Analysis and implementation of a soft switching converter with high-voltage conversion ratio

The zero voltage switching (ZVS) boost converter with high-voltage gain is presented to overcome the limit of conventional boost converter with narrow turn-off period. Compared with the conventional boost converter, the adopted converter has wide turn-off period so that the higher output voltage can be achieved. The boost type of active clamp is used to limit the voltage stress of power switch. The resonance based on the output capacitance of power switch and resonant inductance will make the power switches to turn on at ZVS. The circuit configuration, principle operation, system analysis and design consideration of the adopted converter are presented. Finally, experiments conducted on a laboratory prototype rated at 240 W are presented to verify the effectiveness of the adopted converter.