调频准谐振变换器系统的非线性全阶建模及符号分析法

Full-Order Nonlinear Modeling and Symbolic Analysis of Frequency Modulation Quasi-Resonant Switching Converters

基于开关函数建立了准谐振变换器的全阶非线性电路模型 ,并用等效小参量法进行分析 ,可得到全符号表示的谐振元件和滤波元件状态变量的直流解和纹波解。文中分析方法表明 ,利用开关函数的非线性建模及等效小参量分析 ,可统一PWM类及谐振类变换器的分析。

By using introduced switching functions,a full order nonlinear circuit model of frequency modulation quasi resonant converter(FM QRC)is presented.Then with equivalent small parameter analysis method,symbolic solutions of its steady state variables can be obtained,including DC component and harmonic components.It is shown that through the nonlinear circuit model,the resonant type and the PWM type converters can be unified with the same analysis method.