带CLC滤波的反激变换器小信号建模与控制研究

为满足大型激光陀螺仪(ring laser gyroscope, RLG)中激光器激励源输出高精度、高稳定度的要求，针对单端反激变换器输出性能较差的问题，本文在传统反激变换器的输出端增加电感、电容元件，构成了输出带电容-电感-电容(capacitor inductor capacitor, CLC)滤波的单端反激变换器。在此基础上，采用开关元件平均模型法确定该变换器的静态工作点，建立电流连续模式(continuous conduction mode, CCM)下的四阶小信号模型；推导出相关传递函数，并引入相位超前校正环节以提高系统的稳定性；借助MATLAB软件构建比例-积分-微分(proportion-integral-differential, PID)控制的系统模型，完成了对带CLC滤波的反激变换器的分析与验证。结果表明，利用小信号建模理论建立的变换器模型是合理的，对激光器激励源的优化设计有参考意义。

Research on small signal modeling and control of a flyback converter with CLC filter

For large ring laser gyroscope (RLG),lasers require more accurate and more stable excitation power supplies.Aiming at the poor output performance of single-ended flyback converter,a single-ended flyback converter with capacitor-inductor-capacitor (CLC) filter is designed by adding capacitors and inductor to the output end of the traditional flyback converter.On this basis,the static working point of the converter is determined by using the switch elements average model method,and the fourth-order small signal model operating in continuous conduction mode (CCM) is established.The correlation transfer function is derived and the phase leading correction is introduced into the system to improve its stability.The system model of proportion-integral-differential (PID) control is established via MATLAB,and the analysis and verification of flyback converter with CLC filter is completed.The results show that the model established by small signal modeling theory is reasonable and available,which is helpful for the design and optimization of laser excitation power supply.