Patent ID: 9041500
Filing Date: 2015-05-26
Classification: H01F

Abstract:
1. A magnetic core, comprising: a first core having a predetermined magnetic permeability, the first core having legs; a second core of the same material as the first core, the second core providing a closed magnetic circuit together with the first core; and a third core arranged between the first core and the second core, the third core having a lower magnetic permeability than the first core, wherein the first core, the second core and the third core are stacked in a stacking direction, and the second and third cores protrude outwardly beyond the legs of the first core in a direction perpendicular to the stacking direction, the second core is configured to radiate heat through a heat radiator such that the second core contacts the heat radiator, at least one of the first core and the second core being configured to be wound with a coil, the first core has a plurality of magnetic path forming portions, each of the magnetic path forming portions forms a magnetic path in which magnetic flux flows toward or away from the second core, the second core is a single flat plate-like shape and is fixed to the heat radiator, and only the second core contacts the heat radiator, the third core is a single flat plate-like member that contacts all the magnetic path forming portions, the first core, the third core, the second core, and the heat radiator are arranged sequentially in this order and held in tight contact, the second core and the third core contact each other along a single planar surface, and the third core is arranged between all the magnetic path forming portions and the second core.