RESEARCH ON HIGH GAIN RATIO DUAL LLC RESONANT CONVERTER

Zhang Tao; Zhang Yafei; Zhang Li; Han Qinglin; Li Yunfei; Bai Wenlong

doi:10.19912/j.0254-0096.tynxb.2025-0631

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (8) : 487-497. DOI: 10.19912/j.0254-0096.tynxb.2025-0631

RESEARCH ON HIGH GAIN RATIO DUAL LLC RESONANT CONVERTER

Zhang Tao^1,2, Zhang Yafei¹, Zhang Li^1,3, Han Qinglin¹, Li Yunfei¹, Bai Wenlong¹

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Abstract

To address the problem that conventional LLC resonant converters have to drastically extend the operating frequency range to realize wide voltage gain, which further leads to a prominent reduction in the overall system efficiency, a high-gain-ratio dual LLC resonant converter （HGRD-LLC） is proposed in this paper.The proposed converter adopts dual resonant tanks with modulation of distinct switching drive signals. By operating the half-bridge and full-bridge LLC resonant converters independently or in combination, five operating modes with different voltage gains are obtained. While maintaining the inherent merits of LLC resonant converters across all modes, the topology achieves a wide output voltage gain range and substantially improves the conversion efficiency.The voltage gain of the presented converter is derived based on the fundamental harmonic approximation （FHA）, and the zero-voltage switching（ZVS）constraint conditions of the converter are quantified. Finally, an experimental prototype with an output voltage range of 60-480 V and a maximum power rating of 960 W is built to verify the feasibility of the proposed topology.

Key words

LLC resonant converter / zero-voltage switching / wide voltage gain / dual resonant tanks / switching frequency / multi-mode control

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Zhang Tao, Zhang Yafei, Zhang Li, Han Qinglin, Li Yunfei, Bai Wenlong. RESEARCH ON HIGH GAIN RATIO DUAL LLC RESONANT CONVERTER[J]. Acta Energiae Solaris Sinica. 2026, 47(8): 487-497 https://doi.org/10.19912/j.0254-0096.tynxb.2025-0631

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