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开关电源系统分析的主要困难是脉宽调制系统非线性数学模型的建立.目前流行的分析方法是状态空间平均值法,它主要适用于小信号扰动.在低频小信号扰动条件下,使用这种方法可以方便地把一脉宽调制系统简化成一线性系统.当功率级小信号状态空间模型电路建立后,便可直接使用线性反馈控制原理来分析和设计这个系统.本文主要阐述如何利用计算机辅助设计和分析技术,分析和计算开关电源的稳定性,校正电路参数的选择、动态过程的计算和分析.
The main difficulty of switching power supply system analysis is the establishment of nonlinear mathematical model of pulse-width modulation (PWM) system.At present, the popular analytical method is the state-space averaging method, which is mainly suitable for small signal perturbation.Using this low-frequency small signal disturbance The method can be easily used to simplify a pulse width modulation system into a linear system.When the power level small signal state space model circuit is established, the linear feedback control principle can be directly used to analyze and design this system.This paper mainly describes how to use computer aided design And analysis techniques to analyze and calculate the stability of the switching power supply, the choice of correction circuit parameters, the calculation and analysis of dynamic processes.