CCM模式下非理想Buck变换器的建模与仿真  

Modeling and Simulation of Non-Ideal Buck Converters Operating in CCM

作　　者：宣传 徐慧芳[1] 解光军[1] 

机构地区：[1]合肥工业大学电子科学与应用物理学院,合肥230009

出　　处：《电子器件》2012年第1期70-74,共5页Chinese Journal of Electron Devices

基　　金：安徽省高等学校省级自然科学研究重点项目(KJ2011A213)

摘　　要：首先运用能量守恒原理将非理想型Buck变换器进行理想化转换;然后,就转换后的电路根据开关网络平均模型法建立平均变量模型,从而得到Buck变换器的大信号平均等效电路、直流等效电路和交流小信号等效电路,进而进行稳态和动态小信号特性分析;接着在此基础上,设计补偿网络,实现闭环控制;最后借助MATLAB软件进行仿真,与补偿前的仿真图形进行比较分析得出结论。Firstly, the energy conservation principle was used to translate the non-ideal type of Buck converter into an ideal one. Then, on the converted circuit the average variable model was established by using the average switching-network model, that results in the average large-signal Buck converter equivalent circuit. The DC equivalent circuit and AC small-signal equivalent circuits ware derived from this converter equivalent circuit and the steady state and dynamic characteristics were analysed. On this basis, the compensation network was designed to achieve the closed-loop control. Finally, based on MATLAB software the simulation analysis was made to compare the above compensation with the Bode plot, that the conclusion was got.

关 键 词：BUCK变换器 能量守恒 开关网络平均模型法 补偿网络 

分 类 号：TM930[电气工程—电力电子与电力传动]