Open AccessElectromagnetic interference of switching mode power regulator with chaotic frequency modulation
Author(s) -
Hung Wong,
Y. C. Chan,
M A Sui Wah
Publication year - 2002
Publication title -
facta universitatis. series electronics and energetics/facta universitatis. series: electronics and energetics
Language(s) - English
Resource type - Journals
eISSN - 2217-5997
pISSN - 0353-3670
DOI - 10.2298/fuee0201111w
Subject(s) - electromagnetic interference , emi , noise (video) , physics , harmonics , pulse width modulation , acoustics , modulation (music) , frequency modulation , interference (communication) , common mode signal , electronic engineering , chaotic , signal (programming language) , electrical engineering , power (physics) , computer science , engineering , radio frequency , voltage , analog signal , channel (broadcasting) , quantum mechanics , artificial intelligence , digital signal processing , image (mathematics) , programming language
In this work, we propose an improved switching scheme (called chaotic frequency modulation (CFM)) for switched-mode power supplies to suppress the electromagnetic interference (EMI) noise source. The basic principle of CFM is to use a chaotic signal to modulate the switching signal so that the harmonics of noise power is distributed evenly over the whole spectrum instead of concentrated at the switching frequency. When compared with the conventional pulse width modulation (PWM) scheme, significant improvements in both conducted and radiated EMI noise levels were found with the proposed CFM method. For conducted EMI, the peak noise level was reduced by 25 dB_V. For radiated EMI, we found that the noise was found mainly in the frequency range of 30 MHz to 230 MHz and the CFM scheme would help to reduce the peak noise level in this frequency range by 22 dB_V.