辅助半桥调节的定频LLC谐振功率变换器

doi:10.19595/j.cnki.1000-6753.tces.180303

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Abstract This paper proposes a fixed-frequency LLC resonant converter adjusted by auxiliary half-bridge. The LLC half-bridge and the auxiliary half-bridge both perform isolated power conversion. The equivalent resonant parameters of half-bridge LLC are changed only by adjusting the timing of control signal without adding extra components so that the regulation of output voltage can be implemented. Compared with the traditional frequency modulation, fixed-frequency control can facilitate the optimization of magnetic components. The magnetizing inductance has less impact on the gain characteristics, and the efficiency at light load is improved. In addition, the auxiliary half-bridge only deals with a small part of the power, and the whole circuit retains the characteristics of the original LLC converter. The operation principle and steady state analysis are discussed in this paper. Finally, a prototype sample with 300 V input and 48 V/4 A output is built, and the feasibility of the proposed converter is verified by experimental results.

Key words： Auxiliary half-bridge LLC resonant fixed frequency phase shift control

Received: 12 March 2018 Published: 17 April 2019

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TM46

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	Qian Chenghui
	Qian Ting

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Qian Chenghui,Qian Ting. A Fixed-Frequency LLC Resonant Converter Adjusted by Auxiliary Half-Bridge[J]. Transactions of China Electrotechnical Society, 2019, 34(7): 1459-1467.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.180303 OR https://dgjsxb.ces-transaction.com/EN/Y2019/V34/I7/1459

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