MULTI-MODE LLC RESONANT CONVERTER FOR ULTRA-WIDE OUTPUT VOLTAGE RANGE

Fang Wei; Shi Qingping; Zhou Mi; Wang Leiyu; Liu Xiaodong; Liu Sucheng

doi:10.19912/j.0254-0096.tynxb.2024-1649

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (1) : 366-376. DOI: 10.19912/j.0254-0096.tynxb.2024-1649

MULTI-MODE LLC RESONANT CONVERTER FOR ULTRA-WIDE OUTPUT VOLTAGE RANGE

Fang Wei^1,2, Shi Qingping^1,2, Zhou Mi^1,2, Wang Leiyu^1,2, Liu Xiaodong^1,2, Liu Sucheng^1,2

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Abstract

A multi-mode LLC resonant converter for an ultra-wide output voltage range is proposed to address the problems of an excessively wide range of switching frequency variation and low transfer efficiency of conventional LLC resonant converter for wide output voltage applications. The converter realizes the topological reconfiguration of the bridge rectifier and the voltage doubling rectifier by controlling the auxiliary switches of the dual windings on the secondary side of the transformer. Combined with the circuit modal analysis,the voltage gain and the relationship with the normalized parameters k and Q are discussed,and the parametric design rules of the resonant elements are given. The switching control between different voltage gain modes is designed, and an experimental prototype with an input of 400 V and a maximum power of 1.3 kW is built. The experimental results show that the converter is able to provide an ultra-wide output voltage range of 50-430 V,a small range of variation in the operating frequency,and a high conversion efficiency, which verifies the feasibility and effectiveness of the proposed topology and control method.

Key words

resonant converters / switching frequency / rectifier / wide voltage gain / mode switching

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Fang Wei, Shi Qingping, Zhou Mi, Wang Leiyu, Liu Xiaodong, Liu Sucheng. MULTI-MODE LLC RESONANT CONVERTER FOR ULTRA-WIDE OUTPUT VOLTAGE RANGE[J]. Acta Energiae Solaris Sinica. 2026, 47(1): 366-376 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1649

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