电源反馈设计速成篇之二仿真篇 (Voltage mode, CCM)

电源反馈设计速成篇之二:仿真篇(Voltagemode,CCM)图1为Pspice电路,开关平均模型是关键.画好后先仿真直流工作点,因为二极管压降,输出电压低于15V.但交流仿真不变如图2所示.为了和表达式结果对比,将仿真结果读入Mathcad,比较结果如图3所示.红色为表达式计算结果,蓝色为Pspice仿真结果,一致性很好.图1.图2.101001.1031.1041.1051.1061.107806040200204060LoopGain(Magnitude)gainGvd2iπ⋅fn⋅()()mag1〈〉fnmag0〈〉,101001.1031.1041.1051.1061.1071801501209060300306090LoopGain(Phase)phaseGvd2iπ⋅fn⋅()()ph1〈〉fnph0〈〉,图3.