A phase shift full bridge based reconfigurable PEV onboard charger with extended ZVS range and zero duty cycle loss

In this paper, an integrated onboard charger architecture is proposed for plug-in electric vehicle (PEV). In this architecture, the phase shift full bridge (PSFB) converter serves as the main high voltage battery charging topology, and the half bridge LLC resonant converter serves as the low voltage battery charging topology. Under light charging mode, the half-bridge LLC is reconfigured to be paralleled with the PSFB topology, to guarantee zero voltage switching (ZVS) of the lagging-leg MOSFETs. Practical design considerations are presented for both the PSFB and the half bridge LLC converters. Switching frequency and the shifted phase angle provide two degrees of freedom to regulate the output voltage/current of both converters. The proposed architecture maintains low cost and high efficiency in this specific application. A 390V input, 420V/2.4A, 14V/21A outputs converter prototype is designed, simulated, and analyzed to verify the proof of concept.