Design considerations and performance evaluation of a 3 kW, soft-switched boost converter with active snubber

The paper provides a complete design procedure of a high-power-factor (HPF) boost converter which employs an active snubber to reduce reverse-recovery related losses of the boost rectifier and achieve zero-voltage switching (ZVS) of the boost switch. The losses are reduced by inserting an inductor in the series path of the boost rectifier to reduce the di/dt rate during its turn-off. Extensive experimental evaluations of the performance of a 3 kW prototype for telecommunication applications operating from a 220 V/sub rms//spl plusmn/20% input are presented. The evaluation results demonstrate that the HPF boost converter can operate at 100 kHz switching frequency with an efficiency in the 94-97% range at full power.