Patent ID: 7378932
Filing Date: 2008-05-27
Classification: H01F

Abstract:
1. A transformer comprising a bobbin including a winding portion for supporting a coil of wire, the winding portion including: a horizontal substantially flat base portion; a horizontal substantially flat top portion; and a step portion, wherein the step portion is disposed on top of the horizontal substantially flat base portion, and the horizontal substantially flat top portion is disposed on top of the step portion substantially in parallel to the horizontal substantially flat base portion, wherein the top portion has a central recess, raised portions on its upper surface separated from each other, and a ridge on one side of its lower surface, wherein the central recess and the raised portions cooperate to accept a magnetic core, such that the core is substantially flush with the raised portions; wherein the base portion has a central recess, raised portions on its lower surface separated from each other, wherein the central recess and the raised portions cooperate to accept a magnetic core, such that the core is substantially flush with the raised portions.