US Patent 8035471 Power inductor with reduced DC current saturation

A power inductor comprises a magnetic core material having first and second ends. An inner cavity arranged in said magnetic core material extends from the first end to the second end. A conductor passes through the cavity. A slotted air gap is arranged in the magnetic core material and extends from the first end to the second end. An eddy current reducing material is arranged in the cavity. The eddy current reducing material has a permeability that is lower than said magnetic core material.