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.
王金平, 许建平, 兰燕妮. 恒定导通时间双频率控制开关变换器[J]. 电工技术学报, 2011, 26(11): 1-7.
Wang Jinping, Xu Jianping, Lan Yanni. Study of Constant On-Time Bi-Frequency Control Technique for Switching Converters. Transactions of China Electrotechnical Society, 2011, 26(11): 1-7.
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