电动汽车直流充电系统LLC谐振变换器软开关电压边界分析

doi:10.19595/j.cnki.1000-6753.tces.211292

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Abstract LLC resonant converter has been widely used in the field of DC charging for electric vehicles due to its excellent performance. Aiming at the charging requirements of electric vehicles with wide output voltage range and high efficiency, the output voltage boundary of the full bridge LLC resonant converter in DC charging module was analyzed in this paper. At the upper boundary of (zero voltage switching, ZVS), the magnetizing inductance of the transformer resonates, whose equivalent peak voltage of the secondary side is equal to the load voltage, and the rectifier diode conducts critically. And at the lower boundary of ZVS, the resonant current and the input voltage of the resonator cross zero at the same time, and the converter runs in the critical inductive region. In this paper, the working state at the ZVS upper and lower boundaries of the converter was analyzed in detail by the time-domain analysis method. The output voltage range of the converter operated in the soft switching state was calculated, and the relationship between the soft switching characteristics of the converter and the working frequency and resonance parameters was revealed, which could provide guidance for parameter design and frequency conversion control of the converter. Finally, the analytical method was verified by simulation and experiment platform.

Key words： LLC resonant converter soft switch operation output voltage boundary zero voltage switching (ZVS) electric vehicles

Received: 15 August 2021

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TM46

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	Ding Chao
	Li Yong
	Jiang Li
	Wan Jianghu
	Liu Fang

Cite this article:

Ding Chao,Li Yong,Jiang Li等. Analysis of Soft Switching Voltage Boundary of LLC Resonant Converter for EV DC Charging System[J]. Transactions of China Electrotechnical Society, 2022, 37(1): 3-11.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.211292 OR https://dgjsxb.ces-transaction.com/EN/Y2022/V37/I1/3

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