恒定导通时间双频率控制开关变换器

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Abstract A novel control technique, constant on-time bi-frequency (COT-BF) control technique, for switching converters is proposed and investigated in this paper. The proposed COT-BF control technique regulates output voltage of switching converters by two preset control pulses with constant on-time but different switching frequencies. The COT-BF controller is easy to be realized without error amplifier and its corresponding compensation network. The principle and control strategy of COT-BF are analyzed with a Buck converter operating in discontinuous conduction mode (DCM) as an example. Experimental results show that COT-BF controlled DCM Buck converter has much faster transient response and lower EMI than that with conventional voltage-mode pulse width modulation (PWM) technique.

Key words： Constant on time bi-frequency (COT-BF) control pulse width modulation (PWM) transient response EMI

Received: 26 January 2010 Published: 07 March 2014

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TM46

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	Wang Jinping
	Xu Jianping
	Lan Yanni

Cite this article:

Wang Jinping,Xu Jianping,Lan Yanni. Study of Constant On-Time Bi-Frequency Control Technique for Switching Converters[J]. Transactions of China Electrotechnical Society, 2011, 26(11): 1-7.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2011/V26/I11/1

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