SU1510076A1 - Relay-thyristor switch - Google Patents

Abstract

The invention relates to a pulse technique and can be used in devices for automatic switching of electrical circuits. The goal is to increase the reliability of the thyristor relay switch operation by the fact that the control unit is made on electromagnetic relays with windings 4 and 6, the artificial switching unit of the thyristors is made on a transistor 10. The thyristor relay switch also contains a power bus, a common bus, and closing and opening contacts 5.1, 7.1 and 5.2, 7.2 respectively, resistors 11-14, thyristors 2, 3, terminals 8, 9. 1 Il.

Description

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The invention relates to a pulse technique and can be used in devices for automatic switching of electrical circuits.

The purpose of the invention is to increase the reliability of work by changing the number of elements and their execution.

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The drawing shows a circuit diagram of a switch.

The thyristor relay switch contains the control input terminal 1, the first 2 and second 3 thyristors, the first electromagnetic relay with winding 4, the first 5.14 second 5.2 closing and opening 5.3 contacts, the second electromagnetic relay with winding 6, closing 7.1 and closing 7.2, all alone windings 4 and 6 of both relays are combined with terminal 8 to be connected to the positive pole of the power source, the other end winding loi 4 (6) of the first (second) relay is connected to the anode of the first 2 (second 3) thyristor, the cathodes of the thyristors 2 and 3 are connected to the terminal 9 to connect to the negative pole of the power source. In the relay-thyristor switch entered the transistor 10 and four resistors 11-14. Input terminal 1 through a serially connected disconnecting contact 7.2 of the second relay and the first resistor 11 is connected to the control 1c of the first thyristor 2 electrode, through the serially connected first shorting contact 5.1 of the first relay and the second resistor

12- to control electrode of the second thyristor 3, through the third resistor

13 to the base of the transistor 10, through the fourth resistor 14 to the emitter of the transistor 10 and to terminal 9 to connect to the negative pole of the power source. One output of the second closing contact 5.2 of the first relay is connected to the anode of the first thyristor 2, and one output of the opening contact 5.3 of the first relay is connected to the anode

° of the second thyristor 3, the other outputs of the disconnecting 5.3 and the second closing 5o2 of the contacts of the first relay are combined and connected to the collector of the transistor 10 via the locking contact 7.1 of the second relay.

Relay-thyristor switch operates as follows.

In the first (initial) steady state, there is no control signal at input terminal 1, thyristors 2 and 3 and transistor 10 are locked, windings 4 and 6 of both relays are de-energized, and both relays are disconnected.

When the left control pulse is applied to the input terminal 1, a current begins to flow through the circuit; terminal 1 - contact 7.2 - resistor 11 - transition of the charging electrode - the cathode of the thyristor 2 - terminal 9 .. In this case, the first thyristor 2 is turned on, and the power supply winding 4 of the first relay is received along the circuit: terminal 8 - winding 4 - transition anode-cathode of the thyristor 2 terminal 9. The first relay triggers, opens its contact 5.3 and closes its contacts 5.1 and 5.2. The switch goes to the second steady state (the first relay is on, the second relay is off). During the passage of the first control pulse, current also flows through the circuit: terminal 1 - resistor 13 - base-emitter transition of transistor 10 - terminal 9. However, since the collector circuit of transistor 10 is broken by contact 7.1 of the second relay, this does not affect operation thyristor relay switch. The duration () of the first ripping pulse is chosen such as to ensure the inclusion of the first thyristor. 2 and the non-inclusion of the second thyristor 3, i.e. so that the passage of the pulse ends before the contact circuit 5.1 closes the first relay

 yi

(one)

g

0

five

where is the start time of the first

thyristor 2;

 - time of the first relay.

When the second control pulse arrives at the input terminal 1, the current flows through the circuit: terminal 1 - contact 5.1 resistor 12 - junction of the control electrode - thyristor cathode 3 - terminal 9. The second thyristor 3 turns on, and the winding 6 of the second relay receives power across the circuit: terminal 8 - winding 6 - transition thyristor anode-cathode 3 - terminal 9. The second relay operates, opens its contact 7c2 and closes its contact 7.1. Relay thyristor switch515

The relay goes into the third steady state (both relays are on). During the passage of the second control pulse, the current flows through the control electrode-cathode transition of the first thyristor 2, but since the thyristor 2 is turned on, the relay-thyristor switch does not change its state. The current through the base-emitter transition of transistor 10 will also flow. The duration C oy) of the second control is vp (its pulse is chosen such that the second thyristor 3 is turned on and the first thyristor 2 is not turned off, i.e. second relay

BUT. . V A.

