Summary
International Symposium on Nonlinear Theory and Its Applications
2015
Session Number:A4L-E
Session:
Number:A4L-E-5
A Chaotic Modulation Interface Circuit for Suppressing EMI in Commercial Power Supplies
Junying Niu, Zhong Li, Yuhong Song, Gary G. Feng, Wolfgang A. Halang,
pp.309-312
Publication Date:2015/12/1
Online ISSN:2188-5079
Summary:
To reduce electromagnetic interference(EMI) in commercial switching mode power supplies(SMPS) by chaotic carrier-frequency modulation(CCFM) technique, an interface module based on Chua's circuit is designed to modulate the oscillator frequency of typical PWM IC. With the various component value in Chua's circuit, the switching period modulated by the module obeys different probability distributions. Further, by formulating the power spectral density(PSD) of the chaotic switching PWM sequence, it is found that the effectiveness on EMI reduction depends on the probability density function(PDF) and the randomness level of the switching period. Theoretical predictions are verified with simulations.