NDLI: Impact of a Frequency Modulated Pulsewidth Modulation (PWM) Switching Converter on the Input Power System Quality

Content Provider	IEEE Xplore Digital Library
Author	Mukherjee, R. Patra, A. Banerjee, S.
Copyright Year	1986
Abstract	In this paper, we show that a frequency modulated (FM) source of conducted emission has an adverse effect on a dc power system, although it is believed that frequency modulation of the interferer reduces such effects. Spread spectrum modulation is a commonly proposed technique of electromagnetic interference (EMI) reduction. It is often suggested that an FM pulsewidth modulation ramp be used in a voltage mode controlled dc-dc switching converter for reduction of conducted and radiated EMI. However, this paper shows that this technique is not as beneficial as is commonly perceived. The power quality standard MIL-STD 704, which is the origin of the EMI standard MIL-STD 461, puts restriction on several parameters other than the frequency spectrum of the disturbance, which is the only parameter that is specified in the EMI norms and tested in electromagnetic compatibility (EMC) tests. In this paper, we show that different interferers which are compatible to the same EMC limit, may affect the same power system differently. This difference is noticed if the other power quality parameters are considered. We have also mentioned that the actual benefit from spread spectrum modulation-based EMI reduction depends on the savings in printed circuit board (PCB) footprint area that we get by using a smaller filter. Through a numerical study, we have shown that such a method leads to only a negligible savings in PCB area in spite of significant EMI reduction. Moreover, this brings about a degraded performance on the other parameters that are not normally checked in EMI tests.
Sponsorship	IEEE Power Electronics Society
Starting Page	1450
Ending Page	1459
Page Count	10
File Size	673003
File Format	PDF
ISSN	08858993
Volume Number	25
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Pulse width modulation converters Pulse width modulation Frequency modulation Pulse power systems Frequency conversion Switching converters Electromagnetic interference Testing Electromagnetic compatibility Spread spectrum communication spread spectrum modulation Conducted emission dc–dc converter electromagnetic interference pulsewidth modulation (PWM)
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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Reduced Conductive EMI in Switched-Mode DC–DC Power Converters Without EMI Filters: PWM Versus Randomized PWM

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Impact of a Frequency Modulated Pulsewidth Modulation (PWM) Switching Converter on the Input Power System Quality

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