SU894834A1 - Pulse generator - Google Patents

Description

I

The invention relates to a pulse technique and can be used in devices that convert changes in the parameters of the oscillating circuit of a high-frequency generator, resulting from an external effect, into a pulse of a given duration.

Known pulse generators containing two transistors and the time of the driving circuit, the resistor of which is shunted by the GP diode.

However, these generators continuously produce square-wave pulses and cannot be used to convert variations in oscillating circuit parameters into pulses.

Of the known, the closest in technical essence to the present invention is a high-frequency generator, which, if a high-frequency oscillation fails due to external influence, the oscillation circuit is shielded from the coil

CONNECTIONS, produces a rectangular pulse and contains a transistor, a bias resistor, a coupling capacitor, a limiting resistor and a shunt capacitor, the first terminals of which are connected to the generator output, an oscillating circuit of the parallel-connected capacitor and the primary winding of the transformer, connected between the collector of the transistor and the first terminals a limiting resistor and a shunt capacitor, the second terminals of which are connected respectively to the potential, social bus of the power source and

15 to a common bus connected to the first terminal of the coupling capacitor and the emitter of the transistor, the base of which is connected via the secondary winding of the transformer to the second terminals of the coupling capacitor and bias resistor 2.

A disadvantage of the known device is its limited scope.

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in addition, it does not respond to short-term external influences.

The purpose of the invention is to expand the scope.

The goal is achieved by the fact that a diode and a time setting time are entered into the generator. A capacitor is connected between the generator output and the first output of the bias resistor, and a time capacitor between the first output of the bias resistor and the common bus.

The drawing shows a circuit diagram of the device.

The pulse generator contains a transistor 1, an oscillating circuit 2, a limiting resistor 3 connected to the potential bus C of the power source, with the transformer secondary winding 5 connected between the base of transistor 1 and the second terminals of the bias resistors 6 and the separation capacitor 7 bypassing capacitor 8 connected between the common bus 9 and output 10 of the generator, diode 11 and time setting capacitor 12.

The device works as follows. in a way.

In the mode of generating high-frequency oscillations, a constant voltage is present at the output 10 of the device, the value of which is V - 90% of the voltage on the bus l of the power supply. As a result of any external influence, for example, shielding the oscillating circuit 2 from the feedback winding 5, the high-frequency oscillations fail. In this case, the current through the bias resistor 6 causes the transistor 1 to open to saturation. The voltage across its collector and device output 10 drops sharply to zero. After cessation of the effect, the transistor is held open for some time. This time is determined by the discharge time of the time of the driving capacitor 12 through the bias resistor 6. After discharge, the time of the driving capacitor 12, the device enters the mode of generating high-frequency oscillations. The voltage at its output 10 increases dramatically and reaches its previous value,

The device responds to short-term external influences, the duration of which is commensurate with the period of high-frequency oscillations. When a short-term external action is observed, the device generates a rectangular impulse of a given duration, which allows it to expand its area of application.

Claims (2)

1. USSR author's certificate number 486457, cl. And 03 K 3/28, 1973. 2.Agaykin D.N. and others. Sensors of control and regulation. M., Mechanical Engineering, 1965, p. 127, ris.1.116 (prototype). II W ten 12 L J- 7 eight