An efficient full bridge PWM DC-DC converter topology using lossless snubber and simple active energy recovery network

The single-phase full-bridge mode pulse-width modulated (PWM) DC-DC converter topology discussed minimizes switching losses and resulting stresses through the effective use of one DC bus inductor and two snubber capacitors. The inductor provides zero current turn-on and the capacitors are alternately connected across each switch, thus providing zero voltage turn-off. After turn-off, capacitor energy is transferred to the load through a low loss path. A simple active energy recovery network that increases the overall converter efficiency is also proposed. The authors include a complete circuit analysis and design procedure. Predicted results are verified experimentally on a 5 kW, 10 kHz laboratory prototype