Patent ID: 8907759

Claim:
A magnetic core, comprising: a first core; and a second core formed of a material having a lower magnetic permeability and a higher saturation magnetic flux density than those of the first core, the second core forming a closed magnetic path together with the first core, wherein the second core includes a first core member having a plurality of magnetic legs that extend toward the first core and form a potion of the closed magnetic path, and at least one second core member formed by a component independent from the first core member, each second core member has a distal surface held in contact with the first core, an area of the distal surface between each second core member and the first core is larger than the smallest cross-sectional area of the second core in a direction perpendicular to a flow direction of a magnetic flux in the closed magnetic path, each second core member is arranged between the first core and at least one of the magnetic legs and held in contact with the at least one of the magnetic legs, and the area of the distal surface between each second core member and the first core is larger than a contact area between a corresponding one of the magnetic legs and the second core member.