SU400979A1 - BLOCKING GENERATOR - Google Patents

Description

one

The invention relates to an immersion technique and can be used as a generator of rectangular pulses.

The known blocking generator, made on a transformer and two transistors - main and additional - with a positive feedback feedback circuit, containing a master / C-circuit time, the midpoint of which is connected to the base of the additional transistor, has a complex transformer.

In order to simplify the construction of a transformer in the proposed blocking generator, an additional sequence U C- is connected between the base of the main transistor and the positive feedback winding; a circuit whose midpoint is connected to the collector of the additional transistor.

In the drawing, the electrical circuit of the proposed blocking generator is shown in principle.

It contains a transformer /, the main traizistor 2, an additional transistor 3 and two times specifying the Snepi. The first / C-circuit consists of a capacitor 4 and a resistor 5. The junction point of the alarm depot 4 and the resistor 5 is connected to the base of the transistor 3. The second time the driving C-circuit consists of the capacitor 6 and the resistor 7. The junction point

the capacitor 6 and the resistor 7 is connected to the collector of the transistor 3.

When a start-up pulse of negative polarity arrives at the base of transistor 2

the latter opens and goes into saturation mode. Capacitor 8 fills the role of a forcing element, which accelerates the formation of the pulse front. The voltage on the winding 9 feedback causes

the capacitor charge is 4–6, and the charge current enters the base of transistor 2, keeping it in saturation mode. The parameters of the / C-circuits are chosen so that the charge of the capacitor 6 occurs earlier than the charge.

the capacitor 4, therefore the collector junction of the additional transistor 5 is shifted in the opposite direction.

At the initial moment the transistor 5 is locked due to the negative bias

on its emitter, which is supplied from the slider of the variable resistor 10. As capacitor 4 charges, the locking bias between the base and emitter of transistor 3 decreases, and at the time of changing its sign to the opposite, the emitter junction 5 unlocks. 4, its current drops to zero, the sending base current of transistor 2 decreases.

current to the base of transistor 3 causes proportional3

rational increase of its collector current, and this current through the charged capacitor 6 enters the baseline of transistor 2. The direction of the current corresponds to the locking of transistor 2, and after the time required for resorption of an excess charge in the base, transistor 2 leaves the saturation mode , a pulse on the output winding of the transformer / ends.

A C-circuit consisting of a capacitor 4 and a resistor 5: is the time setting and, together with the variable resistor 10, determines the duration of the formed pulse.

The C-circuit, consisting of a capacitor 6 and a resistor 7, ensures that transistor 3 operates in an active mode, in which the base current is amplified, due to the fact that the voltage on the capacitor 6 is always greater than the voltage of the capacitor 4.

The blocking generator circuit also includes capacitors 12 and 13, resistors 14, 15 and 16, load resistor 17, diodes 18-21, the primary winding 22 of transformer 1.

PRIORITY 3 ABOUT AND

A blocking generator made on a transformer of two transistors — the main one and an additional one — with a collector-10 base circuit of positive feedback, containing a master / C-circuit time, the midpoint of which is connected to the base of the additional transistor, characterized in constructions

15, between the base of the main transistor and the positive feedback winding is connected an additionally introduced serial C-circuit, the midpoint of which is connected to the collector of the additional transistor.