Estimation of ripple and inductance roll off when using powdered iron core inductors
Gautham Ram Chandra Chandra-Mouli (TU Delft - DC systems, Energy conversion & Storage)
Jos H. Schijffelen (Power Research Electronics BV)
Pavol Bauer (TU Delft - DC systems, Energy conversion & Storage)
Miro Zeman (TU Delft - Electrical Sustainable Energy)
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Abstract
Magnetic cores like powdered iron cores have a variable permeability, which is dependent on the magnetic motive force of the inductor windings. When inductors are designed using such materials, the inductance varies as a function of the inductor current. This causes a non-linear current to flow through the inductor. In this paper, mathematical derivation of the inductancecurrent relationship is derived for such inductors. The model is applied for a KoolMmu(r) powdered iron core and the results are verified experimentally using an interleaved boost converter.