拓扑变换型LLC-C谐振软开关直流变换器

doi:10.19595/j.cnki.1000-6753.tces.L80020

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Abstract In this paper, a topology morphing LLC-C resonant soft-switching DC-DC converter is proposed. It successfully integrates two simple resonant structures together and adopts auxiliary switches to regulate the equivalent circuit architectures. Under the rating condition, the converter operates as LLC circuit for high-efficiency operation; when the input voltage is relatively high, the converter enters the LCCL mode automatically so that wide voltage gain range as well as relatively high efficiency is achieved. Furthermore, the loss distribution issue is analyzed and calculated. The intersection point of efficiency curves in the two circuit modes is selected as the optimal switching point of the mode transformation, which provides the foundation for the operating mode design. Finally, in order to verify the principle feasibility of the proposed converter, the experimental results are provided. When the input voltage varies from 110V to 400V, the output voltage is maintained at 200V constantly, and the corresponding voltage gain is from 1.8 to 0.5. Meanwhile, the converter efficiency is above 90%, up to 97.5%. The high efficiency of the converter in wide gain range makes it highly suitable for the renewable energy generation applications, where voltage range and efficiency issues are always required strictly.

Key words： Topology morphing soft-switching DC-DC converter LLC converter LCCL converter

Received: 10 May 2018 Published: 26 September 2019

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