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Rectifier Current Control for an LLC Resonant Converter Based on a Simplified Linearized Model

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)

  • Liangle Xiao

    (China Electric Power Research Institute, Wuhan 430074, China)

  • Guozheng Hu

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

  • Qisheng Liu

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

Abstract

In this paper, a rectifier current control for an LLC resonant converter is proposed, based on a simplified, two-order, linearized model that adds a rectifier current feedback inner loop to improve dynamic performance. Compared to the traditional large-signal model with seven resonant states, this paper utilizes a rectifier current state to represent the characteristics of the resonant states, simplifying the LLC resonant model from seven orders to two orders. Then, the rectifier current feedback inner loop is proposed to increase the control system damping, improving dynamic performance. The modeling and design methodology for the LLC resonant converter are also presented in this paper. A frequency analysis is conducted to verify the accuracy of the simplified model. Finally, a 200 W LLC resonant converter prototype is built to verify the effectiveness of the proposed control strategy. Compared to a traditional single-loop controller, the settling time and voltage droop were reduced from 10.8 ms to 8.6 ms and from 6.8 V to 4.8 V, respectively, using the proposed control strategy.

Suggested Citation

  • Zhijian Fang & Junhua Wang & Shanxu Duan & Liangle Xiao & Guozheng Hu & Qisheng Liu, 2018. "Rectifier Current Control for an LLC Resonant Converter Based on a Simplified Linearized Model," Energies, MDPI, vol. 11(3), pages 1-14, March.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:3:p:579-:d:135168
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    Citations

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    Cited by:

    1. Zhiqin Zhao & Xiaoqiong He, 2019. "Research on Digital Synchronous Rectification for a High-Efficiency DC-DC Converter in an Auxiliary Power Supply System of Magnetic Levitation," Energies, MDPI, vol. 13(1), pages 1-19, December.
    2. Yuan-Chih Lin & Ding-Tang Chen & Ching-Jan Chen, 2019. "Flux-Balance Control for LLC Resonant Converters with Center-Tapped Transformers," Energies, MDPI, vol. 12(17), pages 1-18, August.

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