 ON2, c i,

(2)

where tgKAj turn-on time of the second

thyristor 3;

 ci time for the second relay to work.

When the third control pulse arrives at the input terminal 1, the current flows through the circuit: terminal 1 - resistor 13 - base-emitter junction of transistor 10 - terminal 9. Transistor 10 opens, while the anode-cathode transition of the first thyristor 2 is shunded by the chain: contacts 5.2 and 7.1 - collector-emitter junction of transistor 10. At the same time, the current flowing through the winding 4 of the first relay being switched forks for two parallel circuits. Transistor 10 is selected so that the part of the current branching through the anode-cathode of the first thyristor a 2 was less than its turn-off current. In this case, the thyristor 2 is turned off, but the first relay is turned on, because a current flows through its circuit 4: terminal 8 — winding 4 — contacts 5.2 and 7.1 — junction collector-emitter of transistor 10 — terminal 9 . At the end of the pulse, transistor 10 closes, winding 4 of the first relay is provided, the first relay turns off, opens its contacts 5.1 and 5.2, and closes its contact 5.3. The switch goes to the fourth steady state (the first relay is off, the second relay is on). During the passage of the third control pulse, a current also flows through the control electrode transition 10076 6

the cathode of the second thyristor 3, but since the thyristor 3 is turned on, this does not affect the operation of the switch. The capacity () of the third control pulse is chosen such as to ensure the shutdown of the first

five

0

five

0

0

Ristors 2

on

 about

but

(3)

where 1v | il4 time off first

thyristor 2.

When the fourth control pulse arrives at the input terminal 1, the current flows through the circuit: terminal 1 - resistor 13 - base-emitter transition of transistor 10 - terminal 9. Transistor 10 opens and the transition of the anode - cathode of the second thyristor 3 is bridged by a chain: contacts 5оЗ and 7.1 - collector - emitter junction of transistor 10. At the same time, the current flowing through the winding 6 of the switched on second relay forks in two parallel circuits. Transistor 10 is chosen so that a part of the current branching through the junction of the anode - cathode of the second type ora 3 was less than the turn-off current. At the same time, the T1fistor 3 is turned off, but the second relay is turned on, as the current through the circuit flows through its winding 6: terminal 8 - winding 6 - contacts 5.3 and 7.1 - junction collector - emitter of transistor 10 - terminal 9.

5 At the end of the pulse, transistor 10 closes, winding 6 of the second relay de-energizes, the second relay shuts off, opens its contact 7.1 and closes its contact 7.2. The relay thyristor switch goes to the first (initial) stable state (both relays are disabled). The duration) of the fourth control pulse is chosen such that

 to ensure the shutdown of the second thyristor 3

 how to

but-

(four)

Where

 2

the off time of the second thyristor 3. When the fifth and subsequent control pulses arrive, the processes in the thyristor relay switch are repeated.

Claims (1)

Claims of the invention A thyristor relay switch containing switching cells on thyristors, an artificial clod node. thyristor mutations and a control unit, characterized in that, in order to increase reliability, the artificial switching unit is made on a transistor, and the control unit is made on electromagnetic relays, the windings of which are included in the switching cells between the thyristor anodes and the power supply, while not with a common bus, the collector through the closing contact of the electromagnetic relay of the second switching cell is connected along one circuit through the opening contact of the electromagnetic relay of the first switching cell with an ohm thyristor second commuting cell. and the second circuit through the closing contact of the electromagnetic relay of the first switching cell with the anode of the thyristor of the first switching cell, the control input is connected through the first resistor to the common bus, through the second resistor to the base of the transistor, through the opening contact of the electromagnetic relay of the second switching cell and the third resistor with the control electrode of the thyristor of the first switching cell and through the closing contact of the electromagnetic relay the first switching cell and the fourth resistor - with the control electrode of the thyristor of the second switching cell