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Improved pulse width modulation strategy for CLLLC resonant converter
ID：94 View Protection：ATTENDEE Updated Time：2025-10-11 22:51:41 Hits：206 Poster Presentation

Start Time：2025-11-09 09:05（Asia/Shanghai）

Duration：1min

Session：P Poster presentation » P22.Power electronics technology and application

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Abstract
To address the issue of low efficiency under light load conditions when CLLLC converters employ fixed-frequency pulse width modulation, this paper proposes a fixed-frequency improved pulse width modulation strategy to optimize converter efficiency. First, the voltage gain expression of the converter is derived based on the First Harmonic Approximation (FHA) method. Subsequently, analytical expressions for soft switching implementation conditions are established through time-domain analysis, and the efficiency optimization mechanism of fixed-frequency improved pulse width modulation is thoroughly analyzed. Furthermore, a modulation parameter selection principle based on soft switching range is proposed. Experimental validation demonstrates that the proposed modulation strategy can significantly improve converter efficiency, with particularly pronounced effects under light load conditions. At 20% load, the converter efficiency reaches 97.3%. Under light load conditions, the efficiency improvement can be up to 4.27% compared to ordinary pulse width modulation .
 
Keywords
CLLLC resonant converter,fixed-frequency improved pulse width modulation,efficiency optimization,soft switching
Speaker
Yan Mao
student Huazhong University of Science and Technology

Submission Author
Yan Mao Huazhong University of Science and Technology
Xiang Li Huazhong University of Science and Technology
Xin Hu Huazhong University of Science and Technology
Jiajun Yang Huazhong University of Science and Technology
Bangyin Liu Huazhong University of Science and Technology
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Important Date

  • Conference Date

    Nov 07

    2025

    to

    Nov 09

    2025

  • Oct 30 2025

    Draft paper submission deadline

  • Nov 10 2025

    Registration deadline

Sponsored By
IEEE西南交通大学IAS学生分会
Organized By
西南交通大学电气工程学院
SPACI车网关系研究室
四川大学电力系统稳定与高压直流输电研究团队
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