一种新的准固定频率滞环PWM电流控制方法  

A Novel Quasi-Constant Hysteretic PWM Current Mode Control Approach

作　　者：杨旭[1] 王兆安[1] 

机构地区：[1]西安交通大学电气工程学院,710049

出　　处：《电工技术学报》2003年第3期24-28,52,共6页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目 (5 0 0 0 70 0 7)

摘　　要：提出了一种新的准固定频率滞环PWM电流控制方法 ,该方法在滞环电流控制的基础上 ,引入频率反馈控制 ,使开关频率基本固定 ,解决了目前广泛使用的固定频率电流控制方法具有的次谐波振荡的问题 ,并且具有稳定性好、响应速度快、控制精度高的优点。对现有的固定频率电流模式控制方法和所提出的准固定频率PWM电流控制方法的原理和闭环响应进行了分析 ,并通过实验证实了分析的正确性。A novel quasi-constant frequency hysteretic PWM control approach is presented in this paper.A frequency feedback is introduced into the normal hysteretic current control to stabilize the switching frequency.Comparing with the common used constant frequency current mode control,the new approach has better stability,much faster transient and higher precision,as well as elimination of sub-harmonic oscillation.The design of the filtering circuit becomes much easier compared with the normal hysteretic current control because of the stabilized switching frequency.The principle and current loop dynamic response are analyzed for both constant frequency current mode control and newly presented quasi-constant frequency hysteretic PWM control,experiments have been carried out to proof the analysis.

关 键 词：滞环 电流模式控制 

分 类 号：TM761[电气工程—电力系统及自动化]