宽范围CLLLC双向同步整流数字控制方法

doi:10.19595/j.cnki.1000-6753.tces.210152

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Abstract In order to solve the problems of low efficiency and high temperature of the switches under a wide range of working conditions of the bidirectional CLLLC resonant converter, this paper proposes a digital synchronous rectification controller for the rectifier on the secondary side of the high frequency transformer. Based on the pulse frequency modulation (PFM) mode of the CLLLC circuit, the operating mode of different frequencies is analyzed, and the relationship between the driving signal of the synchronous switch and the driving signal of the active device on the primary side of the transformer is obtained. In a wide modulation frequency range, the delayed turn-on time and lead turn-off time of the driving signal for the synchronous devices is obtained respectively by calculation and piecewise linear function fitting methods. Compared with other synchronous rectification control, this method is realized by pure digital control, which can be applied to high-power applications with a wide range of bus voltage variation. Furthermore, this method is suitable for bidirectional converters. and avoids the shortcoming that the analog control chip is sensitive to bus voltage changes. Meanwhile, the proposed control method is simple to implement, and the cost and complexity of circuit can be reduced. Finally, a simulation platform and an experimental prototype were built to verify the proposed method. The results show that this strategy can increase the efficiency of the CLLLC system by about 3%, and can greatly reduce the temperature of the synchronous switches.

Key words： On board charger bidirectional CLLLC converter pulse frequency modulation (PFM) digital synchronous rectification multiple linear fitting

Received: 29 January 2021

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TM46

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	Articles by authors
	Liao Jiarui
	Hang Lijun
	Dan Zhimin
	He Yuanbin
	Gao Jinfeng

Cite this article:

Liao Jiarui,Hang Lijun,Dan Zhimin等. Digital Control Method of Wide-Range CLLLC Bidirectional Synchronous Rectification[J]. Transactions of China Electrotechnical Society, 2022, 37(14): 3632-3642.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.210152 OR https://dgjsxb.ces-transaction.com/EN/Y2022/V37/I14/3632

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