DocumentCode :
1186083
Title :
EMI reduction in switched power converters using frequency Modulation techniques
Author :
Balcells, Josep ; Santolaria, Alfonso ; Orlandi, Antonio ; González, David ; Gago, Javier
Author_Institution :
Electron. Eng. Dept., Univ. Politecnica de Catalunya, Barcelona, Spain
Volume :
47
Issue :
3
fYear :
2005
Firstpage :
569
Lastpage :
576
Abstract :
Frequency-modulation techniques have been used to reduce electromagnetic interference (EMI) produced by the clock of digital systems working in the range of hundreds of megahertz. The working principle consists of modulating the original constant clock frequency in order to spread the energy of each single harmonic into a certain frequency band, thus reducing the peak amplitude of EMI at harmonic frequencies. Nowadays, the switching frequency of power converters has increased up to values that make interesting the application of such techniques to reduce EMI emissions due to switching of power circuits. This paper presents the theoretical principles of frequency modulation using deterministic profiles for the modulating function. It shows the effectiveness of such methods in terms of EMI reduction for different modulation profiles and other parameters. The method is compared with other methods using random modulation. Tests carried out on a buck converter are presented for experimental validation of the method. A short discussion on optimal modulation profiles and parameters is also included.
Keywords :
electromagnetic interference; frequency modulation; interference suppression; switched mode power supplies; switching convertors; EMI reduction; buck converters; digital system clocks; electromagnetic interference; frequency modulation techniques; harmonic frequency; optimal modulation profiles; random modulation; switched power converters; Amplitude modulation; Buck converters; Circuit testing; Clocks; Digital systems; Electromagnetic interference; Frequency modulation; Switching circuits; Switching converters; Switching frequency; Electromagnetic interferences (EMI); power converters; spread spectrum frequency modulation (SSFM); switching frequency modulation;
fLanguage :
English
Journal_Title :
Electromagnetic Compatibility, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9375
Type :
jour
DOI :
10.1109/TEMC.2005.851733
Filename :
1516228
Link To Document :
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