RU1836791C - Device for thyristor control - Google Patents

Abstract

The inventive base for connecting the triggering pulses is the base of the first transistor 1, the collector of which is connected through a resistor 3 to the first output of the power source, connected through a resistor 6 to the second output of the first capacitor, the cathode of the diode 5 and the base of the second transistor 7. whose collector is resistor 8 is connected to the second output of the power source, the common output of which is connected to the emitters of the first and second transistors and the diode anode connected to the collector of the second transistor through p consequently included a second capacitor 9 and the primary winding of the pulse transformer 10, terminals of the secondary winding 11 is used as output terminals of the device. 2 ill.

Description

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The invention relates to electrical engineering and can be used to control thyristors in thyristor voltage regulators.

The aim of the invention is to increase the reliability and noise immunity of the system, ensuring the formation of powerful control pulses with stable parameters when powered by low power sources.

Fig. 1 is a diagram of an apparatus for controlling thyristors; figure 2 is a diagram showing the operation of the circuit.

The thyristor control device (Fig. 1) contains a transistor 1, to the input of which a triggering pulse is supplied, and a chain of two series-connected resistors 2 and 3 is connected to the collector circuit to the connection point of which one terminal of the capacitor 4 is connected, and its other terminal is connected to the connection point of the diode 5, the resistor 6. of the base of the transistor 7, to the collector of which a resistor 8 and a capacitor 9 are connected, the other terminal of which is connected to the primary winding of the pulse transformer 10, the control pulse is removed from the winding 11, O. Braz stroystvo operates as follows, In the absence of the trigger pulse at the input of the transistor 1 wife charge capacitors 4 and 9 with the polarity indicated in the diagram. The current flowing through the resistor 6 creates a direct voltage on the diode 5, which creates a blocking potential at the input of the transistor 7, which eliminates its unlocking by interference signals.

At the moment the trigger pulse arrives at the input of the transistor. 1, a discharge circuit is formed: capacitor 4 — resistor 2 — transistor 1 — emitter — base of transistor 7. The transistor 7 opens with the discharge current of capacitor 4 and a discharge circuit of capacitor 9 is formed through the primary winding of the pulse transformer 10. During the discharge process, a control pulse is generated on its secondary winding 11 of the pulse transformer 10 (Fig. 2e). The duration of the control pulse depends on the resistance value of the resistor 2 and the capacitance of the capacitor 4. The parameters of the control pulses (edge duration, amplitude, duration) are independent of the quality of the voltage of the power source and the shape of the trigger pulse. The control pulse is generated mainly by the energy stored by capacitors 4 and 9. This property of the circuit allows the use of a low power supply with a large ripple coefficient of the output voltage.

In the circuit, transistors with different conductivity can be used. For this, it is necessary to switch the terminals of diode 5 and change the polarity of the voltage of the power source.

Claims (1)

SUMMARY OF THE INVENTION A thyristor control device comprising a first transistor, the base of which is designed to be connected to a source of triggering pulses, a first resistor whose first output is connected to the first output of the first capacitor, and a diode connected between the base and the emitter of the second transistor, the emitter of which is designed to connect to the first terminal of the power supply, for which neither the second terminal of which the first terminal of the second resistor is designed, the second terminal of which is connected to the collector of a transistor, between the collector and emitter of which a second capacitor is connected in series and the primary winding of a pulse transformer, the terminals of the secondary winding of which are used as the output terminals of the device, oh, I repeat 1 that, in order to increase reliability and noise immunity, to ensure the formation of powerful control pulses with stable parameters when powered from low power sources, the third and fourth resistors are introduced, the first conclusions of which are combined and intended A voltage source is connected to the first output of the voltage source. The emitters of the first and second transistors are intended to be connected to the second output. The base of the second transistor is connected to the second terminals of the third resistor of the first capacitor, the first terminal of which is connected to the second terminal of the fourth resistor, and the second terminal of the first a resistor connected to the collector of the first transistor. . 6) f 1 FiЈ2