Implementation and performance evaluation of 100-kHz, soft-switched bidirectional PFC/inverter with silicon MOSFETs

In this paper, the performance of a bidirectional ac/dc converter which utilizes silicon MOSFETs and operates in continuous-conduction mode (CCM) with 100-kHz switching frequency is evaluated. The converter is implemented with an active snubber that virtually eliminates losses related to the reverse-recovery charge of the body diodes of Si MOSFET switches and also provides for their zero-voltage switching (ZVS). The circuit operation was verified with a 3.3 kW PFC/inverter experimental prototype designed for 230-Vrms nominal ac voltage and 400-V dc voltage. The measured circuit efficiency in both directions is greater than 97.9% at loads greater than 45%.