并联降压变换器的非线性行为分析与控制

以主从控制的并联降压型变换器为研究对象,通过实验得到间歇混沌等非线性行为,并通过特征值分析法进行验证,揭示了开关变换器工作中不规则运动产生的原因,为电路设计提供理论依据;在此基础上,提出时间与参数映射的方法和混沌控制的解决方案——相移法。通过将系统的其中一个驱动控制信号发生相位移动或延迟,把系统的混沌运动状态转变为规则运动状态,从而实现了并联降压型变换器电路的混沌控制。相移前后功率谱的变化充分说明了相移法实现混沌控制的可行性和正确性。

Analysis and control of nonlinear behavior in parallel-connection buck converters

The bifurcation phenomena of a system of parallel-connected buck converters were described in this paper.The results provide useful information for the design of stable current sharing in a master-slave configuration.The computer simulations open out the reason of bifurcation and chaos by simple theoretical analysis.On basis of it,some chaos control method called phase-shift was putted forward,which were analyzed with the mapping method that would map the time variable to some other parameter.By contrasting the power spectrum before and after the control method of phase-shift is adopted,the control results are validated right and feasible.