Patent ID: 9251944
Filing Date: 2016-02-02
CPC Classification: H01F

Claim Text:
1. A variable coupled inductor, comprising: a first core having a top surface and a bottom surface, a first lateral surface and a second lateral surface opposite to the first lateral surface, wherein the first core comprises a first protrusion, a second protrusion, a third protrusion, a first conducting-wire groove and a second conducting-wire groove, each of which extending from the first lateral surface to the second lateral surface on the top surface, wherein the second protrusion is disposed between the first protrusion and the third protrusion, the first conducting-wire groove is located between the first protrusion and the second protrusion, and the second conducting-wire groove is located between the second protrusion and the third protrusion; a first conducting wire disposed in the first conducting-wire groove and a second conducting wire disposed in the second conducting-wire groove, wherein the first conducting wire and the second conducting wire are extended to wrap around the first core at two opposite sides of the second protrusion of the first core via the bottom surface; a second core disposed over the first core; and a magnetic structure disposed between the second protrusion and the second core, wherein the magnetic structure comprises a first portion and a second portion, wherein the first portion and the second portion are symmetric to each other with respect to the central line of the second protrusion, wherein the central line extends from a first middle point of a first edge of the second protrusion on the first lateral surface to a second middle point of a second edge of the second protrusion on the second lateral surface, wherein the magnetic structure has a first surface area A