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Description

The proposed device is intended to simultaneously start series-connected thyristors and can be used, for example, to create high-voltage pulse modulator or generator devices.

A device for simultaneous start of series-connected thyristors is known. It uses the energy of an auxiliary source of the trigger signal supplied to the control electrodes of the thyristors using pulse transformers.

The main drawback of the device is the need to use a trigger signal source, the power of which must be many times greater than the power required to start a single thyristor, and which must be increased with an increase in the number of series-connected thyristors.

The purpose of the invention is to reduce the power of the trigger source and to ensure uniform distribution of the stationary voltage and recovery voltage across the series-connected thyristors. For this, the output of the primary winding of the transformer of the first transformer is connected to the anode of the switching thyristor, whose cathode is grounded. In addition, parallel to the aforementioned thyristor, the resistance is connected, bypassing a serial RC-chain. In addition, a chain of series-connected resistances is connected in parallel to the thyristors, and an RC-chain of a series-connected resistance and a capacitor is connected in parallel with each of them.

The drawing is a diagram of the proposed device.

It contains pulse transformers 1-4, the primary windings 5 of which are connected in series and separated by capacitors 6-8. Capacitors are shunted by resistors 9-11. The secondary windings 12 of the transformers are connected between the cathode and the control electrode of the series-connected thyristors 18-16. Limit resistances 17–20 are connected in series with the secondary windings. The windings 12 are shunted by diodes 21-24, which bypass the control electrodes of thyristors 13-16 from negative pulses. A voltage divider consisting of resistors 25-28 serves to evenly distribute the stationary voltage across the thyristors. A divider consisting of elements 29, 30-31, 32-33, 34-35, 36 serves to evenly distribute the transient recovery voltage. Consistently with the primary windings of 5 transformers

B: a thyristor 37 is switched on, the cathode of which is grounded, and the control electrode is connected to the source of the queuing signal. In parallel with this thyristor, a shunt resistance 38 and a capacitor 39 are connected. The limiting resistance 40 is sequentially connected to the latter.

The device can be used to turn on any desired number of thyristors.

Instead of the thyristor 37, it is possible to include any switching element (for example, an electron lamla) providing the required speed of the circuit.

In the initial state, the trigger circuit is at a potential equal to the potential at the anode of the upper thyristor 13. The voltage applied to the trigger circuit (equal to the voltage on the series-connected thyristors 13-16) is divided between capacitances 6, 7, 8 and 39 the values of shunting resistances are 9, 10, 11 and 38, respectively. The voltage on the thyristor 37 is determined by the magnitude of the resistance 38. When an opening pulse is applied to the control electrode of the thyristor, the latter switches to the open state. The capacitor 39 begins to discharge through the thyristor and the limiting resistance 40. With the beginning of the discharge of this capacitor, the potential in the opening circuit is redistributed, and the capacitances 6, 7 to 8 are at a higher potential. The redistribution of the potential causes a current in the opening value that charges the capacitors 6, 7, 8 and, passing through the primary windings 5 of the pulse transformers / -4, induces current pulses in the secondary windings 12. The pulses simultaneously arrive at the control electrodes of the thyristors 13-16 and bring them to the open state.

Due to the fact that the trigger signal controls only one switching element (thyristor), the power source

the trigger signal is many times less than in the known device. No high voltage isolation is required between the trigger source and the series-connected thyristors.

Through the auxiliary switching element (thyristor) the power current does not flow, therefore, a low-current element can be used as a switching element. All the main thyristors 13-16 work. Under the same conditions.

Subject invention

Claims (2)

1. A device for simultaneously switching on p-series-connected thyristors, containing a switching element, for example a thyristor, to the control electrode of which a source of trigger pulses is connected; p-pulse transformers, the primary windings of which are connected in series through a chain of parallel-connected capacitors and resistances, and the secondary windings are bridged by diodes and connected through a resistance between the control electrode and the cathode of the corresponding thyristor, in order to reduce the source power of the trigger signals , the output of the primary winding of the nth transformer is connected to the anode of the switching thyristor, the cathode of which is grounded, while parallel to the said thyristor on Yucheno resistance shunted by a serial RC-chain. 2. A device according to claim 1, characterized in that, in order to evenly distribute the stationary voltage of the restoration on series-connected thyristors, a chain of series-connected resistances is connected in parallel with them, an RC-chain of series-connected resistances and a condenser are connected in parallel to each of them.