SU1283731A1 - D.c.voltage stabilezer - Google Patents

Abstract

The invention relates to electrical engineering, in particular as a source of electrical power for electronic equipment. The purpose of the invention is to increase efficiency and reliability. The goal is achieved by the rational construction of a chain of tasks for a static mode. This minimizes the number of elements in the thermal protection unit 22. At the temperature limit of the stabilizer crystal, the transistor 23 of the thermal protection unit 22 enters an active mode. The current in the collector circuit of the transistor 23 de-energizes the regulating element 1 of the stabilizer. 1 il. I G) (L KHE 00 co with

Description

The invention relates to electrical engineering and can be used to power electronic equipment.

The aim of the invention is to increase efficiency and reliability by reducing the current consumption and simplifying the design of the device.

The drawing shows a constant voltage regulator circuit. I

Voltage stabilizer contains

the regulating element 1, the amplifier 2 of the error signal, functionally combined with the source of the reference voltage, includes the first 3, second 4, third 5, fourth 6, fifth 7, test 8 and seventh 9 transistors and the first 10, second 11 and third 12 resistors, a static mode setting unit 13, including a current follower 14, an eighth 15th ninth 16, a tenth 17th and eleventh 18 transistors and a fourth 19, a fifth 20th and sixth 21 resistors, a thermal protection unit 22 containing the twelfth transistor 23 , with the power input regulator of its element 1 is connected to the common output of the current follower 14 and is the input to the stabilizer 24, its output is connected to the combined collector and base of the transistor 4 and is the output of the stabilizer 25, and the control input is connected to the first output of the current repeater 14, the collector of the transistor 23 and zl the itter of transistor 9 and through a resistor 12 is connected to the collectors of transistors 6 and 8 and to the base of transistor 9. .. The emitter of transistor 4 is connected to the combined base and collector of transistor 5, the emitter of which through the first resistor 10 is connected to a collector of the transistor 3 and the base of the transistor 6, the emitter of which is connected to the base of the transistor 8 and connected via a resistor 11 to the combined collector and base of the transistor 7. The emitter of the transistor 16 is connected via a resistor 21 to the emitters of transistors 7,8,23 and 15, the collector of transistor 9 and a common bus 26, and its base is connected to the collector of trans: resistor 15 and through a resistor 19 is connected to the base of transistor 17, the collector of which is connected to the source of transistor 18. The base of transistor 3 is connected to bases of transistors 15 and 16, and its emitter

connected to the common bus 26 and the drain of the anzistor 18., the gate of which is connected to the input terminal 24 of the stabilizer, and the source through the resistor 20 is connected to the input of the current repeater 14. The emitter of transistor 17 is connected to the collector of transistor 16 and the base of transistor 23, and its base is connected to the second output of current repeater 14.

The constant voltage stabilizer operates as follows.

When the output voltage changes, the error signal through the transistors in the diode switching on 4 and 5 and the resistor 10 goes to the base of the transistor 6 and then amplifies (transistors 6.8 and 9) and acts on the control input of the regulating element 1, while at its output an increment in current appears that compensates for the initial change in output voltage.

The static mode of the stabilizer is set by the mismatch of the emitter areas of the transistors 15 and 16 (S j), while the levels of currents in the chain of reference of the static mode are determined by the following relationship:

wah, ", e

-ten )

R

eleven

Node thermal protection stabilizer 22 operates as follows. At a normal crystal temperature (t 20-50 C), the voltage of the emitter - base of the transistor 23 does not exceed 0.4-0.5 V,

9.2..B, 5

H1B -, 61.

With increasing temperature, the voltage decreases and U, mutually compensates for each other, the voltage rc increases, and the input characteristic of transistor 23 shifts to lower voltages. If the temperature of the Tb stabilizer crystal is close to the limit (for example, t 150 C), then the transistor 23 enters an active mode, a current appears in its collector circuit, which de-energizes the jiery stabilizer element 1.

The stabilizer is triggered on the field-effect transistor 18. At the first moment of time after the input voltage is supplied, the static mode setting circuit is de-energized (transistors 15, t6 and 17 and the current repeater 14), while the gate voltage - the source of transistor 18 is close to zero, and after

Indeed, a current appears in the source and drain circuits of this transistor, which is reflected by the current repeater 14 and transistors 15,16 and 17 translate into active mode. The appearance of the collector current I ,,, leads to

p.1 i

significantly fy the voltage drop across the resistor 20, and the start up circuit is turned off.

Reducing the current consumption and simplifying the circuit in the stabilizer is achieved by rational construction of a static mode setting circuit, which minimizes the number of elements in the thermal protection node.

I

Thus, the proposed stabilizer has 1.5-2 times lower current consumption and contains 3 transistors, 5 resistors and 1 zener diode less than the known stabilizer, while the efficiency of the stabilizer increases by 5-10%.

Claims (1)

Invention Formula A DC voltage regulator, containing a regulating element, an error signal amplifier, functionally combined with a voltage source, consisting of first, second, third, fourth, fifth, sixth and seventh transistors and the first, second and third resistors, the static reference node mode, consisting of a current repeater, the eighth, ninth tenth and eleventh transistors and the fourth, fifth and sixth resistors, the thermal protection unit, consisting of the twelfth transistor, and The regulator's primary input is connected to the common output of the current repeater and the input output, the power output is connected to the combined collector and the base of the second transistor and to the output output, and the control input is connected to the first output of the current repeater, to the twelfth collector and to the emitter the seventh transistor and through the third resistor is connected to the collectors of the fourth and sixth and with the base O of the seventh transistor, the emitter of the second transistor is connected to the union HeHHbnsffl base and the collector of the third transistor, the emitter of which through the first resistor connected to the collector of the first transistor and to the base of the fourth transistor, the emitter of which is connected to the base of the sixth transistor and through the second resistor connected to the combined collector and 0 base of the fifth transistor, through the sixth resistor is connected emitters of the fifth, sixth, eighth and twelfth transistors, with the collector of the seventh 5 transistor and with a common bus, and the base with the collector of the eighth transistor and through the fourth resistor is connected to the base of the tenth transistor The collector of which is connected to the source of the eleventh transistor, characterized in that, in order to increase efficiency and reliability by reducing the current consumption and simplify the circuit, the base of the first transistor is connected 5 to the bases of the eighth and ninth transistors, and the emitter is connected to a common bus and drain of the eleventh transistor, the gate of which is connected to the input terminal, and the source through the n - th resistor is connected to the input of the current follower, the emitter of the tenth transistor is connected to the collector of the ninth and to the base of the twelfth transistor in, and base connected to the second swing You are a 5-follower current.