Notch filter feedback controlled chaos in buck converter
Lu Wei-Guo(卢伟国)†, Zhou Luo-Wei(周雒维), and Luo Quan-Ming(罗全明)
Key Laboratory of High Voltage Engineering and Electrical New Technology of Ministry of Education, College of Electrical Engineering, Chongqing University, Chongqing 400044, China
Abstract A method of controlling chaos in the voltage-mode buck converter is presented by using an improved notch filter feedback control in this paper. The proposed control part comprises a notch filter and a low-pass filter. The discrepancy between the outputs of the two filters is introduced into the control prototype of the power converter. In this way, the system period-1 solution is kept unchanged. The harmonic balance method is applied to analysing the variation law of the system bifurcation point, and then the stable range of the feedback gain is ascertained. The results of simulation and experiment are also given finally.
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