ABSTRACT A new soft switching active snubber cell with constant configuration is proposed. The proposed active snubber uses an auxiliary switch to recover stored energy in the snubber capacitor during turn off of the main switch. Complete analysis for the boost converter is given and the results obtained for other DC/DC converters are reported. Soft switching commutation is achieved for all semiconductor devices and consequently the switching losses and electromagnetic interference (EMI) are considerably reduced. Both simulation and experimental results are presented.