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Optimization Method for Backflow Power of Half-bridge CLL Resonant Converter Based on Equivalent Resonant Cavity
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Hewei HUANG  Student Member, CPSS1, Taiqiang CAO1, Wei LI2, Junhong GUO1
Journal of Power Supply | 2025, 23(6) : 32 - 44
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Journal of Power Supply | 2025, 23(6): 32-44
• DC-DC Converters •
Optimization Method for Backflow Power of Half-bridge CLL Resonant Converter Based on Equivalent Resonant Cavity
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Hewei HUANG  Student Member, CPSS1, Taiqiang CAO1, Wei LI2, Junhong GUO1
Affiliations
  • 1.School of Electrical Engineering and Electronic Information, Xihua University, Chengdu 610039, China
  • 2.Sichuan Aerospace Fiberhome Servo Control Technology Co., Ltd., Chengdu 611130, China
Published: 2025-10-30 doi: 10.13234/j.issn.2095-2805.2025.6.32
Outline
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Aimed at the problem of backflow power generated by a half-bridge CLL resonant converter, a parameter design method based on the equivalent resonant cavity is proposed to optimize the backflow power and improve the conversion efficiency. First, according to the operating characteristics of an LLC converter, it is concluded that the value of backflow power can be characterized by the zero-crossing time of resonant current. Under the conditions of satisfying the voltage gain and zero-voltage switching of a switch on the primary side, the optimal resonant cavity parameters are selected according to the function curve representing the backflow power. Second, through the quantitative relationship between the CLL and the LLC resonant cavity, the resonant cavity is adjusted to be equivalent, so that the CLL has the same backflow power characteristics as the LLC. Finally, two sets of resonant cavity parameters meeting the design conditions were used for comparison and verification through simulations and experiments. Results show that under the condition of equivalent resonant cavity, both converters had the same zero-crossing time of resonance current, and the conversion efficiency was improved by about 1.3% under the conditions of quasi-resonance and full load, thus verifying the correctness and feasibility of theoretical analysis.

Half-bridge resonant converter  /  backflow power  /  conversion efficiency  /  equivalent resonant cavity  /  voltage gain  /  soft switch
黄何伟中国电源学会学生会员, 曹太强, 李蔚, 郭军宏. 基于等效谐振腔的半桥CLL谐振变换器回流功率优化方法. 电源学报, 2025 , 23 (6) : 32 -44 . DOI: 10.13234/j.issn.2095-2805.2025.6.32
Hewei HUANG, Taiqiang CAO, Wei LI, Junhong GUO. Optimization Method for Backflow Power of Half-bridge CLL Resonant Converter Based on Equivalent Resonant Cavity[J]. Journal of Power Supply, 2025 , 23 (6) : 32 -44 . DOI: 10.13234/j.issn.2095-2805.2025.6.32
Funding
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  • Sichuan Science and Technology Program(2023YFG0338; 2024ZYD0250)
  • Science and Technology Projects in Chengdu(2024-YF08-00033-GX; 2024-YF08-00016-GX; 2024-YF08-00136-GX; 2024-YF08-00082-GX)
Appendix
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Year 2025 volume 23 Issue 6
53
13
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Article Info
doi: 10.13234/j.issn.2095-2805.2025.6.32
  • Receive Date：2022-09-05
  • Online Date：2026-10-26
  • Published：2025-10-30
Article Data
Affiliations
History
  • Received：2022-09-05
  • Revised：2023-02-20
  • Accepted：2023-03-07
Funding
Sichuan Science and Technology Program(2023YFG0338; 2024ZYD0250)
Science and Technology Projects in Chengdu(2024-YF08-00033-GX; 2024-YF08-00016-GX; 2024-YF08-00136-GX; 2024-YF08-00082-GX)
Affiliations
    1.School of Electrical Engineering and Electronic Information, Xihua University, Chengdu 610039, China
    2.Sichuan Aerospace Fiberhome Servo Control Technology Co., Ltd., Chengdu 611130, China
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