SU1511828A1 - Shaper of thyristor control pulses - Google Patents

Abstract

The invention relates to a converter technique and can be used to generate pulses for controlling thyristors of high power converters. The aim of the invention is to reduce the weight and size of the device due to a more complete magnetic reversal of the output transformer core. This goal is achieved in that the remagnetization winding 3 of the output transformer 2 is connected to a constant voltage source 16 via a transistor switch 9. When the device is turned on, the front of the pulse of the optimal shape necessary to turn on the thyristor is formed by discharging the capacitor 14 through a diode 13 and transistor 1 on the section of the primary winding 3 of the output transformer 2. 1 Il.

Description

3151

The invention relates to converting a technique and can be used to generate thyristor control pulses for high-power high-voltage static converters of electrical energy having a coherent capacitive II series and thyristor connection and required. at high, anode growth rates, thyristor current, the steep front of control pulses of optimal shape with the forming and supporting parts.

The purpose of an acquisition is to reduce the mass and size of the device. The drawing shows a schematic diagram of the proposed thyristor control pulse shaper.

: ophmpoBaTeHb thyristor control pulses contains a transistor I, an output transformer 2 with the first primary, consisting of two sections 3 and 4j reversing 5 and a secondary 6 windings, a resistor 7 and a current limiting resistor 8, an optical 9 with an LED 10 and a phototransistor 11, the first 12 and second 13 diodes, the capacitor 14, the source 15 of the trigger signals and the source 16 of the constant voltage.

The base of the transistor J is connected to the output of the source 15 triggering signals. The minus of the source 16 constant Hoi o voltage is connected to the emitter of transistor 1, the beginning of the nonremagnetizing winding 5 of the output transformer 2, the cathode of the LED 10 of the opto pair 9 and the first output of the capacitor 14. Plus the source 16 is constant. the voltage is connected to the first output of the resistor 7. The second output of the first resistor 7 is connected to the beginning of the second PCR winding 4 of the output transformer 2. and the collector of the phototransistor 11 of the optocoupler 9. The end of the second primary winding 4 of the output transformer 2 is connected to the beginning of the first primary winding 3 of the output transformer 2 and the cathode of the second diode 13. The anode of the second diode 13 connectors with the cathode of the first diode 12 and the second output of the capacitor 14, the end of the remagnetization winding 5 of the output transformer 2 is connected to the phototransmitter emitter I1 torus photocoupler 9 and to the anode of the first diode 12.

The collector of the transistor 1 is connected to the end of the first primary winding 3 of the outgoing transformer 2 and the first output of the second resistor 8. The second output of the current-limiting resistor 8 is connected to the anode of the LED 10 of the optocoupler 9.

The thyristor control pulse shaper operates as follows.

When a constant voltage source 16 is connected, the light-emitting diode 10 and the phototransistor 11 of the optocoupler 9 are turned on at the base transition of transistor 1 before the trigger signal arrives. The capacitor 14 is charged before the voltage of the constant voltage source 16 is: plus the constant voltage source 16 , the first resistor 7, the phototransistor 11 of the optocoupler 9, the first diode 12, the capacitor 14, minus the source 16 constant voltage. At the same time, a current flows through the remagnetizing winding 5 of the output transformer 2 along the circuit: plus a constant voltage source 16, the first resistor 7, the phototransistor 11 of the optocoupler 9, the remagnetization winding

5 output transformer 2, minus constant voltage source 16. When the current passes through the magnetising winding 5 of the output transformer 2, the state of the magnetic circuit of this transformer changes. When a trigger signal arrives at the base transition of the transistor, it opens. Capacitor

14 is discharged along the circuit; capacitor 14, second diode 13, primary winding section 3 of output transformer 2, transistor 1, capacitor 14. At the same time, on the secondary winding

At the output of the transformer 2, the forcing of the second part of the control pulse with a steep front is formed. After the discharge of the capacitor 14 to a certain voltage and until the end of the trigger signal at the base transition of the transistor 1 from the source 16 constant-voltage through the first resistor 7, the primary winding

3, 4 of the output transformer 2, the transistor 1 flows a current, which forms on the secondary winding 6 of the output transformer 2, supports the powerful part of the control pulse of the thyristor. During the formation of the thyristor control pulse, the state of the magnetic circuit of the output transformer 2 changes. At the end of the triggering signal, the thyristor 1 turns off, the LED 10 and the phototransistor 11 of the optocoupler 9 turn on, and the processes in the driver are repeated In the proposed thyristor control pulse generator, the state of the output magnetic circuit changes transformer 2 occurs on the full limit cycle of the hysteresis loop.

During the preparation of the pulse shaper to generate a next pulse, the remagnetization winding of the output transformer is connected in parallel to the forming capacitor, which, having a small capacitance value, does not limit the time of magnetization of the output transformer

The use of the proposed pulse shaper: thyristor control provides a reduction in the mass, size and cost of the output transformer by almost 3 times.

Claims (2)

Invention Formula . The thyristor control pulse shaper containing a constant voltage source, the positive terminal of which is connected to the beginning of the primary winding of the output transformer via a resistor, which is connected to the remagnelling winding, and the end of the primary winding of the output transformer is connected to the negative terminal of the transistor. voltage and with one output of the source of triggering signals, with a different output of which  The base of the transistor is connected, the transistor switch, the control input of which is connected to the collector of the transistor, the first diode, the cathode of which is connected to one capacitor, and the secondary leads of the output transformer are connected to the control, transition of the corresponding thyristor, characterized in that in order to reduce the mass and dimensions of the pulse former due to a more complete magnetization reversal of the core of the output transformer, a second diode was introduced, and the primary winding of the output transistor the formatter is made in the form of two sections in series and consistently, the beginning of the primary winding of the output transformer is connected to the thyristor switch collector, the emitter of which is connected to the end of the remagnetization winding and the anode of the first diode, the cathode of which is connected to the anode of the second diode, the cathode is connected to the middle of the primary the windings of the output transformer, and the beginning of the magnetizing winding and the other terminal of the capacitor are connected to the negative terminal of the constant voltage source. 2. The pulse shaper. Claim 1, characterized in that the transistor switch is made in the form of a transistor optocoupler, the anode of the LED of which is the control input of the transistor switch and is connected to the collector of the transistor through a current-limiting resistor and the cathode to the negative terminal of the constant-voltage source.