SU1398053A1 - D.c. voltage converter - Google Patents

Abstract

The invention relates to electrical engineering, can be used in secondary power sources. The goal is to reduce dynamic losses. The device is designed as an inverter cell with a transformer 5. The input circuits of transistors 1, 2 are shunted by reverse diodes 7, 8 and the base resistor 9. If a negative voltage appears on the base winding 6 with respect to the base of transistor 2 and positive with respect to the base of transistor 1, transistor 2 and reverse diode 7 are open. The current flowing through the circuit of the base-emulator transition of the transistor 2 - the base resistor 9 - reverse diode 7, creates a voltage drop across the base resistor 9, blocking the reverse diode 8 and the base-voltage transition of the transistor 1. When the polarity of the base winding 6 changes, a similar process occurs closing transistor 2 and opening transistor 1. 1 il. e (L

Description

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ABOUT

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The invention relates to electrically exHHKe and can be used in secondary power sources.

The aim of the invention is to reduce dynamic losses.

The drawing shows a circuit diagram of a constant voltage converter.

The converter contains two type 1 and 2 transistors, the collectors of which, through the primary half windings 3 and 4 of transformer 5, are connected to the negative supply terminal, emitters | s to the positive supply terminal, and the bases are interconnected via a pair : an allelicly connected base winding (, transformer 5 and a chain of two series-connected reverse 7 and 8 and 1 diode of transistors 1 and 2 connected to the biy, common point, diodes 7 and 8 through a resistor 9 is connected to the positive power output

The device works as follows.

When a voltage across the winding 6 appears negative with respect to the base of transistor 2. and positive with respect to the base of transistor 1, transistor 2 and diode 7 open, the current flowing through ithft through the base-emitter junction of transistor 2, resistor 9 - diode 7, creates a drop the voltage across the resistor 9,

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the locking diode 8 and the base-emitter junction of transistor 1. When the voltage of the winding 6 is changed polarity, the same process of closing the transistor 2, diode 7 and opening the transistor 1 and diode 8 occurs. The locking voltage is approximately equal to the voltage of the base winding 6, which reduces the dynamic losses in transistors.

Claims (1)

Invention Formula A constant-voltage converter containing a self-oscillating inverter cell. On transistors with a transformer output, one base winding and one base resistor, the first input terminal is connected to the common point of the primary half-windings of the transformer, and the second input terminal to the combined first power transistor electrodes, the second power electrodes of which are connected to the free leads of the primary semi-windings of the transformer, and the first leads of the reverse diodes are connected to the transistor bases, lichayuschiys in that, in order to reduce dynamic losses, the second terminals wheeling diodes are connected to a second input terminal through the base resistor.