SU1309219A1 - D.c.voltage converter - Google Patents

Abstract

Inventiveness relates to the field of electrical engineering and can be used in the design of: - secondary power sources. Cs, 1b () vylenis Efficiency. A power-over device along a half-bridge circuit, one of the transistors of the transistor rack is controlled from the b: 1 control switch. The bias circuit of the KO.I-lecturer-base junction of the other transistor contains a resistor 10 and an additional bias source, made on the capacitor 9. The capacitor 9 through the diode 6 sub. It comes to the ball: a single resistor 5, part of a parametric stabilizer containing zener diodes 6 and 7, 1 connected in parallel with capacitors of capacitors (phone. The introduction of an auxiliary bias source allows you to optimize the selection of the bias resistor 10 in half bridges and inverter circuits. I or with O C5 N "XI (L OS o its rs3 SS

Description

The invention is intended to convert AC input energy to DC output energy and can be used in converter equipment.

The purpose of the invention is to increase the efficiency by optimizing the base current of the second transistor.

The drawing shows a diagram of the Converter.

The converter contains a control unit connected to the base of the first transistor 1, whose collector is connected to the base of the second transistor 2 and to the cathode of diode 3, the emitter of the second transistor 2 and the anode of diode 3 are connected to the winding of the output transformer 4. The ballast resistor 5, zener diodes b and 7 input t in the composition of the parametric stabilizer. A capacitor 9 is connected to the ballast resistor 5 through diode 8, which forms an additional source for transistor 2 connected to the bias circuit with resistor 10.

The Converter operates as follows.

The control unit generates rectangular pulses of a given frequency, periodically opening and closing transistor 1. At the time when transistor 1 is closed, transistor 2 opens with current flowing through resistor 10. At the moment of opening transistor 1, reverse voltage is applied to the base-emitter junction of transistor 2 , causing effective resorption of nonbasic carriers in the base of transistor 2, while the current flows to the load through the base-emitter junction of transistor 2 to the point 0

0

five

five

0

This opening of diode 3. Such inclusion allows to exclude the appearance of through current. Diode 3 limits the reverse voltage at the base-emitter junction of transistor 2. The closing of transistor 1 also occurs without the appearance of a through-current. The additional bias source sets a certain base current of the transistor 2, which enters the saturation, which makes it possible to optimize the selection of the bias resistor in its base-collector junction.

Claims (1)

Invention Formula A half-voltage converter made by half-bridge, one of the transistors included in the transistor rack, which is connected to the control unit, the collector of this transistor is connected via a diode to the emitter of the second transistor, forming one of the output pins, and directly to the base of the second a transistor connected through an bias circuit containing a resistor with a collector of the second transistor connected to one of the input power terminals, characterized in that, in order to increase efficiency by optimizing In addition, a second bias source is introduced into the bias circuit of the second transistor, made in the form of a capacitor connected through an input diode to the ballast resistor, input. I entered the parametric stabilizer made in the form of zener diodes connected parallel to capacitors of a capacitive type. . Shtela Iair Woman and.