SU970653A1 - Pulse shaper - Google Patents

Description

The invention relates to a pulse technique and can be used in control devices and control of semiconductor energy converters. The known blocking generator circuit in which the output transformer circuit of the transformer is opened is introduced by introducing thyristor 1. However, for this blocking generator circuit, a locking pulse is required to turn on the thyristor, which reduces the reliability of the circuit. A blocking generator is known on a transistor connected according to a circuit with an emitter, which contains an amplifier on another transistor whose collector is connected to the base of the transistor of the blocking generator 2. However, if there is interference in the transformer windings, the known blocking generator is started. The purpose of the invention is to improve the premise resistance. The goal is achieved by the fact that the block generator contains the first transistor of a pnp type, the collector of which is connected to the first terminal of the collector winding of the transformer, the emitter with a common bus, the base of the transistor is connected to the second terminal of the collector winding through series-connected capacitor and feedback winding - to the common bus, the second transistor ppn type, the emitter of which is connected to the common bus, the base to the source of trigger signals, resistors, introduced an additional capacitor , diode and additional transistor of pn type, the collector of which is connected to the second terminal of the collector winding of the transformer and the first plate of the additional capacitor, the emitter to the negative power supply bus, the base through the second resistor to the collector of the second transistor, the base of the first transistor 3970

pa is connected to the cathode of the diode, the anode of which is connected to the collector of the second transistor, the base of which through the third resistor is connected to the negative power supply bus, the second plate of the additional capacitor is connected to the common bus.

The drawing shows a circuit diagram of the proposed blocking generator.

The block generator contains the first transistor 1, the first, second resistors 2 and 3, respectively, the second transistor, additional capacitor 5, third resistor 6, capacitor 7v feedback winding 8, additional transistor 9 blocking generator, collector winding 10 of the transformer blocking generator diode

eleven.

The blocking generator operates as follows.

In the initial position, the transistor is open, and the transistor 11 is closed. At the same time, an additional transistor 9 is opened, through the collector-emitter circuit of which the charge of the additional capacitor 5 is carried out to the voltage of the power source. When the transistor 1 is closed, the additional capacitor 5 is disconnected from the power source due to the presence of the transistor 9 and diode 11. At the same time, the process of forming the output pulses with a steep front begins, due to the positive positive feedback between the windings 8 and 10. The duration of the pulse packet depends on the stored energy in the capacitor 5.

In the proposed scheme, the no-i mech pulses induced in the winding 8 do not start the blocking oscillator circuit.

Claims (2)

1. USSR Author's Certificate No. 303717, cl. H 03 K 3/30, 1968. 2. USSR author's certificate N 765390, cl. H 03 K 3/30, 1978 (prototype), - ABOUT // iX-L-  7 one