Universal Zero-Voltage-Switching Technique for Multi-phase AC/DC Converter

Universal zero-voltage-switching (ZVS) technique for multi-phase AC/DC converter is proposed. With the proposed technique, all switches of the multi-phase AC/DC converter can realize ZVS operation by using one auxiliary circuit. A ZVS-SPWM scheme for the multi-phase converter is introduced. The operation principle and the stage analysis are presented. Generic ZVS condition is derived according to the equivalent resonant circuits. Next, the design guideline of the resonant parameters is presented. Finally, a ZVS four-phase AC/DC converter called ZVS single-phase back-to-back (BTB) converter is investigated as an example and the prototype is set up to validate the proposed universal ZVS technique for the multi-phase converter.

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