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    Magnetics Modeling and Simulations

    T36.4 - Coupled Inductor Design for IPOP LLC Resonant Converter with Considering Voltage Gain Model and Current Sharing

    Thursday, March 26, 2026
    11:20 AM - 11:40 AM CT
    Location: 214D
    EV fast charging increasingly relies on parallel LLC converters, where parameter deviations in magnetics and capacitors can cause severe current imbalance. While coupled inductors have been explored for current sharing, prior studies have not systematically incorporated their effect into the resonant gain model nor provided design guidelines. This paper presents a comprehensive analysis of interleaved parallel-output (IPOP) LLC converters with coupled inductors, integrating their impact on both voltage gain characteristics and current balancing ratio. A quantitative methodology is developed to guide the selection of coupling inductance for targeted current sharing, and is validated on a 1 kW prototype with 400 V input, 100–200 V output, under 7% resonant capacitance and 10% resonant inductance deviations.