An active ripple filtering technique for improving common-mode inductor performance

Active ripple filtering is the replacement of large passive components in power filter circuits with smaller passive components and active control circuitry. This letter focuses on common-mode filters, where a large common-mode inductor (choke) is replaced by two smaller chokes and active op-amp con...

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Bibliographic Details
Published inIEEE power electronics letters Vol. 2; no. 2; pp. 45 - 50
Main Authors Cantillon-Murphy, P., Neugebauer, T.C., Brasca, C., Perreault, D.J.
Format Journal Article
LanguageEnglish
Published New York IEEE 01.06.2004
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Active control
Active filters
Active inductors
Attenuation
Chokes
Circuits
Electromagnetic interference
Filtering
Filtration
Frequency
Inductors
Operational amplifiers
Passive components
Passive filters
Power filters
Ripples
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Summary:Active ripple filtering is the replacement of large passive components in power filter circuits with smaller passive components and active control circuitry. This letter focuses on common-mode filters, where a large common-mode inductor (choke) is replaced by two smaller chokes and active op-amp control. The technique is appropriate when improved attenuation is required at relatively low frequencies and the high-frequency filtering requirements are easily met. Smaller chokes save significantly in material and winding costs. The technique is more advantageous if wire-wound chokes can be replaced by planar printed circuit board chokes. The use of the technique in an automotive electromagnetic interference (EMI) filter application is explored in detail.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:1540-7985
1558-3767
DOI:10.1109/LPEL.2004.831155