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Stability Analysis and Trigger Control of LLC Resonant Converter for a Wide Operational Range

Author

Listed:
  • Zhijian Fang

    (School of Electrical Engineering, Wuhan University, Wuhan 430072, China)

  • Junhua Wang

    (School of Electrical Engineering, Wuhan University, Wuhan 430072, China)

  • Shanxu Duan

    (State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China)

  • Jianwei Shao

    (School of Electrical Engineering, Wuhan University, Wuhan 430072, China)

  • Guozheng Hu

    (School of Electrical and Electronic Engineering, Hubei Polytechnic University, Huangshi 435003, China)

Abstract

The gain of a LLC resonant converter can vary with the loads that can be used to improve the efficiency and power density for some special applications, where the maximum gain does not apply at the heaviest loads. However, nonlinear gain characteristics can make the converters unstable during a major disturbance. In this paper, the stability of an LLC resonant converter during a major disturbance is studied and a trigger control scheme is proposed to improve the converter’s stability by extending the converter’s operational range. Through in-depth analysis of the gain curve of the LLC resonant converter, we find that the switching frequency range is one of the key factors determining the system’s stability performance. The same result is also obtained from a mathematical point of view by utilizing the mixed potential function method. Then a trigger control method is proposed to make the LLC resonant converter stable even during a major disturbance, which can be used to extend the converter’s operational range. Finally, experimental results are given to verify the analysis and proposed control scheme.

Suggested Citation

  • Zhijian Fang & Junhua Wang & Shanxu Duan & Jianwei Shao & Guozheng Hu, 2017. "Stability Analysis and Trigger Control of LLC Resonant Converter for a Wide Operational Range," Energies, MDPI, vol. 10(10), pages 1-21, September.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:10:p:1448-:d:112706
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    Citations

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    Cited by:

    1. Min-Soo Kim & Do-Hyun Kim & Dong-Keun Jeong & Jang-Mok Kim & Hee-Je Kim, 2020. "Soft Start-Up Control Strategy for Dual Active Bridge Converter with a Supercapacitor," Energies, MDPI, vol. 13(16), pages 1-19, August.
    2. Houssein Al Attar & Mohamed Assaad Hamida & Malek Ghanes & Miassa Taleb, 2023. "Review on Modeling and Control Strategies of DC–DC LLC Converters for Bidirectional Electric Vehicle Charger Applications," Energies, MDPI, vol. 16(9), pages 1-28, May.
    3. Shu-huai Zhang & Yi-feng Wang & Bo Chen & Fu-qiang Han & Qing-cui Wang, 2018. "Studies on a Hybrid Full-Bridge/Half-Bridge Bidirectional CLTC Multi-Resonant DC-DC Converter with a Digital Synchronous Rectification Strategy," Energies, MDPI, vol. 11(1), pages 1-22, January.
    4. Pedro J. Villegas & Juan A. Martín-Ramos & Juan Díaz & Juan Á. Martínez & Miguel J. Prieto & Alberto M. Pernía, 2017. "A Digitally Controlled Power Converter for an Electrostatic Precipitator," Energies, MDPI, vol. 10(12), pages 1-24, December.
    5. Hussain Humaira & Seung-Woo Baek & Hag-Wone Kim & Kwan-Yuhl Cho, 2019. "Circuit Topology and Small Signal Modeling of Variable Duty Cycle Controlled Three-Level LLC Converter," Energies, MDPI, vol. 12(20), pages 1-21, October.

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