Efficiency Optimization Design of L-LLC Resonant Bidirectional DC-DC Converter

Jing Lu, Xiangqian Tong, Jianwu Zeng, Ming Shen and Jun Yin
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Jing Lu: School of Electrical Engineering, Xi’an University of Technology, Xi’an 710048, China
Xiangqian Tong: School of Electrical Engineering, Xi’an University of Technology, Xi’an 710048, China
Jianwu Zeng: Department of Electrical and Computer Engineering & Technology, Minnesota State University, Mankato, MN 56001, USA
Ming Shen: School of Electrical Engineering, Xi’an University of Technology, Xi’an 710048, China
Jun Yin: School of Electrical Engineering, Xi’an University of Technology, Xi’an 710048, China

Energies, 2021, vol. 14, issue 11, 1-20

Abstract: The new type of L-LLC resonant bidirectional DC-DC converter (L-LLC-BDC) has merits of high efficiency, high-power density and wide gain and power ranges, and it is suitable for energy interface between energy storage systems and DC micro grid. However, the resonances are sensitive to the parasitic parameters, which will deteriorate the efficiency. This paper investigates the intrinsic mechanism of parasitic parameters on the L-LLC-BDC operating principle and working characteristics based on the analysis of working modes and resonance tank. By taking the oscillation of parasitic parameters produced in the stage for the freewheeling stage into consideration, a parameter optimization method is proposed to reduce the resonant current oscillation while maintaining the characteristic of the natural soft switching. The experiment results not only validated the proposed parameter optimization design method, but also testified to the improvement of the efficiency through the minimization of the conduction and switching loss.

Keywords: L-LLC-BDC; resonant parameters; optimization design; mode analysis; MOSFET output capacitance (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: 2021
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