SU483781A1 - Pulse Width Converter - Google Patents

Description

(54) PULSE-PULSE CONVERTER

one

The invention relates to radio engineering.

Known pulse-width Converter containing multivibrator transistors, transistor switch, included during the master circuit of the multivibrator.

The proposed converter is characterized in that a transistor current stabilizer is introduced in it, the base of the transistor of which is connected via a collector resistor to one of the multivibrator transistors connected through a series-connected resistor and diode to the current stabilizer transistor collector, and a zener diode connected between the resistor connection point and the common bus .

The drawing shows the proposed device.

The converter contains a multivibrator on transistors 1 and 2, a transistor 3. (transistor switch), a transistor current stabilizer on transistor 4, a diode 5, a zener diode 6, a time specifying capacitance 7 and resistors 8-13.

The device works as follows.

In the initial state, the output transistor 2 is open with a negative potential from the source of the converted voltage applied through the transistors 3 and 4. The open state of the transistor 3 is provided by

to its base of positive potential from the collector of transistor 2, and the open state of transistor 4 to a positive potential supplied to its base through a resistor.

The time setting capacitor 7 is charged at the same time approximately to the level of the voltage being converted through the emitter-collector of transistor 3, the base-emitter of transistor 4 and the base-emitter of transistor 2.

When a triggering pulse UQ is applied to the base of transistor 1, it opens. The base of the transistor 2 turns out to be under a positive potential equal to the voltage for the time of the driving capacitor 7. The transistor 2 is locked, the negative potential appearing on its collector locks the key transistor 3 and keeps the transistor 1 in the open state. The discharge time of the master starts.

the capacitor through the collector - emitter of transistor 3, diode 5, resistors 10, And, 13, the power source and the collector - emitter of transistor 1. The discharge current is determined by the level of the supply voltage and resistance in the emitter of the transistor 3.

Due to one hundred percent negative current feedback on the resistance in the emitter circuit, the discharge current is constant and the voltage at the base of transistor 2 varies linearly.

As the base potential of the transistor 2 decreases, it trips to the pickup level, and the circuit returns to its original state.

The duration of the output pulse at the collector 2 is proportional to the magnitude of the input signal.

The proposed device can perform multiplication. For this, a transistor switch is connected to the voltage source in proportion to the smaller of the factors, and a current regulator through a resistor is connected to the voltage source in proportion to the second factor.

Uo Subject Invention

A pulse width converter containing a multivibrator on transistors, a transistor switch included during the master circuit of a multivibrator, characterized in that, in order to increase the linearity of the conversion, a transistor current stabilizer is inserted into it, the base of the transistor of which is connected via a resistor to the collector of one of the multivibrator transistors connected via a series-connected resistor and diode to the collector of the current-stabilizer transistor, and a zener diode connected between the connection point sources and the general area.