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Dual-Phase Shifting Strategy for CLLC Resonant Converters

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Abstract

The CLLC resonant converter has the advantages of bidirectional power transmission, natural soft switching, and wide range voltage output. However, the gain curve is relatively smooth during high-frequency light-load operation, and it is difficult to adjust through frequency conversion; the traditional fundamental harmonic approximation (FHA) method has a large error in calculating the gain at a position away from the resonance point, which brings difficulties to the design. In order to better design the converter, this paper proposes a dual phase-shift (DPS) control method based on time-domain analysis, which can achieve a wide voltage range output without losing soft switching, and has constant current source output characteristics. Firstly, the time-domain model of the CLLC converter is analyzed, and the output voltage gain and soft switching range under DPS control are solved; then a simulation is built for verification; finally, a 200/80 V, rated power 500 W full-bridge CLLC resonant converter experimental prototype is built. The experimental results prove that the converter has good soft switching range and constant current source output characteristics.

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Acknowledgements

This work was supported by The National Natural Science Foundation of China (51777167) and National Natural fund Youth Project (51604217).

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Authors and Affiliations

  1. School of Electrical and Control Engineering, Xi’an University of Science and Technology, Xi’an, 710054, China

    Dangshu Wang, Licong Zhao, Menghu Chang, Yuxuan Yang, Zhimin Guan & Ruchuan Zhang

  2. Xi’an Key Laboratory of Electrical Equipment Condition Monitoring and Power Supply Security, Xi’an, 710054, China

    Dangshu Wang, Licong Zhao, Menghu Chang, Yuxuan Yang, Zhimin Guan & Ruchuan Zhang

  3. School of Science Xi’an, University of Science and Technology, Xi’an, 710054, China

    Xinxia Wang

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  1. Dangshu Wang
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  2. Licong Zhao
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  3. Menghu Chang
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  4. Yuxuan Yang
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  5. Zhimin Guan
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Correspondence to Licong Zhao.

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Wang, D., Zhao, L., Chang, M. et al. Dual-Phase Shifting Strategy for CLLC Resonant Converters. J. Electr. Eng. Technol. 19, 2347–2360 (2024). https://doi.org/10.1007/s42835-023-01755-x

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  • DOI: https://doi.org/10.1007/s42835-023-01755-x

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