考虑最大输出电压和效率的LLC谐振变流器的设计方法

doi:10.19595/j.cnki.1000-6753.tces.170513

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Abstract Based on energy conservation law, the efficiency at the resonant point of LLC resonant converter was calculated, and accordingly the resonant frequency and the magnetizing inductor were optimized. Then the effecting curves of the resonant inductor on the minimum switching frequency and the maximum output voltage were analyzed, and accordingly the resonant inductor was optimized. Simultaneously, to increase the design accuracy of resonant parameters, the leakage inductor of transformer was calculated based on energy method and considered in the design process of resonant inductor. To verify the proposed design method, a 3.3kW LLC resonant converter prototype applied for on-board charger was developed, where the output voltage ranged from 230V to 430V, the efficiency was higher than 95.9% in the full output voltage range, and the peak efficiency was higher than 97.5%. The experimental results verify that the proposed design method improves the efficiency of the converter in a wide output voltage range.

Key words： LLC resonant converter efficiency maximum output voltage resonant parameter on-board charger (OBC)

Received: 24 April 2017 Published: 31 January 2018

PACS:

TM46

Fund:国家重点研发计划重点专项资助项目（2016YFB0101901）

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	Xu Hengshan
	Yin Zhongdong
	Huang Yongzhang

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Xu Hengshan,Yin Zhongdong,Huang Yongzhang. Design Method of LLC Resonant Converter Considering Maximum Output Voltage and Efficiency[J]. Transactions of China Electrotechnical Society, 2018, 33(2): 331-341.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.170513 OR https://dgjsxb.ces-transaction.com/EN/Y2018/V33/I2/331

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