为解决传统LLC谐振变换器依靠大幅拓宽工作频率范围实现宽电压增益,进而造成系统整体效率明显降低的问题,提出一种高增益比的双LLC谐振变换器（HGRD-LLC）。该变换器采用双谐振腔,使用不同开关驱动信号的调制,通过半桥、全桥LLC谐振变换器独立或组合的工作方式,获得增益不同的5种工作模式,在全模式下保留LLC谐振变换器优势的同时可实现较宽的输出电压增益,能有效提高变换器的效率。将所提变换器根据基波近似法推导电压增益,并明确变换器零电压开通（ZVS）约束条件。最后构建一台输出电压60~480 V、最大功率为960 W的实验样机,以验证所提拓扑的可行性。
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.
关键词
LLC谐振变换器 /
零电压开通 /
宽增益 /
双谐振腔 /
开关频率 /
多模态控制
Key words
LLC resonant converter /
zero-voltage switching /
wide voltage gain /
dual resonant tanks /
switching frequency /
multi-mode control
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基金
国家自然科学基金（52177039）; 河南省科技创新团队基金（CXTD2017085）; 河南省高等学校重点科研项目（24A470006）
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