电压模式BUCK变换器输出延迟反馈混沌控制

Output time-delay feedback control of chaos in voltage-mode BUCK converter

将输出时间延迟反馈控制(TDFC)引入到电压模式BUCK变换器控制中,实现了对原系统的混沌控制.利用谐波平衡法,基于频域量化分析,确定出延迟时间和反馈增益的调节范围.同时在延迟时间比开关周期小得多的情况下,将TDFC等效为一类简单的无源反馈控制,二者仿真控制结果基本一致.最后搭建该无源反馈控制电压模式BUCK变换器实验电路,验证了所提控制方式可以快速实现系统混沌态到单周期态的过渡,而且电压和电流纹波得到减小.

To realize the control of chaos in the voltage-mode BUCK converter, the output time-delayed feedback control （TDFC） is introduced into its control prototype. Based on the quantified analyses in the frequency domain, harmonic balance method is used to ascertain the regulating range of feedback control gain and delay time. Meanwhile the TDFC is equivalent to a kind of simple passive feedback control when the delay time is much smaller than the switch period. And the simulation results of these two methods are considered the same. In the end the experimental circuit of the voltage-mode BUCK converter with passive feedback control is set up. By this means the chaos state of BUCK converter can be quickly controlled into period state and the ripple of voltage and current will be decreased.