Applying a Current Sharing Method Based on Partial Energy Processing to Multiphase LLC Resonant Converters

Yue-Lin Lee, Han-Hsiang Chen and Kuo-Ing Hwu ()
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Yue-Lin Lee: Delta Electronics Inc., No. 186, Ruiguang Road, Neihu District, Taipei 114501, Taiwan
Han-Hsiang Chen: Monolithic Power Systems: MPS, 29F, No. 97, Section 1, Xintai 5th Road, Xizhi District, New Taipei City 22175, Taiwan
Kuo-Ing Hwu: Department of Electrical Engineering, National Taipei University of Technology, No. 1, Section 3, Zhongxiao East Road, Taipei 10608, Taiwan

Energies, 2024, vol. 17, issue 15, 1-23

Abstract: In this paper, partial energy processing is applied to the current sharing technique for multiphase LLC resonant converters. The proposed circuit consists of an LLC resonant converter and a flyback converter, where the flyback converter is only used for partial energy processing. The input voltage of the LLC resonant converter is fine-tuned by the flyback converter to solve the problem of a voltage gain difference between the two phases of the LLC resonant converter caused by the error of the resonant tank components, which prevents the output current from being nonequalized. Since the compensation power is much smaller than the output power, and only one phase will be during circuit operation, the impact on the overall efficiency is minimal. Due to the low dependence between the LLC resonant converter and the flyback converter, they are operated at different switching frequencies. In addition, due to the low dependence between each phase, the circuit can be expanded using odd and even phases.

Keywords: LLC resonant converter; flyback converter; active current sharing; multiphase converter; current sharing error percentage (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: 2024
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