Comparison of various methods for calculating the AC resistance of inductors

The paper reviews several expressions for high-frequency winding resistance of inductors proposed by several authors and compares the theoretical predictions calculated from these expressions with experimental results. It identifies the expressions that yield the most accurate prediction of the wind...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2002-05, Vol.38 (3), p.1512-1518
Main Authors: Reatti, A., Kazimierczuk, M.K.
Format: Article
Language:English
Subjects:
Applied sciences
Circuits
Conductors
Direct current
Electric resistance
Electronic equipment and fabrication. Passive components, printed wiring boards, connectics
Electronics
Exact sciences and technology
Frequency
Frequency ranges
Inductors
Inductors and coils
wiring
Magnetic fields
Magnetism
Mathematical models
Q factor
Quality factor
Resonant frequencies
Transformer cores
Winding
Windings
Wire
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Summary:The paper reviews several expressions for high-frequency winding resistance of inductors proposed by several authors and compares the theoretical predictions calculated from these expressions with experimental results. It identifies the expressions that yield the most accurate prediction of the winding high-frequency resistance. The comparison shows that the method proposed by Dowell (1966) accurately predicts the AC resistance if the winding contains less than three layers. The methods proposed by several other authors accurately predict the high-frequency resistance only in certain frequency ranges. In addition, these expressions yield inaccurate results for the inductor quality factor. One expression, however, accurately predicts both the high-frequency winding resistance and the quality factor of inductors over a wide frequency range from the DC to the first resonant frequency. The paper concludes with a simple and accurate circuit model describing the frequency behavior of inductors.
ISSN:0018-9464
1941-0069
DOI:10.1109/20.999124