Patent ID: 8610533

Claim:
A power conversion device comprising: a magnetic core; and a plurality of windings surrounding portions of the magnetic core, including a first winding and a second winding magnetically coupled through the magnetic core; wherein the magnetic core comprises a first part formed of a first material in direct contact with a second part formed of a second material, the first material having a first stiffness and the second material having a second stiffness substantially less than the first stiffness; and wherein the first winding and the second winding are magnetically coupled through the first part of the magnetic core; and wherein the second part of the magnetic core at least partially fills the space in between winding material of the first winding and winding material of the second winding; and wherein the first winding is disposed on a first substrate and the second winding is disposed on a second substrate, the magnetic core passing through openings in the first substrate and the second substrate; and wherein the second part of the magnetic core is configured to surround a column of the first part of the magnetic core.