Determination of Inductances and Deadtimes for Generalized MAB Converters

This paper presents a modelling and analysis framework for Multi-Active Bridge (MAB) converters, focusing on power transfer capabilities, soft-switching conditions, and practical design considerations. A novel transformer modelling approach utilizing the mutual-mesh transformation is introduced, enabling the derivation of generalized equivalent circuits for MAB topologies and their representation using practical parameters (leakage and magnetizing inductances). Building upon this model, the paper analyses the transferrable power and establishes critical design trade-offs related to leakage and magnetizing inductance values. Furthermore, the paper derives explicit zero-voltage switching (ZVS) conditions for MAB converters under extended single-phase shift (ESSPS) modulation, specifically addressing the impact of deadtime. Crucially, analytical expressions for the minimum required deadtimes ensuring ZVS are developed. The proposed modelling, theoretical analysis, and derived design guidelines are verified through simulation and experimental results, demonstrating their accuracy and practical utility for optimizing MAB converter performance.