单周期控制Boost变换器Hopf分岔控制及电路实现

摘要

用平均模型分析了单周期控制Boost变换器的运行,分析表明在参考电压变化的情况下,单周期控制Boost变换器会出现Hopf分岔.Hopf分岔使得变换效率下降,器件应力增加.为了消除Hopf分岔,提出了采用washout滤波器的方法.建立了采用washout滤波器的单周期控制Boost变换器平均模型,对于washout滤波器中的两个新参数,可以用Routh-Hurwitz准则来确定.仿真和电路实验验证了所提方法的效果.%The one-cycle controlled Boost converter is analyzed by using its averaged model.The results show that the one-cycle controlled Boost converter loses stability via a supercritical Hopf bifurcation,which may jeopardize the performance of the converter.A washout filter is proposed in this paper to suppress the Hopf bifurcation.This method can be easily implemented due to the structure of the one-cycle controlled Boost converter.The averaged model of the washout filter-aided one cycle controlled Boost converter is derived.Two new parameters in the washout filter can be chosen by Routh-Hurwitz stability criterion.The washout filter-aided method is verified by simulation and experiment.