SU1193781A1 - Pulser - Google Patents

Abstract

The PULSE VOLTAGE GENERATOR contains a first transistor whose collector is connected to the base of the second transistor, a capacitor whose first terminal is connected via a first resistor to the power supply bus, a second resistor and a voltage source, in order to increase the manufacturability, increase the utilization factor of the timing capacitor, increasing the duty cycle and reducing the duration of the output pulse, the third transistor, the reference element, the element charge, the first input of the comparison element is connected to the first terminal of the capacitor, the second input to the voltage source, and the output through the second resistor is connected to the base of the second transistor, the base of the first transistor is connected to the collector of the third transistor, the base of which is connected to the zero potential bus, in e viter - with the second output of the capacitor and the first output of the charge element, the second output of which is connected to the bus with zero potential, with which the emitter of the second transistor, the collector of the second trap is also connected The resistor is connected to the first capacitor terminal, the emitter of the first transistor is connected to the power supply bus. 3 about with J 00

Description

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The invention relates to a pulse technique and can be used in devices where it is required to form almost rectangular pulses of short duration and long duty cycle.

The aim of the invention is to increase the utilization rate of the timed capacitor., The improvement of processability, the increase in the duty cycle and the yMeHbtjetrtrfe duration of the pulse. .

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The practical electrical circuit of the pulse pulse generator is provided. The generator contains a capacitor 1, transistors 2-4, a source 5 of Litany voltage, an adjustable source 6 of voltage, for example, obtained from a source 5 on a divider of resistors, comparison element 7, having inputs 8 and 9, output 10, resistors 11 and 12 charge element 13, for example, made on a diode or a resistor, with a resistor 11, a capacitor 1 and a charge element 13 connected between the power supply buses, a terminal of the resistor 11 connected to the collector of transistor 3 which emitter transistor 3 is connected to the collector of transistor 2 and resistor 12, the emitter of transistor 2 is connected to the power supply bus, the base is connected to the collector of transistor A, the emitter of which is connected to one of the outputs of charge element 13, the base of transistor 4 is connected the common bus, the inputs of the comparison element 7 are connected to the voltage source and the capacitor 1, and the output to the output of the resistor 12.

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Comparison element 7 may, for example, be implemented on transistors 14 and 15.

Consideration of the operation of generator 5 will begin from the moment the capacitor 1 starts charging from source 5 through resistor 11 and charge element 13.

In this case, the transistors 2-4 are locked, and there is no voltage at the output of the comparison element 7.

When the voltage on the capacitor 1 exceeds the voltage set by the adjustable source 6, the output of the comparison element 7 is the voltage that is applied through the resistor 12 to the base of the transistor 3, opening it. As a result, capacitor 1 begins to discharge through the emitter of transistor 4. The collector current of transistor 4 appears, the base current of transistor 2 and the base current of transistor 3, and the discharge of capacitor 1 occurs later regardless of the presence of voltage from output 10 of reference element 7.

The duration of the output pulse is equal to the time of the presence at the input 8 of a voltage exceeding the voltage of source 6. Practically 30, this time is equal to the frequency properties of the transistors and the depth of the positive feedback connection, which is determined by the value of the resistor 12 for a given capacitance capacitance 1.

After the capacitor 1 is discharged, the transistors 2-4 are locked, the capacitor 1 starts to re-charge, and all processes are repeated.

The increase in the duty cycle and coefficient of use of the timing container is due to the fact that the time it takes to pulses is equal to the sum of the charge and discharge times of the clock capacity.

Claims (1)

. PULSE GENERATOR, comprising a first transistor, the collector of which is connected to the base of the second transistor, a capacitor, the first output of which is connected through the first resistor to the bus of the power source, the second resistor is the reference voltage source, which is characterized by the fact that, in order to increase the manufacturability, increasing the utilization rate of the timing capacitor, increasing the duty cycle and reducing the duration of the output pulse, a third transistor, a comparison element, a charge element are additionally introduced into it , the first input of the comparison element is connected to the first output of the capacitor, the second input is connected to the reference voltage source, and the output through the second resistor is connected to the base of the second * transistor, the base of the first transistor is connected to the collector of the third transistor, the base of which is connected to the zero potential bus, and the emitter - with the second terminal of the capacitor and the first terminal of the charge element, the second terminal of which is connected to a zero potential potential, to which * the emitter of the second transistor, the collector of the second transistor is also connected Inonii to a first terminal of the capacitor, the emitter of the first transistor is connected to the bus power source.