A semi-bridgeless boost power factor corrected converter with an auxiliary zero voltage switching circuit for electric vehicle battery chargers

This paper presents a new zero-voltage switching (ZVS) semi-bridgeless ac-dc boost converter for application in plug-in hybrid electric vehicle battery chargers. The proposed auxiliary circuit enables ZVS for the main and auxiliary switches, which nearly eliminates all switching losses, enabling improved efficiency. The auxiliary circuit also helps to reduce the reverse-recovery losses of the boost diodes. The detailed operation of the proposed converter, a stress analysis of the auxiliary circuit components, and a proper design procedure are presented. The feasibility of the converter is confirmed by a simulation work operating at 70 kHz switching frequency, 240 V input, and 400 V/3.4 kW output.