双频Buck变换器的非线性现象仿真研究  

Simulation Study on Nonlinear Phenomena in Double-Frequency Buck Converter

作　　者：黎志铭[1] 周雒维[1] 卢伟国[1] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400044

出　　处：《系统仿真学报》2010年第4期1022-1026,共5页Journal of System Simulation

基　　金：国家自然科学基金(50807058;50677071);高等学校博士点专项科研基金(200611012)

摘　　要：根据高、低频单元动力学行为特点,把双频Buck变换器系统的快标不稳定性分析问题解耦为两个单频Buck系统的快标不稳定性分析问题,提出了一类改进的数据采样建模方法,构建了高频部分的频闪映射模型。基于该模型使用一种非数值方法求解出不动点处的雅可比矩阵并讨论了电路参数变化对系统稳定性的影响。此外,揭示了低频网络部分存在的非线性现象,给出了低频网络稳定运行的必要条件。数值仿真结果证实理论分析中的结论,有效地阐释了双频Buck变换器系统的快标不稳定性现象,为其稳定、优化运行提供了理论依据。Based on the dynamics characteristics of the high-and low-frequency Buck cells in the double-frequency Buck converter （DFBC）,the fast-scale instabilities analysis of the DFBC system was decoupled to that of two single-frequency Buck converter systems. An improved sampled-data modeling method was put forward to build the stroboscopic map model of the high-frequency buck converter system. With the obtained model,the system Jacobian matrix was developed by a nonnumeric method and hence the effects of the circuit parameters on the system stabilities were discussed. Furthermore,the nonlinear phenomena existed in the low-frequency Buck cell were revealed and the necessary condition for its stable operation was proposed as well. Finally,the theoretical analysis was verified by the numerical simulation,the research of this work explains effectively the fast-scale instabilities of the DFBC system and provides some theoretical rules for its stable and optimum operation.

关 键 词：分岔与混沌 双频 BUCK变换器 快标不稳定性 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]