SU1534440A1 - Dc stabilizer - Google Patents

Abstract

The invention relates to electrical engineering and can be used in secondary sources of electrical power for electronic equipment. The goal is to increase the stabilization factor of the output current. The device is a DC stabilizer, made according to a ring circuit on two nodes of the reference voltage and two current supply nodes. The first node of the reference voltage is made on a thermocompensated reference Zener diode 12 and is included in the output circuit of the first current supply node made on the resistor 15 and transistors 5 - 11. The second node of the reference voltage is made on the resistor 13 and transistors 1, 2 and the input is connected to the output circuit The second current supply node, made on the resistor 14 and transistors 3 and 4. The inputs of the first and second current nodes are connected to the outputs of the second and first reference voltage nodes, respectively. The goal is achieved by fixing the voltage on the collector-emitter circuits of transistors 1 and 2 using serially connected basic-emitter circuits of transistors 7, 8 and 10. 4 Il.

Description

tfO 51 ll

-in

ten

15

20

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

The aim of the invention is to increase the stabilization factor of the output current.

The drawing shows a basic electrical circuit of a DC stabilizer.

A DC stabilizer contains the first 1, second 2, third 3, fourth, fifth 5, sixth 6, seventh 7, and eighth 0 transistors, first 9, second 10, and third group 11 n p transistors, reference stabilizer | 13, second 1 f, and third 15 reference resistors, a start node consisting of a coupling diode 1 & and the supply voltage divider of resistors 17 and 18. Moreover, the collector of transistor 1 m emitter of transistor 2 is connected to the output bus through resistor 13. The emitter of transistor 25 of transistor 1 is connected to the emitter of transistor 3 and to the base of transistor 7. The base of transistor 1 is connected to collector the transistor 2. The base of the transistor 3 is connected to the collector of the transistor JQ torus 4. The collector of the transistor 3 and the emitter of the transistor k are connected to the negative power line through a resistor k. The base of the transistor is connected to the bases of transistors B and 6, to the collector of transistor 5 and to the cathode of diode 16. The emitter of transistor 5 and collector of transistor 6 are connected to the combined collectors of transistors of the third 11ns cathode of Zener diode 12, the anode of which is connected to the negative power line. The emitter of transistor 6 is connected to the combined collectors of transistors 7, and 8. The emitter of transistor 7 is connected to the base of transistor 8 and to the combined bases of transistors of the third group 11. The emitter of transistor 8 is connected to the combined emitters of transistors of the second 10 and third 11 groups of transistors. The combined bases and collectors of the first group of 9 transistors are connected to the base of transistor 2 and to the combined bases of the second group of 10 transistors. The combined emitters of the first group of 9 transistors and the combined collectors of the second group of 10 transistors are connected to the output bus through a resistor 15. Anode diode 35

40

50

.

0

5 Q., 04

yes 16 is connected to the average output of the supply voltage divider on the resistors 17 and 18.

The DC stabilizer operates as follows.

When the supply voltage is applied, part of it is removed from the resistor 18, through diode 16 it is applied to the input of the DMHT-terminal Repeater on transistors 3 and ". The output emitter current of transistor 3, the passage through the baso-emitter circuit of transistors 7, 8, 10, 2 and 9, puts all transistors into working mode, the collector currents of which are determined by the parameters of the circuit elements. After turning on the stabilizer, the start-up assembly does not affect the operation of the stabilizer. The output current IMu of the stabilizer is determined by the sum of the currents I. and 1 (G through the resistors 13 and 15,

   + "Ok is defined by the following expression:

n i

5 Q., Where

Lts i

four

(U

+ 1k "-1„ .- b

(ABOUT

and

II

whether

6E 4.5

W1,

five

0

.f) / Rit TOK flowing through resistance

resistor Y; epitage of stabilizer 12;

voltage difference base - emitter of transistors C and 5; Base currents of transistors 2.1 and 7, respectively.

Current I "is determined by the formula I" - (, "",, and / R ". (2)

resistances of resistors 13 and 15; the voltage difference is base – emitter of transistors 2 and 9, respectively.

In view of equations (l) and (2), the value of the current I1 is determined by the following expression:

Where

is R

one

and R

15

whether

Si i.s

kMtt

(. + Ift.lc4.I | lh. (1 +

(3)

Dy.nЈUi. R, r

t

In order to ensure the minimum value of U 5 ,,. 5 and D U b, g transistors 1-6, 9 and 10 it is advisable to manufacture in the integrated design. The density of currents through all transistors should be the same, which is achieved by selecting the resistances of resistors 13–15 and choosing the number of transistor 5 9

15

11 transeistors in groups of tori.

A change in the supply voltage leads to a change in the output current of the stabilizer, which is explained by the dependence of the base currents and the base-emitter voltage of the transistors on the collector-base voltage. The magnitude of the change in the static transfer coefficient p of the transistor in the common emitter circuit when the collector-base voltage varies by 1V is 0.02, and the base-to-emitter voltage change of the transistor is minus. The expression for determining the error of the output current l $ „k when the voltage of the collector varies - the base of the transistors b and 7 is

L1 ad g,;: (+ in “o J2: tH

R- R R Ifk 1f

Fixing the voltage on transistors 1 and 2 using transistors 7 and 8 several times reduces the error in the output current when the supply voltage changes and, consequently, increases the coefficient of stabilization of the output current in comparison with the known DC stabilizer.

Claims (1)

Invention Formula A DC stabilizer containing a reference Zener diode, three reference resistors, eight single transistors, the first and second groups of n transistors, a triggering node consisting of an uni-fading diode and a reactive power supply divider, and the collector of the first transistor and the emitter of the second transistor is connected via the first reference resistor to the output bus, the base of the first transistor is connected to the collector of the second transistor, the emitter of the first transistor is connected to the emitter 1534IO ten The third transistor, the base of which is connected to the collector of the fourth transistor, the collector of the third transistor and the emitter of the fourth transistor, is connected via the second reference resistor to the negative input power line, the base of the fourth transistor is connected to the base and collector of the fifth transistor, and the cathode is developed of the diode, the anode of which is connected to the average output of the resistive divider of the supply voltage, the emitter of the fifth 15 transistors and a collector of the sixth tramistor are connected to the cathode of the Zener diode, the anode of which is connected to the negative power bus, the emitters of the first group of transistors and the collectors of the second group of transistors are connected to the bases of the second group of transistors via the third reference resistor, bases 5 of the first group of transistors connected to the base of the second transistor, characterized in that, in order to increase the stabilization factor of the output current, a third group of π transistors is inserted into it, while the collectors of the third group of transistors are connected to the cathode of the Zener diode, the emitter of the sixth transistor is connected to the collector of the seventh and the eighth transistor, the base of the seventh transistor is connected to the emitter of the first transistor, and the emitter is connected to the base of the eighth transistor, the emitter of which is combined with the emitters of the transistors second the third group of transistors, collectors and bases of the transistors of the first group are interconnected, we take the first, fourth, fifth transistors, as well as the transistors of the second group have one type of conductivity, these are the second, third, sixth, seventh, eighth transistors, and also The tori of the first and third groups have the opposite type of conductivity. 0 0 five