电流模式BOOST变换器倍周期分岔现象研究

摘要

The nonlinear behavior of the current-mode Boost converter is analyzed by the time domain waveform,phase portrait,sampling diagram and bifurcation diagram.The bifurcation diagram is drawn by Matlab using the simulated data,and all the evolution process of dynamical behavior in converter with the parameter changed can be shown.The sampling holder is used to control the bifurcation parameter and sample the inductor current in the experiment.The period doubling bifurcation is observed in the circuit.Experimental results coincide with the simulation results,which confirmed the rationality and the operability of analytical method and experimental method used in this paper.%本文运用时域波形、相轨图、采样图及分岔图等方法对电流模式控制Boost变换器中的非线性行为进行分析.提出一种仿真数据与Matlab相结合的方法来绘制表征电路系统非线性动力学特性的分岔图,对变换器在参数变化过程中各种动力学行为的演化过程进行辨析.实验中,通过搭建外围采样保持电路来实现分岔参数控制和电感电流采样,观察到电路系统的倍周期分岔现象,实验结果与仿真结果一致,证实了所采用分析方法与实验方法的合理性和可操作性.