An aluminium busbar in a power converter carries a switching-ripple current

PHYSICS · Multi-part · Fermi University Physics · Electricity, Magnetism & Electromagnetism · Electromagnetic induction and alternating-current circuits · Electromagnetic induction and alternating-current circuits

The Boundary-Value Problem, Ch The quasi-static approximation, eddy currents and the skin effect

Problem

An aluminium busbar in a power converter carries a

f = 10\,\mathrm{kHz}

switching-ripple current. Aluminium has

\sigma = 3.50\times10^7\,\mathrm{S\,m^{-1}}

\mu_r = 1

and

\varepsilon_r \approx 1

. ((a)) Evaluate

\Lambda = \varepsilon_0\omega/\sigma

and state whether the displacement current may be dropped. ((b)) Calculate the skin depth of the aluminium at this frequency.

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