LLC RESONANT CONVERTER WITH HIGH VOLTAGE STEP-DOWN RATIO

Ai Jian; Shen Yehao; Yang Xianbin; Bi Kaitao; Fan Qigao

doi:10.19912/j.0254-0096.tynxb.2024-0210

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (6) : 440-450. DOI: 10.19912/j.0254-0096.tynxb.2024-0210

LLC RESONANT CONVERTER WITH HIGH VOLTAGE STEP-DOWN RATIO

Ai Jian, Shen Yehao, Yang Xianbin, Bi Kaitao, Fan Qigao

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Abstract

The voltage step-down ratio of traditional LLC resonant converters is constrained by transformer turns ratio and switching frequency range, and the voltage stress of the high-voltage side components is high, making it unsuitable for applications with a high step-down ratios. This paper proposes a novel LLC resonant converter with high step-down ratio to address this issue. Its voltage step-down ratio is four times that of a full-bridge LLC resonant converter, and it boasts advantages such as soft switching, self-balancing of input capacitor voltage, low voltage stress on high-voltage side components, and simplified control method. The paper elaborates on its operational mode and operating principle, and under the condition of delayed turn-off of the switching devices, provides a detailed analysis of the self-balancing mechanism of input capacitor voltage in the converter. Finally, by constructing a 2 kW experimental prototype, the paper demonstrates the advantages of the converter and validates the correctness of its operating principles.

Key words

low turns ratio / LLC resonant converter / soft switch / high voltage step-down ratio

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Ai Jian, Shen Yehao, Yang Xianbin, Bi Kaitao, Fan Qigao. LLC RESONANT CONVERTER WITH HIGH VOLTAGE STEP-DOWN RATIO[J]. Acta Energiae Solaris Sinica. 2025, 46(6): 440-450 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0210

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