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    Vehicular Power Electronic Circuits and Systems

    T08.2 - An Reconfigurable Series Parallel Resonant Converter for 400V and 800V Architectures in EV Fast Charging

    Tuesday, March 24, 2026
    8:50 AM - 9:10 AM CT
    Location: 217D
    This paper presents a novel input-parallel, output-series DC-DC converter for electric vehicle (EV) charging systems transitioning from 400V to 800V architectures. The converter, featuring a simple on-off relay switch, enables two operating modes and extends the output voltage range to cover both 400V and 800V charging systems while maintaining modular operation benefits. It ensures automatic voltage balancing on the series-connected output side and current sharing through coupled inductors, even with resonant parameter inconsistencies on the parallel input side. Pulse frequency modulation (PFM) is used for control, ensuring soft-switching across the full voltage range. Experimental results from a 1kW prototype with a 400V input and 200-800V output demonstrate a peak efficiency of 93.7%, with overall efficiency exceeding 92% across the entire voltage range. This converter design offers an efficient, simple solution for high-power EV charging stations.