高频变压器一次侧串联LLC+输出端并联Buck级联直流变换器

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Abstract In this paper, a two-stage DC-DC topology, which consists of primary series transformer LLC and output interleaved Buck, is presented. The proposed topology can be applied in DC power converters of high/wide input voltage, low output-voltage/high output-current and high power density. This cascaded topology makes full use of the high efficiency of the open-loop operating LLC converter with constant switching frequency. Moreover, the electrical isolation and voltage step-down are also realized by the LLC. The output voltage regulation as well as the automatic current sharing is achieved by the second stage interleaved Buck. The operation mode of the cascaded converter and the parameter of the LLC are designed, and the steady-state output current sharing is analyzed even with mismatched parameter. Finally, the theoretical analysis is validated by simulation and experiments.

Key words： LLC Buck automatic sharing of currents series/parallel transformer cascaded converter

Received: 28 May 2014 Published: 30 December 2015

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TM46

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	Articles by authors
	Shi Jianjiang
	Zhang Jiangming
	Long Jiangtao
	Liu Tianji

Cite this article:

Shi Jianjiang,Zhang Jiangming,Long Jiangtao等. A Cascaded DC Converter with Primary Series Transformer LLC and Output Interleaved Buck[J]. Transactions of China Electrotechnical Society, 2015, 30(24): 93-102.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2015/V30/I24/93

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