Iron Loss Analysis of Ferrite Cores

Iron loss measurement of ferrite cores up to MHz range is carried out. Taking the DC magnetic hysteresis, the eddy and displacement currents into account, the electromagnetic fields and iron losses in the cores are computed. As a result, increasing the exciting frequency, the computed iron loss becomes considerably smaller than the experimented one. In order to explain the deference between them, a new magnetic field component yielding a dynamic magnetic loss is assumed and added to the magnetic field of the DC magnetic hysteresis. This assumption is verified by evaluating the iron loss frequency characteristics for different size cores of the same ferrite material.