带CLC滤波的双管反激四阶小信号模型

Fourth Order Small Signal Mathematic Model of Two-switch Flyback Converter with CLC Output Filter

普通双管反激变换器的输出端只有一级电容滤波,存在着电流纹波大、稳定性差、精度低等缺点。为克服上述缺点,在这种变换器的输出端增加了一级电感-电容(LC)滤波器,构成了输出端带有电容-电感-电容(CLC)滤波的新型变换器,并应用状态空间平均法确定了电路的静态工作点,推导出该变换器的动态四阶小信号模型。应用该模型设计了一个实际变换器,并通过分析该变换器的波特图给出系统补偿网络参数,利用MATLAB仿真以及实验验证了该四阶小信号模型的正确性。

Conventional two-switch flyback converter only has one capacitor filter,has bigger current ripple,poor stability,low accuracy shortcomings.In order to overcome the defects,output was increased a inductor-capacitor （LC） filter part,a new-style two-switch flyback converter with capacitor-inductor-capacitor （CLC） output filter was made up,and the circuit static working point was determined through the application of state space average method,the dynamic frequency small signal model of the converter was derivated,the system compensation part and parameter was designed at the base of the analysis of characteristics of Bote diagram and verified the correctness of the model of small signal through MATLAB analysis and experiments.