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Flux-Balance Control for LLC Resonant Converters with Center-Tapped Transformers

Author

Listed:
  • Yuan-Chih Lin

    (Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan; No. 1, Sec. 4, Roosevelt Rd., Taipei 10617, Taiwan)

  • Ding-Tang Chen

    (Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan; No. 1, Sec. 4, Roosevelt Rd., Taipei 10617, Taiwan)

  • Ching-Jan Chen

    (Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan; No. 1, Sec. 4, Roosevelt Rd., Taipei 10617, Taiwan)

Abstract

LLC resonant converters with center-tapped transformers are widely used. However, these converters suffer from a flux walking issue, which causes a larger output ripple and possible transformer saturation. In this paper, a flux-balance control strategy is proposed for resolving the flux walking issue. First, the DC magnetizing current generated due to the mismatched secondary-side leakage inductances, and its effects on the voltage gain are analyzed. From the analysis, the flux-balance control strategy, which is based on the original output-voltage control loop, is proposed. Since the DC magnetizing current is not easily measured, a current sensing strategy with a current estimator is proposed, which only requires one current sensor and is easy to estimate the DC magnetizing current. Finally, a simulation scheme and a hardware prototype with rated output power 200 W, input voltage 380 V, and output voltage 20 V is constructed for verification. The simulation and experimental results show that the proposed control strategy effectively reduces the DC magnetizing current and output voltage ripple at mismatched condition.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:17:p:3211-:d:259492
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    References listed on IDEAS

    as
    1. 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.
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    Cited by:

    1. Hwa-Pyeong Park & Mina Kim & Jee-Hoon Jung, 2020. "A Comprehensive Overview in Control Algorithms for High Switching-Frequency LLC Resonant Converter," Energies, MDPI, vol. 13(17), pages 1-17, August.

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