Patent ID: 7772955

Claim:
A two phase coupled inductor for magnetically coupling first and second phases of a power converter, comprising: a magnetic core forming a passageway having depth and height, the depth being greater than the height; a first winding providing electrical interface for the first phase; and a second winding providing electrical interface for the second phase, the first and second windings being wound at least partially around a common leg of the magnetic core and through the passageway, the first and second windings extending through the magnetic core only via the passageway, the second winding being separated from the first winding by a linear separation distance throughout the passageway, the separation distance being along an axis perpendicular to an axis of the height of the passageway and perpendicular to an axis of the depth of the passageway, the separation distance being greater than the height of the passageway, and the depth and the height of the passageway defining a cross sectional area of the passageway, the cross sectional area of the passageway between the first and second windings being at least partially free from intervening magnetic structure.