SU1664123A3 - Pulse generator - Google Patents

Abstract

The invention relates to high-voltage impulse technology and can be intended for use in electrophysical devices for special purposes, in particular in devices for modifying and treating the surface of solid materials with electric discharge, and allows for increasing reliability and expanding the field of application. The device contains a power supply unit, a buffer diode, a working capacitor, thyristors, dinistor relaxators, a pulse transformer. 1 hp f-ly, 2 ill.

Description

The invention relates to high-voltage impulse technology and is intended for use in special purpose electrophysical devices, in particular in devices for modifying and treating the surface of solid materials with electrical discharge.

The purpose of the invention is to increase reliability and expand the scope.

Figure 1 presents the scheme of the pulse generator; Figure 2 shows stress plots.

The pulse generator contains a power supply unit 1, a buffer diode 2. a working capacitor 3, thyristors 4 and 5 with dinistor relaxators 6 and 7 in the control circuits, a pulse transformer 8 with two primary windings 9 and 10 and a high-voltage secondary winding 11 and adjustable chokes 12 and 13.

The dinistor relaxators 6 and 7 consist of a dyno 14, a capacitor 15 and resistors 16 and 17.

Pulse generator operates as follows.

In the initial state, the thyristors 4 and 5 and the 14 are closed. At the initial moment with the appearance of a pack of charge pulses produced by the pulsed power supply unit 1, the process of charging the working capacitance 3 through the circuit begins: Ui, buffer diode 2, primary winding 9 of the pulse transformer 8, and 0gf. With the arrival of the last pulse of the stack, the process of charging the working tank 3 is completed. The capacitance 3 at this time is charged before the voltage UcHJi.

The dynistor relaxator 7 generates a thyristor control pulse 5, which (Fig. 2) is produced with a certain time delay tsafl.l with respect to the end of the last pulse of the packet. The time delay is necessary to complete the transients associated with the charge of the working capacitance 3. With the arrival of the control pulse, the thyristor 5 opens across the control electrode and the working capacitance 3 opens along the circuit: capacitance 3, choke 13, thyristor 5, primary winding 9 pulse transformer 8, capacity 3. Due to the smallness of the inductances of the regulator

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My throttles 12 and 13, the discharge process is pulsed with a very steep leading edge and the maximum possible for a given generator.

When the thyristor 5 is open, capacitance 3, choke 13 and winding 19 represent an oscillating system, therefore the discharge process goes into the process of recharging operating capacitance 3 ,. The thyristor 5 starts locking as soon as the capacitance 3 is completely discharged and the voltage on the capacitance 3 becomes zero. The process of locking the thyristor is not instantaneous, but has a finite amount that is sufficient to recharge the working capacity 3. By the time of capacity 3, the thyristor 5 is completely locked. The first cycle of the device is completed. On the secondary step-up winding of the transformer 8, a high-voltage pulse of positive polarity is obtained, the duration of which is determined by the values of capacitance 3, inductance of drossel 13 and winding 9.

The second cycle starts from the moment the dinistor relaxer triggers, which produces a thyristor control impulse 4. This impulse is generated with a delay, i.e. and stability in the work of the generator. The control pulse opens the thyristor 4 through the control electrode and the discharge of the working capacitance 3 along the circuit: capacitance, primary winding 9 of the pulse transformer 8, thyristor 4, choke 12, capacitance 3.

When the voltage on the capacitance 3 decreases to zero, the thyristor 4 begins to close. The next recharge of capacitance 3 begins due to the continuation of the oscillatory process (capacitance 3, winding 10, throttle 12), and also due to the action of the next batch of pulses of power supply unit 1 to partially compensate for the loss of electrical energy. As a result, capacitance 3 is charged before the initial charge, the thyristor is locked, and the circuit returns to its original state. The secondary winding of the transformer 8 receives a high voltage pulse of negative polarity and

Claims (2)

1. An impulse generator containing a power supply unit, a buffer diode, a working capacitance, thyristors, the first of which is connected by a cathode to a common power supply bus, The first output of the working capacitance is associated with the anode of the first thyristor and the cathode of the second thyristor, characterized in that, in order to increase the reliability of operation and expand the scope, it further comprises dinistor relaxators and a pulse transformer, with the second output of the working capacitance through the first primary winding a pulse transformer is associated with a common the power supply bus and through the primary winding with the first output of the first dynistor relaxator and with the anode of the second thyristor, the second output of the first dynistor relaxer is connected to the control electrode of the second thyristor, the cathode of which is additionally connected to the third output of the first dynistor relaxator and the cathode of the buffer diode, the anode of which connected to pulse output the power supply unit and the first output of the second dynistor relaxator, the second output of which is connected to the control electrode of the first thyristor, and the third output of the second dinistor relaxator is connected to the common bus of the power supply, and the secondary windings of the pulse transformer are the output of a pulse generator. 2. The generator according to claim 1, characterized in that, in order to expand the functionality, it further comprises first and second adjustable chokes, the first findings of which are interconnected and connected with the first 5 the output of the working capacity and the cathode of the buffer diode, the second output of the first adjustable throttle is connected to the cathode of the second thyristor and the third output of the second dinistor relaxator, and the second output 0 of the second adjustable throttle is connected to the anode of the first thyristor. sixteen m And in C about 580 V L 17 t% 1} upr. Fig z