Performance Analysis of Combined (ZVS, ZCS) DC-DC Converter

This paper presents a Hybrid Switching step-down DC/DC converter with isolation between line and source using a transformer. This converter provides a wide range of Z.V.S and Z.C.S which is zero voltage switching for the leading switches in inverter circuit and zero current switching for lagging switches in the inverter circuit. A combination of ZVS and ZCS is used to avoid freewheeling circulating losses in primary side. Since the Voltage across the Resonating Capacitor is applied between bridge rectifier and output inductor for freewheeling interval, due to which a small size output inductor can be used. By providing a clamping path to the current rectifier of combined Switching circuit, eliminating the voltage overshoots that arise during turn-OFF of Rectifier diodes. The effectiveness of H.S.P.S.F.B DC-DC converter is verified using MATLAB simulation tool.