by K. K. Tse, Henry Shu-hung Chung, S. Y. (ron Hui, Senior Member, H. C. So
IEEE Transactions on Power Electronics
http://www.ee.cityu.edu.hk/~hcso/tpe_3_00.pdf
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Abstract:
Abstract—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 its 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. Index Terms—AC-DC power conversion, pulsewidth modulation, random switching technique, switching circuit. I.
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Shu-Hung Chung (S'92–M'95) received the B.Eng. degree (with first class honors) in electrical engineering and the Ph.D. degree from The Hong Kong
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received the China Light and Power Prize and was awarded the Scholarship and Fellowship of the Sir Edward Youde Memorial Fund, in 1991 and 1993, respectively. He is currently Chairman of the Council of the Sir Edward Youde Scholar's Association and IEEE s
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was a Lecturer in power electronics at the University of Nottingham, U.K. from 1987 to 1990
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M'95) was born in Hong Kong in 1968. He received the B.Eng. degree in electronic engineering from the City
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received First Prize in the 1998
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SM'94) was born in Hong Kong in 1961. He received the B.Sc. degree (with honors from the University of Birmingham
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Tse (S'95) received the B.Eng. degree in electrical engineering (with honors) from the Hong Kong Polytechnic University, Hong Kong
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he has been with the City University of Hong Kong, where he is currently an Associate Professor in the Department of Electronic Engineering. His research interests include time- and frequency-domain analysis of power electronic circuits, switched-capacito
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