SU932599A1 - Blocking oscillator - Google Patents

Description

I

The invention relates to a pulse technique and can be used in the output stages of phase control circuits, as well as in automation and remote control devices that do not require a pulse of a strictly rectangular shape.

A blocking generator is known, comprising a transistor, a pulse transformer with windings: main, additional and feedback Q.

The disadvantage of such a block generator is the high switching currents of the transistor, since the avalanche-like locking of the transistor occurs with a saturated core of a pulse transformer.

A blocking generator is known, comprising a transistor, a pulse transformer, an emitter time, a driver capacitor, and a circuit for additional charge, the driver clock 2.

The disadvantage of such a blocking generator operating in the standby mode is a change in the duration of the generated pulse with a change in the frequency of the triggering pulses.

The purpose of the invention is to provide a constant duration of the generated pulse when the frequency of the triggering pulses changes.

ten

The goal is achieved by the fact that a B-block I-generator containing a transistor j in the emitter circuit of which a capacitor is connected, a pulse transformer with collector and feedback windings, one feedback winding lead connected to the corresponding power supply bus, two diodes are inserted connected subsequently between the emitter and the base of the transistor in the direction opposite to the direction of the base-emitter junction of the transistor, and the other output of the windings

A feedback connection is connected to the coupling of the diode.

On the line heh, the blocking generator generator circuit is shown in principle.

The blocking generator contains a transistor 1, a transformer 2 having a collector 3, an output C and a feedback 5 winding capacitor 6 in the emitter circuit of transistor 1, diodes 7 and 8 connected between the emitter and the base of transistor 1, and resistor 9.

The blocking generator operates as follows.

When the next trigger pulse arrives, transistor 1 opens and, due to the positive feedback acting on the circuit, winding 5 of transformer 2 — capacitor 6 — transition emitter — base of transistor -1 — diode 8 — resistor 9, winding 5 of transformer 2, becomes saturated. The emitter current of transistor 1 charges the capacitor b, and as the voltage across the capacitor 6 increases, the effect of the positive feedback decreases. When the voltage on the capacitor 6 is close to the voltage on the winding 5 of the transformer 2, the transistor 1 locks into an avalanche-like manner.

Since the active resistance of the winding. The feedback is small, the discharge of the capacitor b proceeds quickly, so that through a short-term

interval circuit is ready for the next arrival of the trigger pulse.

This blocking generator provides a constant duration of the generated pulse with a change in frequency, due to the full discharge of the capacitor by the time the next trigger pulse arrives.

Claims (2)

1. Authors certificate of the USSR N k2SJ32, cl. H 03 K 3/30, 1972. 2. USSR author's certificate number 426309, cl. H 03 K 3/30, 1972 (prototype).