Current-doubler-rectifier ZVS PWM hybrid full-bridge three-level converter

This paper proposes a zero-voltage-switching (ZVS) PWM hybrid full-bridge three-level converter with current-doubler-rectifier (CDR), which achieves ZVS for all the switches under wide load range which the use of the energy stored in the output filter inductance, and meanwhile the rectifier diodes commutate naturally, therefore no voltage oscillation across the rectifier diodes occurs. The output current ripple can be reduced significantly compared with traditional full-bridge converter with CDR over the input voltage range. It is very attractive for wide input voltage range applications. The operation principle of the proposed converter is analyzed In this paper, and the condition of ZVS and reduction of output current ripple are discussed. The experimental results are presented to verify the validity of proposed converter.