Optimized Extended Phase Shift Modulation for Dual Active Bridge Converters in Automotive Battery Systems

Inhalt:
This paper proposes an optimized extended phase shift modulation (EPSM) for dual active bridge (DAB) converters in vehicle-mounted battery systems. It analyzes the operational principles and power transfer dynamics under EPSM, focusing on dual-phase shift variables (D1, D2). A multi-objective strategy coordinates zero-voltage switching (ZVS), peak current, and circulating power constraints. By dynamically tuning D1 and D2 across power levels, the method extends the ZVS range, reduces peak current stress, and minimizes circulating power versus conventional schemes, while maintaining >95% efficiency under wide voltage/load variations. Simulations validate its effectiveness for high-efficiency, bidirectional energy transfer in automotive applications.