SU474952A1 - Switching circuit control device - Google Patents

Description

The device works as follows.

In the initial state, the capacitor 13 of the generator 5 is charged to the voltage of the power source. In the case when the elements of the switching day closure are nolukoprovodnye controlled thyristors, the device controlling the switching field is simultaneously sent to the device: to start the generator 5 (the signal goes to the control electrode of the thyristor 14) and to close the switching circuit. The thyristor 14 is turned on, and the capacitor 13 is discharged through serially connected input winding 1 of the magnetic element 2, the primary winding 3 of the output transformer 4 and the connected thyristor 14. If at this time the switching circuit was in a closed state, then the current would pass through the magnetic winding 6 element 2 along the circuit: secondary winding 7 of the output transformer 4-input winding 6 of the magnetic element 2-output 8-switching circuit-output 9-secondary winding 7 of the output transformer 4.

Since the magnetic fluxes of the input windings 1 and 6 of the magnetic element 2 are directed oppositely, there will be no signal in its output winding 10.

The thyristor 14 will turn off after the capacitor 13 is discharged. If, for some reason, the switching circuit does not close, then the current will flow only through the input winding 1 of the magnetic element 2. In its output winding 10, a signal goes through the output terminal 11, 12 will be input to the executive logic node.

When using relay contacts (reed switches) as elements closing the switching circuit, the generator 5 is started some time after a command is given to close this switching circuit.

The device variant (see Fig. 2) differs from the previous one in that a core with a rectangular hysteresis loop is used as the magnetic element 2, additionally having a winding 16 for reading connected to the source 17 of read pulses.

The source 17 of pulses contains a capacitor 18, which is connected via diode 19 to the connection point of capacitor 13 and the throttles 15 of generator 5, and through the serial connection of dynistor 20 and primary winding 21 of transformer 22 is connected with winding 16 of element 2. Secondary winding 23 of transformer 22 is The second output of the source is 17 pulses. If the switching circuit closes, when the generator 5 starts up, the core of element 2 will not change its initial, for example zero, state, and when the source 17 of pulses B is triggered, the output winding 10 of element 2

there will be no signal. If the switching circuit is not closed, then element 2 switches to the state "1", and when a current pulse passes through the winding 16 at the outputs 11, 12 of the output winding 10, a signal that the switching circuit has not occurred.

The generator 5 and the source 17 are a general circuit solution and operate as follows.

In the initial state, the capacitors 13 and 18 are charged to a voltage equal to the voltage of the power source.

When the thyristor 14 of the generator 5 is turned on, the capacitors 13 and 18 will discharge in series through the element 2 and the primary winding 3 of the output transformer 4, and the discharge of the capacitor 13 will occur through diode 19.

In the secondary winding 7 of transformer 4, a current pulse occurs, which is used to control the MS. When capacitors 13 and 18 are discharged, thyristor 14 is turned off, and capacitor 13 begins to charge with a constant time determined by its capacitance and throttle impedance 15. When the voltage difference across the capacitors 13 and 18 becomes equal to the switching voltage of the dynistor 20, the dynistor included. Through consistently connected winding 16 of element 2 and primary winding

The transformer 22 of the source 17 will pass the discharge current of the capacitor 13 and the charge current of the capacitor 18.

In the secondary winding of 23 transformers

22 also shows a current pulse that is used for control circuits for other purposes. When the voltage on the plates of capacitors 13 and 18 reaches the same value, their simultaneous charging will begin. Dinistor 20 turns off when charging capacitors 13 and 18 to a voltage almost equal to the voltage of the power source.

The input winding 1 of element 2 can be included in the gap between points 24 and 25, which will significantly reduce the number of turns of the input winding 6 of element 2.

Subject invention

A switching-value control device containing a generator of pulses with an output transformer and an executive logic node, to the input of which a switching node is connected, for example a magnetic element, characterized in that, in order to control the integrity of the circuit during operation, one input winding of the magnetic element is connected to the primary winding of the output transformer, and the other input winding is included in the break of the connection of the secondary winding of the output transformer and the controlled switching circuit.

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