恒定导通时间电容电流控制Buck变换器研究

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Abstract For the constant on-time V² (V²-COT) controlled buck converter,when the output capacitor with small equivalent series resistance (ESR) is used,it will operate in the unstable state because the output voltage phase lags behind the inductor current phase.To solve the problem,a constant on-time capacitor current (CC-COT) control technique for switching converter is proposed and its operational principle is elaborated.Based on the small signal model established by describing function method,the stability of CC-COT controlled buck converter is studied by using the Routh-Hurwitz criterion.The study results show that the CC-COT control technique has fast transient response characteristic and can eliminate the instability caused by the small ESR of the output capacitor.

Key words： Capacitor current constant on-time V² (V²-COT) control equivalent series resistance (ESR) stability transient response

Received: 05 January 2015 Published: 18 December 2015

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TM315

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	Articles by authors
	Zhang Xi
	Sha Jin
	Xu Yangjun
	Xu Jianping
	Chen Xing

Cite this article:

Zhang Xi,Sha Jin,Xu Yangjun等. Research on the Constant On-time Capacitor Current Control of Buck Converters[J]. Transactions of China Electrotechnical Society, 2015, 30(23): 18-23.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2015/V30/I23/18

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