A novel series input parallel output soft-switching high step-down converter: Analysis and implementation

A novel series input parallel output soft-switching high step-down converter (SIPOSS-HSD) converter is proposed in this paper. The converter consists of two asymmetrical half-bridge high step-down (AHB-HSD) dc-dc converter cells in series input and parallel output connection to share the input voltage and output current. All switches of the proposed SIPOSS-HSD converter can be turned on under zero-voltage switching (ZVS) condition. It reveals that the proposed converter suitable for high input voltage, high output current and high efficiency applications. Moreover, the operating principle of the proposed converter is presented to ensure the all the features of the proposed can be achieved. Finally, a switching frequency 100 kHz and output power 150~750 W prototype of proposed converter is implemented. The theoretical analysis is thus verified by experimental results. It shows that the proposed SIPOSS-HSDC has the highest efficiency of 90.7 %.