Optimal Asymmetric Duty Modulation for Dual Active Bridge Converters with DC Blocking Capacitors

Peng Dai (), Shuyu Liu, Shiqi Fang and Zheng Gong
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Peng Dai: School of Electrical Engineering, China University of Mining and Technology, Xuzhou 221116, China
Shuyu Liu: School of Electrical Engineering, China University of Mining and Technology, Xuzhou 221116, China
Shiqi Fang: School of Electrical Engineering, China University of Mining and Technology, Xuzhou 221116, China
Zheng Gong: School of Electrical Engineering, China University of Mining and Technology, Xuzhou 221116, China

Energies, 2023, vol. 16, issue 18, 1-18

Abstract: Aiming at the optimization of current stress with low voltage ratio and full ZVS, a control method combining variable duty cycle and phase shift was proposed based on dual active bridge (DAB) converters with DC blocking capacitors. By adding DC bias to the DC blocking capacitors, asymmetric duty modulation (ADM) can adjust the bias as needed. Based on the theoretical analysis of steady-state operation, the operating modes can be divided into eight modes. According to the features of each mode, equivalent circuits are established. The transmission power and the boundary of zero-voltage-switching (ZVS) are deduced through a detailed analysis of each mode. Based on the theoretical deduction, ADM is more suitable for a low voltage ratio. Verified by experiment, optimized asymmetric duty modulation (OADM) can increase efficiency by 3.58%, 6.57%, 8.81%, and 10.33% compared with DPS when P is equal to 0.36 and m is equal to 0.4, 0.3, 0.2, and 0.1, respectively. Using this method, the current stress of the converter is lighter than that under regular modulation when the voltage ratio m ≤ 0.5 with full ZVS.

Keywords: DC blocking capacitor; DAB; asymmetric duty modulation; ZVS; current stress (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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