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    Circuits and Systems

    T21.4 - Non-Linear Discrete Time Modeling of a 1 MHz Dab Converter

    Wednesday, March 25, 2026
    2:30 PM - 2:50 PM CT
    Location: 217A
    For dual active bridge (DAB) converters operating at multi-MHz switching frequencies, particularly under light-load conditions, conventional reduced-order and averaging approaches often lose accuracy since they neglect dead-time effects, which occupy a significant portion of the switching cycle. To address this limitation, a discrete-time small-signal model of the T-network DAB is proposed, capturing the influence of zero-voltage switching (ZVS) intervals on converter dynamics as well as the impact of multi-phase-shift modulation strategies. This nonlinear, time-invariant state-space formulation serves as a robust foundation for controller design, facilitating accurate realization of the desired bandwidth and transient response without the need for repeated design iterations. Finally, the proposed strategy is validated on 160 V to 120 V, 1 kW 1 MHz DAB hardware proof-of-concept which resulted in only a 0.2% error in the magnitude of the output voltage frequency response.