Core Losses of Nanocrystalline Materials Under DC Bias Conditions

Numerous power electronics topologies rely on magnetic components operating with a DC bias flux, resulting in higher core losses. The losses of nanocrystalline gapped cores as a function of the DC flux density, up to 0.95 T, are reported in this paper for various AC flux density ripple, up to 300 mT peak-to- peak. An unprecedented relative loss level increase has been measured under large DC bias, and the phenomenon has been observed to be more pronounced at lower AC flux density ripple.