ZVZCS Full Bridge Dc-Dc Converter with Reduced Circulating Loss and Filter Requirement

A new ZVZCS full bridge converter with phase-shift control is proposed to reduce the circulating loss in primary side and the voltage stress in secondary side. Using a coupled winding of the filter inductor, two auxiliary voltage sources are generated to reset the primary current at circulating interval. An auxiliary clamp diode is utilized to clamp the voltage spike across the rectifier diode, which releases the voltage stress for rectifier diode. Therefore low break down voltage diodes could be used to reduce the conducting loss and the reverse recovery loss. Also the filter requirements are lowered due to the auxiliary voltage sources. A prototype is built up to verify the theoretical analysis.

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