宽输入串联半桥LLC谐振变换器及控制策略

赵永秀; 贾浩洋; 王崇杰; 雷鸣; 刘泽伟

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

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太阳能学报 ›› 2026, Vol. 47 ›› Issue (8) : 467-478. DOI: 10.19912/j.0254-0096.tynxb.2025-0587

宽输入串联半桥LLC谐振变换器及控制策略

赵永秀^1,2, 贾浩洋^1,2, 王崇杰³, 雷鸣^1,2, 刘泽伟⁴

作者信息 +

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

Author information +

文章历史 +

摘要

针对传统全桥或半桥LLC变换器存在输入电压增益范围窄、电压应力大等问题,提出一种宽输入电压串联半桥谐振变换器。通过分析变换器拓扑,前级串联半桥结构可实现开关管电压应力减半。在保证效率的前提下,通过分析高、低增益模式工作原理,引入倍频技术拓宽输入电压范围,并提出一种PSM-PWM-PFM混合控制方法实现模式间稳定切换。此外,通过分析输入电容电压失衡原理,提出一种PSM-PWM混合均压控制方法实现输入电容电压平衡。最后,搭建一台输入电压100~400 V、满载600 W的样机,验证了所提理论分析的正确性和所提控制策略的可行性。

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.

导出引用

赵永秀, 贾浩洋, 王崇杰, 雷鸣, 刘泽伟. 宽输入串联半桥LLC谐振变换器及控制策略[J]. 太阳能学报. 2026, 47(8): 467-478 https://doi.org/10.19912/j.0254-0096.tynxb.2025-0587

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

中图分类号： TM464

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