SU566319A1 - Blocking generator - Google Patents

Description

one

The invention relates to radio engineering and can be used in devices of pulse technology.

Known blocking generator, containing a pulse transformer, a transistor connected according to the scheme with a common base, the emitter of which is connected to one of the conclusions of the primary winding of the pulse - a transformer. matora, and two sources of current 1.

However, this blocking generator cannot operate in the two excitation thresholds.

The purpose of the invention is to obtain two thresholds of self-excitation.

To do this, in the blocking gatekeeper, the current sources are interconnected via a separating element. for example, a diode and a secondary winding of a pulse transformer, one of the sources directly connected to the collector of the transistor, and the other to another B111 drive of the primary winding of the pulse trgmsformer and a capacitor, the second terminal of which is connected to the common bus.

In the drawing, here is the 1a electrical circuit diagram of the blocking generator.

It contains a pulse transformer 1, transistor 2), a turned on Е1сС1 according to a circuit with a common base, the emitter of which is connected to one of the terminals of the primary winding 3 of the pulse transformer 1, and two, current sources 4 and 5.

The current sources 4 and 5 are connected to each other via a separating element, for example, diode 6, and the second: 1 primary winding 7 of the pulse transformer 1. The current source 4 is connected directly to the collector of transistor 2, and the current source 5 with a different output of the primary winding 3 of the pulse transformer 1) and 1 and a capacitor 8, the second terminal of which is connected to the common tire.

The blocking generator operates as follows.

When the input current of the current source 4 is less than the power source of the current 5, the transistor 2 is at the same time. The fall . neither between the collector and the emittagism of transistor 2 composition.1 em not more than ten

millivolt, and the voltage drop, at which the separation element (diode) 6 begins to conduct, is significantly greater, therefore, the diode 6 does not conduct current.

At dsh; the input current of the source 4 is magnitude - SS, where jn is the current source current 5, оС is the current transfer coefficient of the transistor, connected according to the circuit. Me with a common base, the transistor 2 goes into active mode. The voltage on its collector with a further increase in current increases rapidly, and diode 6 begins to pass current. A current-to-secondary winding 7 of the pulse transformer 1 begins to flow, the EMF in the primary winding 3 so that the emitter current of the transistor 2 decreases. This leads to a decrease in the collector current and a greater increase in current through the winding 7.

A regenerative process occurs, at which the transistor 2 is completely closed, and all current flows through the winding .7. A pulse appears on the output winding 9.

Claims (1)

1. Yakovlev, V.N., Impulse Generators on Transistors, Technika, 1966, p. 161.