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为了解决LLC谐振变换器在宽电压输入下整体效率有限的问题，采用Boost变换器+全桥LLC变换器+同步整流的电路架构，完成1 000 W 变换器设计。针对该电路架构，优化LLC谐振变换器的关键参数设计方法。通过对LLC谐振变换器的工作原理进行分析，结合零电压导通、零电流关断条件与变换器增益特性，优化电感系数取值，并给出了LLC谐振变换器关键参数设计的具体流程。最后，采用所提出的参数设计方法搭建实验样机，实验结果表明，该变换器在直流120~380 V宽电压输入范围内最高可达95%的转换效率，证明了其在实际应用中的巨大潜力和优势。
Abstract：In order to improve the overall efficiency of LLC resonant converters under wide input voltage conditions, a circuit architecture comprising Boost converter, full⁃bridge LLC converter and synchronous rectification is developed for the design of a 1 000 W converter. For the proposed circuit configuration, a design method for key parameters of the LLC resonant converter is optimized. The operating principles of the LLC resonant converter are analyzed, the value selection of inductance coefficient is optimized by integrating zero⁃voltage switching (ZVS) and zero⁃current turn⁃off with the gain characteristics of the converter, and the detailed process for designing critical parameters of the LLC resonant converter is provided. The proposed parameter design method is used to establish experimental prototype. The experimental results show that the converter can achieve a maximum conversion efficiency of 95% within a wide DC input voltage range from 120 V to 380 V, demonstrating its great potential and advantages in practical applications.
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基本信息:
DOI：10.16652/j.issn.1004⁃373x.2026.08.002
引用信息:
[1]杨松霖,洪应平,杨学良.基于全桥LLC的宽电压输入DC/DC变换器参数设计[J],2026,49(8):7⁃13.DOI:10.16652/j.issn.1004⁃373x.2026.08.002.