ABSTRACT

This project presents a reconfigurable totem-pole bridgeless power factor correction (PFC) converter employing an auxiliary circuit and simple control scheme to achieve high efficiency. Under light load condition, instead of delivering the energy through the main switch, the proposed converter utilizes the auxiliary switches only by using different control scheme. Since the auxiliary switches have much smaller parasitic capacitances than the main switches, the proposed converter can obtain high efficiency under light load condition. Over middle to-heavy load condition, the proposed converter can acquire both ZVS operation and relieved reverse recovery problem thanks to the auxiliary circuit, which leads to high efficiency even with SiMOSFET in the continuous conduction mode (CCM) control. The proposed converter can achieve high efficiency over the entire load conditions.