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Current Stress Suppression Strategy for CLLLC Resonant Converter
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Xinwen ZHANG  Member, CPSS1, Bailin LIU  Member, CPSS1, Shude YANG  Member, CPSS2
Journal of Power Supply | 2026, 24(2) : 91 - 100
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Journal of Power Supply | 2026, 24(2): 91-100
• Power Converter Modeling and Control •
Current Stress Suppression Strategy for CLLLC Resonant Converter
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Xinwen ZHANG  Member, CPSS1, Bailin LIU  Member, CPSS1, Shude YANG  Member, CPSS2
Affiliations
  • 1.School of Electrical and Information Engineering, North Minzu University, Yinchuan 750021, China
  • 2.College of Electrical, Energy and Power Engineering, Yangzhou University, Yangzhou 225127, China
Published: 2026-02-28 doi: 10.13234/j.issn.2095-2805.2026.2.91
Outline
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Under over-resonant operating conditions, a CLLLC resonant converter with frequency modulation control will generate excessive current stress. On the basis, a control strategy based on phase-shift frequency modulation is proposed to suppress the current stress. A resonant current model under phase-shift frequency modulation control is established by the first harmonic approximation method. According to the soft switching condition and transmission power characteristics of the converter, the phase-shift values on the primary and secondary sides of the isolation transformer are obtained. Combined with the switching frequency obtained by frequency modulation control, the resonant current stress is reduced. Finally, a circuit simulation model and an experimental system of the CLLLC resonant converter were built to verify the analytical conclusions, and results show that the proposed strategy has a significant inhibitory effect on current stress.

CLLLC resonant converter  /  current stress  /  frequency modulation control  /  soft switch
张新闻中国电源学会会员, 刘百林中国电源学会会员, 杨树德中国电源学会会员. CLLLC谐振变换器电流应力抑制策略. 电源学报, 2026 , 24 (2) : 91 -100 . DOI: 10.13234/j.issn.2095-2805.2026.2.91
Xinwen ZHANG, Bailin LIU, Shude YANG. Current Stress Suppression Strategy for CLLLC Resonant Converter[J]. Journal of Power Supply, 2026 , 24 (2) : 91 -100 . DOI: 10.13234/j.issn.2095-2805.2026.2.91
Funding
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  • Ningxia Natural Science Foundation(2023AAC03281)
  • National Natural Science Foundation of China(52367018)
Appendix
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Year 2026 volume 24 Issue 2
40
4
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Article Info
doi: 10.13234/j.issn.2095-2805.2026.2.91
  • Receive Date：2023-07-17
  • Online Date：2026-10-29
  • Published：2026-02-28
Article Data
Affiliations
History
  • Received：2023-07-17
  • Revised：2023-09-03
  • Accepted：2023-09-08
Funding
Ningxia Natural Science Foundation(2023AAC03281)
National Natural Science Foundation of China(52367018)
Affiliations
    1.School of Electrical and Information Engineering, North Minzu University, Yinchuan 750021, China
    2.College of Electrical, Energy and Power Engineering, Yangzhou University, Yangzhou 225127, China
References
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