SU1746490A1 - Stabilized dc voltage converter - Google Patents

Abstract

Usage: secondary sources of power electronic equipment. The essence of the invention: the device contains a power part 1, a key transistor 2, resistors 3 and 4, a diode 5, an inductor 6 and a control unit 7 containing a transistor 10, an additional transistor It, a transformer 12, a diode 13, a resistor 14, pulse width modulator 15, voltage divider 16 and threshold element 17. Efficiency increased by eliminating a current-limiting resistor in the energy storage circuits in choke 6 and transferring energy to turn on the key transistor 2. By shunting the control transition of the key transistor 2 resistor 4 is excluded overvoltages at the indicated junction. 3 il.

Description

/

U6ttl

n

tfxtwsxc

yy

&

is

Vtota

to

l / №flp

i

i

V8Јffff # b

Ll

fnlks

 11mnsh

H%

Crmsh

/

3

PMSH

FIG. 2

Claims (1)

Claim A stabilized DC-voltage converter containing a power part, a key transistor, first and second resistors, a diode, a choke and a control unit equipped with first and second power inputs, including a transistor and a transformer, the end of the primary winding of which is connected to the transistor collector, and the secondary windings 5 pins connected to the first and second outputs of the control unit, the emitter of the transistor is connected to the second power input of the control unit, and the first output of the first resistor is connected to the output of the control unit, and the first output of the second resistor with the second output of the control unit, the emitter of the key transistor and one of the inputs of the power part, the other input of which is connected to the collector 15 of the key transistor, the cathode of the diode is connected to one of the terminals of the inductor, characterized in that, in order to increase efficiency and reliability, an additional transistor, resistor, di20 od, a pulse-width modulator with a sawtooth generator with a steep cut, a threshold element, a voltage divider, chrome are introduced into the control unit Moreover, the control unit is equipped with third and fourth 25 outputs, and the primary winding of the transformer of the control unit is equipped with a tap, to which the first supply input of the control unit, the emitter of the additional transistor and one of the 30 inputs of the voltage divider are connected, the beginning of the primary winding of the transformer is connected to the diode cathode, the anode which through a resistor is connected to the output of the threshold element and the base of an additional 35 transistor, the collector of which is connected to the third output of the control unit, the collector of the transistor is connected to the fourth output of the control unit, the other input of the voltage divider is connected to the second supply input of the control unit, the first output of the pulse-width modulator is connected to the base of the transistor, the second output is connected to the first input of the threshold element. and the input is with the control input of the control unit 45, the second input of the threshold element is connected to the output of the voltage divider, the anode of the diode connected to the third output of the control unit, and the other output of the inductor to the fourth output 50 of the control unit, the second terminals of the resistors connected to the base of the key transistor , the output of the power unit is connected to the control input of the control unit.