WIDE INPUT SERIES HALF-BRIDGE LLC RESONANT CONVERTER AND CONTROL STRATEGY

Zhao Yongxiu; Jia Haoyang; Wang Chongjie; Lei Ming; Liu Zeiwei

doi:10.19912/j.0254-0096.tynxb.2025-0587

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (8) : 467-478. DOI: 10.19912/j.0254-0096.tynxb.2025-0587

WIDE INPUT SERIES HALF-BRIDGE LLC RESONANT CONVERTER AND CONTROL STRATEGY

Zhao Yongxiu^1,2, Jia Haoyang^1,2, Wang Chongjie³, Lei Ming^1,2, Liu Zeiwei⁴

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Abstract

Aiming at the problems such as narrow input voltage gain range and large voltage stress existing in traditional full-bridge or half-bridge LLC converters, a wide input voltage series half-bridge LLC resonant converter is proposed. By analyzing the converter topology, the front-stage series half-bridge structure can realize the switching tube voltage stress halving, and the dual resonant cavity common resonant inductor can realize the two-phase automatic current equalization, which verifies its automatic current equalization characteristics. Under the premise of ensuring the efficiency, by analyzing the working principle of high and low gain modes, the frequency doubling technique is introduced to widen the input voltage range, and a hybrid PSM-PWM-PFM control method is proposed to realize the stable switching between modes. In addition, by analyzing the principle of input capacitor voltage imbalance, a PSM-PWM hybrid equalization control method is proposed to achieve input capacitor voltage balance. Finally, a prototype with an input voltage of 100-400 V and a full load of 600 W is built to verify the correctness of the proposed theoretical analysis and the feasibility of the proposed control strategy.

Key words

series half-bridge topology / wide input voltage range / input capacitor voltage equalization control / PSM-PWM-PFM hybrid mode control / PSM-PWM hybrid voltage equalization control

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Zhao Yongxiu, Jia Haoyang, Wang Chongjie, Lei Ming, Liu Zeiwei. WIDE INPUT SERIES HALF-BRIDGE LLC RESONANT CONVERTER AND CONTROL STRATEGY[J]. Acta Energiae Solaris Sinica. 2026, 47(8): 467-478 https://doi.org/10.19912/j.0254-0096.tynxb.2025-0587

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