双向LLC谐振变换器的变频-移相控制方法

doi:10.19595/j.cnki.1000-6753.tces.180631

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Abstract Due to the wide-range applications and soft switching characteristic, bidirectional LLC resonant converters are becoming popular in the fields of electric vehicles, solar power system, power electronic transformers. A better topology of bidirectional LLC resonant converter is first analyzed in this paper. The topology has symmetrical structure in forward mode and backward mode operations, which can realize bidirectional power flow. The operation principle and soft switching characteristic of the topology under pulse-frequency-modulation (PFM) control or phase-shift (PS) control are then analysed in detail, and a new control method combined PFM with PS is proposed. Compared with single PFM control, pulse frequency modulation-phase shift (PFM-PS) control realizes wide voltage gain and full-range soft switching, thereby improving converter efficiency. Finally, feasibility and superiority of PFM-PS control are verified by PSIM simulation and the prototype experiment.

Key words： LLC resonant converter bidirectional pulse-frequency-modulation control phase- shift control soft switching

Received: 31 August 2017 Published: 29 December 2018

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TM46

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	Tao Wendong
	Wang Yubin
	Zhang Fengyi
	Qu Zengbin
	Pan Tengteng

Cite this article:

Tao Wendong,Wang Yubin,Zhang Fengyi等. Pulse Frequency Modulation and Phase Shift Combined Control Method for Bidirectional LLC Resonant Converter[J]. Transactions of China Electrotechnical Society, 2018, 33(24): 5856-5863.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.180631 OR https://dgjsxb.ces-transaction.com/EN/Y2018/V33/I24/5856

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