High-Efficiency High-Power Bridgeless Integrated AC-DC Converter for On-Board Vehicle Battery Charger

In order to design a high-efficiency, cost-effective, high-power on-board vehicle battery charger for supplying electric vehicles, a novel bridgeless, soft switched integrated AC-DC converter is proposed. The proposed converter can realize the ZVS operation of the power factor correction (PFC) circuit's power switches by sharing MOSFET switches of PFC circuit and full-bridge LLC resonant converter. Different from previous quasi-single-stage integrated AC-DC converter [7] [12], the topology's stable output voltage and the bus voltage can be simultaneously independently achieved. Moreover, the proposed converter possesses with intrinsic voltage-doubler PFC characteristic, which is suitable for high output voltage applications. The detailed operation principles for the proposed converter are analyzed and discussed. The feature of the proposed topology was demonstrated using PSIM simulation and a hardware prototype. The experimental results showed the converter achieves full-range ZVS for primary switches and the efficiency of 94.5% under the 110 V input voltage.