一种高降压比DC-DC变换器

doi:10.19595/j.cnki.1000-6753.tces.L80485

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Abstract The traditional dual-switch forward converter is limited by the transformer ratio and the minimum duty cycle of the switch, which is impossible to apply on high step-down ratio situation. This paper proposes a non-isolated new high step-down ratio DC-DC converter on the basis of the above. The DC-DC converter removes the transformer and substitutes the rectifier diode for an inductor that acts as an energy feedback to achieve a high step-down ratio with the appropriate duty cycle. This paper analyzed the voltage reduction principle of the converter, concluded four operating states of the converter in the continuous mode of the filter inductor current, deduced the calculation formula of the output gain of the converter, and provided the limiting conditions of the current continuous mode. Compared with other two kinds of step-down circuits, the DC-DC converter showed its advantages. Finally, an experimental prototype was built to achieve a step-down ratio up to 50 times, which proved the correctness of theoretical analysis.

Key words： High step-down DC-DC dual-switch forward non-isolated

Received: 30 June 2018 Published: 30 October 2019

PACS:

TM464

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	Articles by authors
	Liu Changyong
	Zhao Jinbin
	Mao Ling
	Zhou Mingjie
	Li Yutong

Cite this article:

Liu Changyong,Zhao Jinbin,Mao Ling等. A High Step-Down DC-DC Converter[J]. Transactions of China Electrotechnical Society, 2019, 34(20): 4264-4271.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.L80485 OR https://dgjsxb.ces-transaction.com/EN/Y2019/V34/I20/4264

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