Due to the absence of reverse recovery charge and small junction capacitance, wide-band-gap devices are employed for bi-directional on-board charger with the objectives to achieve highest efficiency and power density. A novel two-stage topology is proposed. The 1st stage, employing an interleaved bridgeless PFC in critical conduction mode to realize ZVS, is operated at over 300k Hz. A bi-directional CLLC resonant converter operating at 500Hz is chosen for the 2nd stage. A variable DC-link voltage is adopted to track the wide battery voltage range so that the CLLC resonant converter can always operate at its most efficient point. 1.2k V SiC devices are employed for the high voltage side and GaN devices for the low voltage side. The proposed structure has been demonstrated with 43W/in3 power density and above 96% efficiency over the entire battery voltage range, both far exceed the current practice.
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机译：由于没有反向恢复电荷和较小的结电容，因此宽带隙器件被用于双向车载充电器，目的是实现最高效率和功率密度。提出了一种新颖的两阶段拓扑。第一阶段以临界导通模式采用交错式无桥PFC来实现ZVS，其工作频率超过300k Hz。第二级选择工作在500Hz的双向CLLC谐振转换器。采用可变的直流母线电压来跟踪较宽的电池电压范围，从而使CLLC谐振转换器始终可以在其最高效的点工作。高压侧采用1.2k V SiC器件，低压侧采用GaN器件。在整个电池电压范围内，以43W / in3的功率密度和高于96％的效率对拟议的结构进行了演示，两者均远远超过了目前的做法。
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