DocumentCode :
1262239
Title :
RF equivalent circuit modeling of ferrite-core inductors and characterization of core materials
Author :
Yu, Qin ; Holmes, Thomas W. ; Naishadham, Krishna
Author_Institution :
ITT Automotive Inc., Dayton, OH, USA
Volume :
44
Issue :
1
fYear :
2002
fDate :
2/1/2002 12:00:00 AM
Firstpage :
258
Lastpage :
262
Abstract :
Ferrite-core inductors play an important role in electromagnetic noise suppression. The radio-frequency (RF) equivalent circuit modeling of the inductor is very useful for characterizing the inductor and for noise filtering studies. A technique is proposed for extracting the equivalent circuit parameters of the inductor and determining the frequency-dependent effective rod permeability as well as the intrinsic permeability of the ferrite-core material. The equivalent series resistance, inductance, and the lumped shunt parasitic capacitance have been calculated versus frequency for a slug-type inductor and a toroidal-type inductor. The effective rod permeability of the ferrite rod used in the slug-type inductor and the intrinsic permeability of the ferrite core used in the toroidal-type inductor have also been estimated as a function of frequency. The calculated intrinsic permeability of the toroidal core agrees very well with that measured by the HP4291A RF Material Analyzer. The proposed method is simple and accurate. In addition, it provides an alternative way for characterizing ferrite cores at radio frequencies
Keywords :
capacitance; electric resistance; equivalent circuits; ferrite filters; ferrites; inductors; interference suppression; passive filters; permeability; radiofrequency interference; EMI suppression; HP4291A RF Material Analyzer; RF equivalent circuit modeling; chokes; core materials characterization; effective rod permeability; electromagnetic interference; electromagnetic noise suppression; equivalent circuit parameters; equivalent series resistance; ferrite rod; ferrite-core inductors; ferrite-core material; filtering circuits; frequency; frequency-dependent effective rod permeability; inductance; lumped shunt parasitic capacitance; noise filtering; noise suppression; radio-frequency equivalent circuit modeling; slug-type inductor; toroidal-type inductor; Circuit noise; Electromagnetic induction; Electromagnetic interference; Equivalent circuits; Ferrites; Filtering; Frequency estimation; Inductors; Permeability; Radio frequency;
fLanguage :
English
Journal_Title :
Electromagnetic Compatibility, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9375
Type :
jour
DOI :
10.1109/15.990733
Filename :
990733
Link To Document :
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