兼顾稳态效率和暂态升压能力的LLC变换器

doi:10.19595/j.cnki.1000-6753.tces.181977

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Abstract For the special requirements of steady-state efficiency and transient boost capability, such as front-end power supplies, an improved half-bridge(HB) LLC resonant converter was obtained by adding an auxiliary switching network. In normal operation, the auxiliary switch keeps off and pulse frequency modulation(PFM) is employed to regulate the output voltage. After an ac dropout, the auxiliary switching network operates with pulse width modulation(PWM) to improve voltage gain. The only design consideration of magnetizing inductance is the performance of steady state, regardless of voltage conversion gain range, resulting in reduced circulating current due to small magnetizing inductance. The feasibility and effectiveness of the proposed converter are verified by experiment results.

Key words： LLC resonant converter wide voltage range pulse width modulation(PWM) active rectifier

Received: 28 December 2018 Published: 28 February 2020

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TM46

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	Tang Xinxi
	Xing Yan
	Wu Hongfei
	Zhao Jian

Cite this article:

Tang Xinxi,Xing Yan,Wu Hongfei等. An Improved LLC Converter Considering Steady-State Efficiency and Transient Boost Capability[J]. Transactions of China Electrotechnical Society, 2020, 35(4): 767-774.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.181977 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/I4/767

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