用符号法分析PWM开关功率变换器闭环系统的稳态  

Steady-State Analysis of Closed-Loop PWM Switching Power Converter Systems Using Symbolic Method

作　　者：陈艳峰[1] 丘水生[1] 

机构地区：[1]华南理工大学电子与通信工程系,广州510640

出　　处：《电子学报》2000年第7期130-134,共5页Acta Electronica Sinica

基　　金：广东省自然科学基金!(No.940 0 89);国家教委高校博士点专项基金!(No.94561 0 2 )

摘　　要：本文将等效小参量法推广到PWM开关功率变换器闭环系统的稳态分析中 ,着重阐述了其基本原理及求解过程 .该方法可获得闭环系统稳态直流解、占空比及输出纹波解析解的符号表达式 ,并能直接说明纹波对占空比的影响及其同开关频率的关系 .文中实例表明 ,此方法计算过程简单 ,准确性较高 。An extension of Equivalent Small Parameter(ESP) method to analysis of PWM feedba ck controlled power converter systems,together with its basic principle and deri vation of solutions,is presented in detail.The symbolic expressions of steady-s tate DC outputs,duty cycle and output ripples are given,which can be used to exp lain the relationships among duty cycle,ripples and switching frequency.It is co nfirmed by the examples that the proposed method offers the advantages of both s implicity and accuracy.

关 键 词：开关功率变换器 闭环系统 符号分析 脉宽调制 

分 类 号：TN711.4[电子电信—电路与系统]