Analysis and spectral characteristics of a spread-spectrum technique for conducted EMI suppression

Frequency modulation (FM) and random switching methods have been used for reducing conducted electromagnetic interference (EMI) in power converters. Limited theoretical studies and comparisons of these schemes, however, are available. In this paper, a detailed analysis and the spectral characteristi...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2000-03, Vol.15 (2), p.399-410
Main Authors: Tse, K.K., Chung, H.S.-H., Huo, S.Y., So, H.C.
Format: Article
Language:English
Subjects:
Capacitors
Circuits
Electrical engineering
Electromagnetic compatibility
Electromagnetic interference
Frequency modulation
Modulation
Power harmonic filters
Power system harmonics
Pulse duration modulation
Pulse width modulation
Pulse width modulation converters
Retarding
Spectra
Spectral analysis
Spread spectrum communication
Switched-mode power supply
Switching
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Summary:Frequency modulation (FM) and random switching methods have been used for reducing conducted electromagnetic interference (EMI) in power converters. Limited theoretical studies and comparisons of these schemes, however, are available. In this paper, a detailed analysis and the spectral characteristics of a random carrier-frequency (RCF) technique for suppressing conducted EMI in an offline switched-mode power supply are presented. The analysis provides a theoretical platform for studying the characteristics of this random switching scheme. The level of randomness is defined for the RCF scheme and varied in the converter example so that the effects on the power spectra can be demonstrated. Theoretical predictions of the spectral characteristics of this scheme are confirmed with measurements. The RCF scheme has been compared with the standard constant-frequency pulsewidth modulation (PWM) scheme and the FM scheme. Comparisons of their spectral performance show that the RCF scheme has better conducted EMI suppression than the FM and standard PWM schemes.
ISSN:0885-8993
1941-0107
DOI:10.1109/63.838113