SU529546A1 - Pulse Generator - Google Patents

Description

(54) GENERATOR. SERIES PULSES

one

The invention relates to radio engineering and can be used in control devices for valve converters.

One of the well-known generators of the IM series (pulses contains a multivibrator with a transformer feedback, the source of control pulses is l.

However, this generator has a comparatively low efficiency. and the dependence of the pulse duration on the values of the load.

Also known is a series of pulses generator containing a source of control pulses of a series duration, a multivibrator made on two transistors with transformer feedback, in the emitter circuit of the first of which a bias diode G21 is installed.

Hh d

However, the local generator has some instability of the duration of the last pulse in the series.

The purpose of the invention is to increase the stability of the duration of the last pulse in the series.

To do this, a thyristor is connected to the pulse series generator, which is connected in series with the transformer winding into the collector circuit of the second transistor, while the control electrode of the thyristor is connected to the pulse duration control pulse source.

The drawing shows the principal electrical circuit of the pulse train generator.

The pulse series generator contains a source of control pulses for the series (not shown in the diagram), a multivibrator made of transistors 1, 2 and a transformer 3 having windings 4, 5, 6, 7 and 8. A bias diode 9 is connected to the emitter circuit of transistor 2.

The thyristor 10 is connected to the collector circuit of transistor 1 in series with the winding 5. The control electrode of the thyristor 10 is connected to the terminal 11 of the source of the control pulses;

The pulse train generator works as follows.

In standby mode, the thyristor 1O is closed, and the collector circuit of the transistor 1 razomk

yuta The transistor 2 is closed by the voltage of the automatic bias on the diode 9.

At the moment the input signal is supplied to terminal 11, the thyristor 10 is opened, SWITCHING the collector circuit of transistor 1, which then turns on, and the magnetization reversal of the core of transformer 3 begins at the limiting hysteresis loop,

A full supply voltage is applied to the winding 5 of the transformer 3, and a rectangular pulse is removed from the output winding 8.

When the core of the transformer 3 is saturated, the switching of the transistor 1 and 2 begins as in a conventional Roer generator, and the transistor 1 closes and the transistor 2 opens. The remagnetization of the core of the transformer 3 begins in the opposite direction. In this case, the full voltage of the power source is applied to the winding b, and a rectangular pulse of opposite polarity is removed from the output winding 8.

Claims (2)

1. Author's certificate of the USSR No. 287108, M. 03 K 3/02, dated January 29, 1969 (equivalent). 2.Authorial USSR No. 291299, M.Kl.N 02 R 13/16, dated 12.05.1968 (the prototype ;.