SU1686654A1 - Constant voltage-to-constant voltage one-stage converter - Google Patents

Abstract

The invention relates to converter equipment and can be used as a source of secondary power. The purpose of the invention is to increase efficiency. When the control unit 6 is triggered, a triggering pulse is applied to the control input of the power transistor 1. The capacitor 8 is discharged through the control circuit 6, the base-emitter circuit of the power transistor 1 and the diode 9, locking the transistor 7 and providing a pulsed control current of the transistor 1. Thereby it decreases the required output current of the control unit 6 and the current consumed from the power source. 1 silt

Description

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The invention relates to converter equipment and can be used as a source of secondary power supply.

The purpose of the invention is to increase efficiency.

The drawing shows a circuit diagram of a single-ended converter.

The converter contains a power transistor 1, a transformer 2, a rectifier 3, a filter 4, a power circuit connected to the first input of control unit 8, to the second input of which the output of the master oscillator, an additional transistor 7, a capacitor 8, a diode 9 and a resistor are connected ten.

The converter works as follows

In the absence of the output of the control unit 6, the pulse of the unlocking of the transistor 1 from the power source + Еп through the resistor 10, the capacitor 8 and the base-emitter circuit of the additional transistor 7 flows a current unlocking it. The collector-emitter circuit of transistor 7 short-circuits the control circuit of the power transistor 1, providing a short circuit of the uncontrolled collector current of transistor 1 to ground, and the collector current value (transistor amplification factor) is greater than the base current of transistor 7. At this time, transistor 7 replaces the base resistor, the installation of which is normalized by the conditions of application of the power transistor. When the control unit operates and gives the control input of the transistor 1 a triggering pulse, the capacitor 8 discharges

through the control unit, the base-emitter circuit of the transistor 1 and the diode 9, locking the transistor 7 and providing a pulsed control current for the transistor 1. Due to this, the required output control current 6 and the current consumed from the power supply are reduced, the power loss and, accordingly, the decrease The efficiency of the transducer from this factor is essential.

Claims (1)

Claims Single-phase DC / DC converter containing a power transistor, the power circuit of which is connected to the input terminals via the primary winding of the transformer, the secondary winding of which is connected through the rectifier and filter to the output terminals and inputs of the comparison circuit, the output of which is connected to the first the input of the control unit, the second input of which is connected to the output of the master oscillator, and the output - to the control input of the power transistor, with the first power output of the control unit It is connected via a resistor to the first input terminal, characterized in that, in order to increase efficiency, the control input of the power transistor is bridged by the power circuit of the inserted additional transistor, the control base-effect junction of which is bridged by a reverse diode, and the base is connected to the second power output of the control unit and one of the terminals of the inserted capacitor, the other terminal of which is connected to the first supply terminal of the control unit.