An Optimized Control Method of Soft-Switching and No Backflow Power for LLC Resonant-Type Dual-Active-Bridge DC-DC Converters

Zimeng Li, Mingxue Li, Yushun Zhao, Zixiang Wang, Dongsheng Yu and Ruidong Xu ()
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Zimeng Li: School of Electrical Engineering, China University of Mining and Technology, Xuzhou 221116, China
Mingxue Li: School of Electrical Engineering, China University of Mining and Technology, Xuzhou 221116, China
Yushun Zhao: School of Electrical Engineering, China University of Mining and Technology, Xuzhou 221116, China
Zixiang Wang: School of Electrical Engineering, China University of Mining and Technology, Xuzhou 221116, China
Dongsheng Yu: School of Electrical Engineering, China University of Mining and Technology, Xuzhou 221116, China
Ruidong Xu: School of Electrical Engineering, China University of Mining and Technology, Xuzhou 221116, China

Mathematics, 2023, vol. 11, issue 2, 1-13

Abstract: The LLC-type resonant dual-active-bridge (LLC-DAB) DC-DC converter with a high voltage gain, high power density, and low backflow power has attracted increasing attention in recent years. However, its soft-switching and backflow power problems are still not solved, so the improvements to these problems are studied in this paper. Based on the dual phase shift (DPS) modulation method, the operating characteristics are analyzed, and a soft-switching and no backflow power modulation curve is established based on the voltage-current time-domain characteristics. On this basis, a soft-switching and no backflow power optimized control method based on DPS modulation is proposed to achieve soft-switching operation and eliminate backflow power. Due to the complex time-domain characteristics of the resonant tank voltage and current, the relationship between the phase shift ratios is fitted and optimized with this method based on the soft-switching and no backflow power characteristic curve, and the optimized results of the phase shift ratio under different operating conditions are obtained. The simulation results indicate that the soft-switching operation of the LLC-DAB converter can be achieved with the optimized control method proposed in this paper, and the backflow power is effectively eliminated.

Keywords: LLC-type resonant dual-active-bridge; soft-switching; backflow power; optimized control (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2023
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