A loss-less passive snubber for soft-switching boost-type converters

A novel loss-less passive snubber is proposed for the soft-switching boost-type converters. The proposed snubber does not use any auxiliary switches, but uses two snubber capacitors which are charged in parallel and discharged in series automatically. The discharged energy is recovered effectively (more than 95% recovery) into the output capacitor. Thus the snubber provides zero-voltage switching for the converter main switch reducing the turn-off losses and improves the converter efficiency. The experimental results of a 20 kHz DC-DC boost converter and a single-phase AC-DC boost rectifier with the new snubber are presented.