SU600700A1 - Blocking oscillator - Google Patents

Description

one

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

Known block-generators 1, 2.

One of the known blocking generators has a positive feedback formed by the transformer winding and the time by the driving capacitor. This blocking generator has a low frequency stability of pulses 1.

The closest solution to the invention of the TechCELIM is a blocking genset containing a transistor, a pulse transformer,: time setting 7 C-chain. a diode and a resistor, in which the collector of the transistor is through the transformer's nervous winding, and the base is connected via a successively connected secondary winding of the transformer and a resistor of the master / C-chain connected to the power supply bus, the transistor emitter and one of the diode terminals are connected to a common Wing 2.

However, this block generator has a low cost, great DURATION

the leading edge of pulses, the inherent stability of the frequency of their follow, amplitude and duration.

The purpose of the invention is to increase the efficiency of the blocking generator, reduce the duration of the leading edge of pulses and increase the frequency of the wall i.h follow, amplitude and dlitslityust G.

To do this, in the blocking hsierator containing a transistor, a pulse transformer, Time setting / C-chain. a diode and a resistor, in which the collector of the transistor is through the primary winding of the transformer, and the base through the secondary winding of an unformer and the time of the driver and the plug of the transistor, and the emitter of the transistor and one of the common diode connections; bus, a supplementary diode is inserted, which by one output and connected to the connection point of the resistor vsm of the setting At the C-chain with the secondary winding of the transformer, to which also the switches are the second output of the diode, the time capacitor The common / C-circuit is connected between the connection point of the base of the transistor and the secondary winding of the transformer H by another output of an additional diode, between which and the common busbar a resistor is connected.

In the drawing, 1, a circuit of the pre-blocking generator is presented.

The blocking generator contains a transistor 1, an emulsion transformer 2, a driver time / C-chain consisting of a resistor 3 and a capacitor 4, a diode 5 and a resistor 6. The collector of transistor 1 through the primary winding 7 of the transformer 2, and the base through the serially connected secondary winding 8 of the transformer 2 and the resistor 3, the driver of the C-circuit, are connected to the power supply bus 9. The emitter of the transistor 1 "one of the conclusions of the diode 5 is connected to the common bus 10.

A donor diode 11 is inserted into the blocking generator. It is connected to the connection point of the resistor 3 by one output, it / s-tsenochka with the secondary winding 8 of the transformer 2, to which the second nerve diode is also connected. The capacitor 4 time setting ./ C-tsenki1KI connected between the point 1 base of the transistor 1 to the secondary winding 8 of the transformer 2 and the other output of the additional diode 11, between which and the common bus 10 includes a resistor 6.

The blocking generator works as follows.

The formation of pulses corresponds to the state of the circuit when the capacitor 4 is discharged, and through diode 5 a positive feedback acts. The voltage of the winding 8 is applied to the emitter-base junction of transistor 1, providing a constant base current value. The closed state of diode 11 eliminates the charge of capacitor 4 during the pulse shaping time. This mode is maintained as long as the magnetizing current has a certain rise rate, and the transistor 1 is in the saturated mode, and a constant voltage is maintained on the winding 8. This, in a way, provides conditions for the isolation of pulse generation from the charge current and reduces the duration of a non-intermediate front and increases the stability of the amplitude and duration of the generated pulses.

At the moment of locking the transistor 1, the release of energy accumulated in the magnetic field of transformer 2 begins. On its winding 8, a reverse polarity voltage is induced — a backward pulse, under which the transistor 1 is kept in the closed state, and a charge time occurs capacitor 4 through diode II. At the end of the action of the back surge pulse, the capacitor 4 is discharged through resistors 3 and 6, and thus a pause is formed between the pulses.

The presence of a separate charge circuit, the time of the driving capacitor 4 with the transistor 1 closed and the use of an "backward ejection pulse" for energy charging ensures an increase in the stability of the frequency of the following pulses and an increase in the efficiency of the blocking generator.

The introduction of two separate prices, one for feedback, and the other for charging, the time of the driving capacitor 4 using diodes 5, 11 and a resistor 6, the separation of the processes in them over time favorably distinguishes the proposed blocking generator from the prototype, since it eliminates the mutual The effect of the charge current on the formation of the pulse and the rate of change of the magnetizing current is determined by the charge capacitance 4.

Claims (2)

1. Konnshin B.N. Investigation of the schemes of blocking generators with increased frequency stability - “Radio engineering, 1970, No. 10, p. 57-61, fig. 3 2. The UK patent number 1308578, cl. NTZ, 1973.