QUASI-RESONANCE CONSTANT VOLTAGE CONVERTER WITH SWITCHING- OVER UNDER ZERO VOLTAGE Russian patent published in 1998 - IPC

FIELD: conversion equipment , telecommunication equipment, power supply systems for conversion of constant voltage. SUBSTANCE: for simplification of control circuit of converter and reduction of overvoltage across power key to keep high efficiency quasi-resonance constant voltage converter with switching-over under zero voltage has power transformer, power transistor key, controlling transistor key shunted by opposing diode and connected through resistor to input of power transistor key which controlling input is linked to output of controlling transistor key and through circuit composed of resistors, capacitor and second winding of power transformer connected in series to another input of power supply source. Its first input is connected to output of power transistor key through first winding of power transistor which secondary winding is connected through diode and capacitor connected in parallel to output leads. Converter is inserted with two capacitors connected in parallel to input and output of power transistor key. EFFECT: simplified control circuit of converter and reduced overvoltage across power key. 2 dwg