SU1176317A1 - D.c.voltage stabilizer - Google Patents

Abstract

A CONSTANT VOLTAGE STABILIZER containing a regulating transistor connected by an emitter the transistor, the feedback unit connected to the common bus by the first input to the output terminal, and the output to the base of the matching transistor, the pulse unit start, connected to the common terminal with the power input to the input terminal, and the output to the second input of the feedback unit, tyr-. A torus connected between the input terminal and the collector of the matching transistor, and the control electrode connected to the average output variable resistors are resistors, separately connected to the emitter junction of the control and matching transistors, characterized in that, in order to improve weight and size, increase reliability and economy. In addition, an additional variable resistor and a field-effect transistor, the source of which is connected, are introduced into it: with the base of the regulating transistor, the drain is connected to the collector according to popping transistor, and the gate - middle terminal of said variable resistor, which is incorporated myzhdu count speaker, and emitter regulating O) transistor. with

Description

one

The invention relates to electrical engineering and can be used in secondary sources of power for electronic equipment.

The purpose of the invention is to improve weight and size indicators, increasing reliability and cost-effectiveness.

The drawing shows a functional DC voltage regulator circuit.

The device contains a regulating transistor 1, a matching transistor 2, a feedback unit 3, a pulse start unit 4, a protective thyristor 5, a variable resistor 6, a capacitor 7, a field-effect transistor 8 and an additional variable resistor 9.

The stabilizer works as follows.

The impulse of the starting block 4, acting on the block 3, causes the opening of the transistors 1 and 2 and the appearance of the output voltage. In the normal operation of the stabilizer, the output voltage is maintained at a predetermined level by the feedback unit 3, and through the transistor 2, the resistor 6 and transistor 8 flows a current almost equal to the base current of transistor 1 and proportional to the load current of the stabilizer. The resistance of the channel of the transistor 8 is determined by the magnitude of the voltage applied to the gap the source of the drain taken from the resistor 9 and then atelno, size of the voltage drop on the steered switching transistor 1. Therefore, the voltage across the resistor 6, and consequently also the control voltage applied to the control transfer thyristor 5 will also be proportional to the load current and the stabilizer voltage drop across the control tranzis172

torus 1 (proportional to the power dissipated on the control transistor). Using a variable resistor 6, the threshold of operation of the thyristor 5 is set. With the help of resistor 9, the degree of correction of the operation of voltage protection is set. At the maximum output voltage, the voltage drop across transistor 1 is small, transistor 8 is open, its channel resistance is minimal, therefore, the protection will be triggered when the collector current of transistor 2 is high or the stabilizer load is higher. At the minimum output voltage, a significant voltage drop is connected to the control transition of the transistor 8, the resistance of its channel increases. The total resistance of the parallel circuit from the resistor 6 and the channel of the transistor 8 increases, and the operation of the circuit will occur at a lower load current. With the appropriate installation of the resistor 8, it is possible to obtain a protection threshold corresponding to a certain power dissipated in the regulating transistor circuit.

Thanks to the funds introduced

it became possible to more fully utilize the energy capabilities of the stabilizer, especially with flexible adjustment of the output voltage. There is no need to manually adjust the threshold of protection depending on the magnitude of the output voltage, which is difficult when using the device as part of

automated systems. Due to a more complete use of the energy capabilities of the stabilizer, the weight and dimensions of the heat sinks can be reduced, the reliability of the device increases.

SCR

-ho

X /

u-f

M

five

num

Z / & / X

-ABOUT

-about

Claims (1)

A DC voltage stabilizer containing a control transistor connected by an emitter to an input terminal, and a collector to an output terminal, a matching transistor of different conductivity with a control transistor, the emitter of which is connected to a common bus, and the collector through a parallel-connected alternating resistor and capacitor to the base of the regulating transistor, a feedback block connected to the common bus by the first input to the output terminal, and the output to the base of the matching transistor, the pulse block ska connected on a common bus supply input to the input terminal and the output - to the second input of the feedback unit tiris-. a torus connected between the input terminal and the collector of the matching transistor, and resistors connected to the middle terminal of the variable resistor by a control electrode _? individually connected to the emitter junctions of the regulating and matching transistors, characterized in that, in order to improve weight and size indicators, increase reliability and save SS, an additional variable resistor and field effect transistor are introduced into it, the source of which is connected to the base of the regulating transistor, the drain is with the collector of the matching transistor, and the gate with the middle output of the specified variable resistor, which is connected between the collector and the emitter of the regulating transistor. ^{1 11}