We study and describe mostly used traditional simplified circuits for full-bridge Zero Voltage Switching-Dual Active Bridge (ZVSDAB)\nconverter and deduce their mathematical model. On this basis, we propose a high-frequency (HF) mathematical model,\nwhich takes into account conduction loss and HF characteristics of the ZVS-DAB converter model. We compare the static and\ndynamic stabilities of the traditional and the proposed HF mathematical model by simulation. Finally, the high-frequency planar\ntransformer (HFPT) with good heat dissipation and the wide band gap (WBG) semiconductor SiC switches with fast switching\nspeed are employed to build a 4.4 kw, 40 KHz experimental prototype to verify the effectiveness of the improved HF circuit of\nZVS-DAB converter. The results show that the proposed HF mathematical model is superior to the traditional one, and it fully\nconsiders the HF characteristics of the circuit and effectively improves the HF oscillation, DC bias, and waveform distortion of the\nZVS-DAB converter.
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