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        Dual-Phase Shifting Strategy for CLLC Resonant Converters

        Wang Dangshu,Zhao Licong,Chang Menghu,Yang Yuxuan,Guan Zhimin,Zhang Ruchuan,Wang Xinxia 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.4

        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 diffi cult 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 diffi culties 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 verifi cation; fi nally, 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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