Bi-Frequency PWM Technique for Switching DC-DC Converters

摘要：

To improve the electromagnetic interference (EMI) performance of PWM controlled switching dc-dc converters, bi-frequency pulse width modulation (BF-PWM) technique is presented in this paper. The principle of BF-PWM modulation is illustrated and the characteristics of BF-PWM controlled buck converter operating in discontinuous conduction mode (DCM) are studied. For BF-PWM technique, two high frequency switching control pulses with the same turn-on time but different frequencies are modulated by a low-frequency PWM signal. The spectrum of the switching signal is thus spread and the spectral power level is reduced. Experimental results show that BF-PWM controlled buck converter benefits better EMI performance compared with voltage-mode PWM controlled buck converter.

作者: Yanni Lan Jianping Xu Jinping Wang Yu Gao

作者单位: School of Electrical Engineering, Southwest Jiaotong University, Chengdu, 610031, China

会议类型: 国际会议

会议名称: 2010 International Conference on Communications,Circuits and Systems(2010年通信、电路与系统国际会议)

会议地点: 成都

会议语种:英文

页码: 572-575

在线出版日期: 2010-06-28（万方平台首次上网日期，不代表论文的发表时间）