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ElectroComponent Science and Technology
Volume 5, Issue 4, Pages 219-222

The Frequency Dependence of Resistance in Foil-Wound Inductors

Department of Electronic and Electrical Engineering, Loughborough University of Technology, Leicestershire, UK

Received 1 June 1978; Accepted 1 August 1978

Copyright © 1979 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Foil wound air-cored inductors are widely used in power electronics applications, and often exhibit power dissipation much greater than can be accounted for by the d.c. resistance. This is shown to be due to non-uniform current flow. A scaling rule, relating the effects to turns and frequency, is demonstrated. The general principle of equal current sharing can be satisfied in a toroidal system.