Electrical Circuit Modeling of Conductors with Skin Effect
D. W. Kerst and J. C. Sprott
University of Wisconsin, Madison,
(Received 19 February 1986; accepted for publication 28 March 1986)
The electrical impedance of a lossy conductor is a complicated function
of time (or frequency) because of the skin effect. By solving the diffusion
equation for magnetic fields in conductors of several prototypical shapes,
the impedance can be calculated as a function of time for a step function
of current. The solution suggests an electrical circuit representation
that allows calculation of time-dependent voltages and currents of arbitrary
waveforms. A technique using an operational amplifier to determine the
current in such a conductor by measuring some external voltage is described.
Useful analytical approximations to the results are derived.
Ref: D. W. Kerst and J. C. Sprott, J. Appl.
Phys. 60, 475-481 (1986)
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