Zero-voltage-switching DC/DC converter with three three-level pulse-width modulation circuit cells

This study presents a new soft switching DC/DC converter with current double rectifier to achieve zero-voltage switching for all power switches under a wide range of load condition. Three three-level pulse-width modulation circuit cells sharing the same power switches are adopted in the proposed converter to reduce the voltage stress of each switch at V_in/2 and achieve load current sharing. Therefore the current stress and power rating of the secondary side components are reduced. The current double rectifiers are used at the secondary side to reduce the output ripple current. The sizes of the magnetic components and output filter capacitance can be reduced. The circuit analysis and design consideration of the proposed converter are discussed in detail. The proposed converter can be used in high input voltage and high load current applications. Finally, experiments based on a 1.5 kW scale-down prototype are provided to verify the effectiveness of the proposed converter.