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Parameters analysis and control strategy combined with synchronous rectification technology for bidirectional CLLC resonant converter

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Abstract

Bidirectional CLLC resonant converter can realize the efficient two-way transmission of electric energy, which saves the design cost and reduces the volume of DC–DC converter. It is gradually applied in many electric energy conversion fields because of its advantages of high efficiency, high power density and high reliability. In this paper, the circuit structure and parameters of bidirectional CLLC resonant converter are analyzed, which can provide theoretical basis for the design of a circuit. In order to reduce the transmission power loss of the converter, the bidirectional CLLC resonant converter can adopt secondary-side synchronous rectification to improve the output efficiency of the system. According to the range of working frequency, a digital synchronous rectification method for adjusting the on phase and duty cycle of MOSFETs at the output side of the converter is applied, and its operation states are analyzed in detail. On this basis, the control strategy combined with synchronous rectification for bidirectional CLLC resonant converter is designed. In order to realize the conversion from 150 V to 95–120 V in some power converter applications, a 400-W bidirectional CLLC resonant converter is built by selecting appropriate circuit parameters. Experiments on voltage gain, soft switching characteristics and output efficiency under different working states are carried out to verify the effectiveness of the synchronous rectification control method. The results show that the synchronous rectification control strategy applied to the bidirectional CLLC resonant converter can effectively reduce the loss of the converter and significantly improve the system output efficiency.

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Authors and Affiliations

  1. School of Automation, Northwestern Polytechnical University, Xi’an, 710129, China

    Xiaobo Liu, Xiaohua Wu & Hao Wang

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  1. Xiaobo Liu
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  2. Xiaohua Wu
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  3. Hao Wang
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Contributions

XL done investigation, formal analysis, methodology, writing—original draft, writing—review and editing. XW did Guidance. HW investigated the study.

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Correspondence to Xiaobo Liu.

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Liu, X., Wu, X. & Wang, H. Parameters analysis and control strategy combined with synchronous rectification technology for bidirectional CLLC resonant converter. Electr Eng 105, 1397–1412 (2023). https://doi.org/10.1007/s00202-023-01745-2

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  • DOI: https://doi.org/10.1007/s00202-023-01745-2

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