SU1226611A1 - Pulser - Google Patents

Abstract

The invention relates to a pulse technique and can be used in industrial automation. The purpose of the invention is the formation of a burst of pulses amplitude modulated by a relatively slowly varying input voltage, achieved by providing multiple switching of a threshold key on a single junction. transistor. The device contains a full-wave rectifier 1 voltage, a single junction transistor 2, a load 5, a stat-bilitron 9, resistors and capacitors. In order to achieve the delivered target, a transistor is inserted. I il. WITH

Description

one

The invention relates to a pulse technique and can be used in industrial automation.

The purpose of the invention is the formation of a burst of pulses amplitude modulated by a relatively slowly varying input pitch by providing multiple switching of a threshold key at a single junction transistor.

The drawing shows a circuit diagram of the device

The pulse shaper contains a two-full-wave rectifier I at the low voltage 5 single-transition resistor (OPT) 2, the emitter of which is connected to the middle point; the secondary circuit from, resistor 3 and capacitor 4, the first base of OPT 2 is connected via load 5 to the output of capacitor 4 and to the first output terminal of rectifier 1, the second output terminal of which through the first resistor 6 is connected to the emitter of transistor 7, the base of which is connected to the output of the resistor 3, and the collector is connected to the second base of the OPT 2 via the second resistor 8. To limit the input voltage, there is a zener diode 9.

The device works as follows.

When the input voltage is applied, the capacitor 4 is charged through a resistor 6, the base-emitter junction of the transistor 7 and the resistor 3. At the same time, the voltage across the emitter-collector circuit of the transistor 7 is applied to the second and correspondingly to the first base of OPT 2, As the capacitor 4 is charged, the potential of the emitter of OPT 2 increases, and the potential of its first base decreases, since

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due to a decrease in the base current of the transistor 7, it falls in its collector circuit.

When the potential of the OPT emitter 5 reaches a level higher than that of its first base, the OPT 2 turns on and a discharge pulse of capacitor 4 is formed at load 5. After switching on OPT 2, the base current of transistor 10 of torus 7 increases, and the collector current of the transistor increases accordingly 2 and the voltage applied to the second base of the PFM 2 increases, which contributes to its shutdown. Further, the process is repeated as described above.

Claims (1)

Invention Formula A pulse generator containing a full-wave input voltage rectifier, a threshold switch on a single junction transistor, the emitter of which is connected to the midpoint RC circuit, the first base of a single junction transistor is connected through a load to the output of a capacitor of a serial RC circuit and the first output terminal of a full-wave rectifier, the second output terminal of which is connected to the first output of a first resistor, and the second base of a single junction transistor is connected to the first output of the second a resistor, characterized in that, in order to form a burst of pulses S amplitude modulated by the input voltage, a transistor is inserted in it, the emitter of which is connected to the second output of the first resistor, the base is connected to the output of the resistor of a series RC circuit, and the collector is connected to the second output of the second resistor.