A family of turn-on and turn-off nondissipative passive snubbers for soft-switching single-phase rectifier with reduced conduction losses

This paper presents a family of nondissipative passive snubbers applied to the single-phase rectifier with reduced conduction losses, for applications in power supply for telecommunication and UPS. The family of lossless passive snubbers presented in this paper guarantees soft-commutation during the turn-on and the turn-off intervals of the switch. The snubber not only should slow the di/dt and dv/dt rates of the active switch, but also losslessly recover the energy stored in the zero-current inductor and in the zero-voltage capacitor, leading to reduced voltage stress across the switch and diodes. A methodology to generate the family of passive snubbers for the single-phase rectifier with reduced conduction losses is also presented. Simulation and experimental results for a single-phase rectifier 3000 W laboratory prototype using one snubber of the family are also presented.