Design and Analysis of auxiliary circuits ZCS based full- bridge Converter to single phase induction drive applications

Abstract

A new soft switching pulse-width-modulated (PWM) fly back dc/dc converter with a simple auxiliarycircuit is proposed. This isachieved by using two very simple active auxiliary circuitsoneactive, the other passive. The outstanding featureof the new converter is that it allows its main power switchesto operate with zero current switching (ZCS) and with fewer conductionlosses than conventional full-bridge converters.By adding this auxiliary circuit to the conventional pulse width modulation isolated fly back converter,Is isolated with the inducation motor applications.proposed techniques for higher power dc–dc full-bridge converterswith IGBTs, including resonant techniques, ZCS-PWMtechniques with active auxiliary circuits, passive techniques,ZVZCS techniques, and techniques that require the use of reverseblocking diodes. Experimental results obtained from all power semiconductor devices are soft switched. In addition, the proposed converter frequency is constant and has no additional current stress in the main switch in comparison with conventional ones. In the Simulation and experimental results justify the theoretical analysis.