 4 is connected between the anodes of power thyristors 1 and 2.

The device works as follows.

Let the thyristor 1 be open at the initial moment, which means that the load 13 is turned on, and both capacitors and b are charged before the supply voltage and have the polarity shown in the drawing. To switch off loads of load 13 and turn on load 14, block 3

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is twice the supply voltage, and it turns off. Since resistors 7 and 8 interfere with the flow of current, the main current of capacitor overcharging flows through the circuit: bus 1, load 13, capacitor 5, additional thyristor 10, capacitor 6, thyristor 2, and bus 12. After recharging capacitors 5 and 6 to a total voltage value equal to the supply voltage, the thyristor 10 is closed. Further, the capacitors 5 and 6 are charged each up to a voltage equal to the supply voltage, respectively, through the resistors 8 and 7, wherein the polarity of the voltage of the capacitors is the opposite of that shown in the drawing. After that, the device is ready for the next switching of loads.

Claims (1)

Invention Formula A contactless DC switch containing the first and second power thyristors, the switching node and the control unit, the first and second outputs of which are connected to the control electrodes of the first and second power thyristors, respectively, the anodes of the first and second power thyristors through appropriate first and second loads connected to the first power bus, the cathodes of the first and second power thyristors are connected to the second power bus, the switching node is connected between the anodes of the power thyristors, characterized in that In order to increase reliability, the switching node is implemented in the form of a symmetric RC-bridge and two additional thyristors are introduced, which are connected to the opposite side of the