Magnetic device

Inductor devices – Coil or coil turn supports or spacers – Printed circuit-type coil

Reexamination Certificate

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C336S223000, C336S232000

Reexamination Certificate

active

07468648

ABSTRACT:
A magnetic device to be surface mounted on a substantially planar thermally conductive surface comprises a circuit board containing a winding pattern having at least one winding and a magnetic core that is at least partially encompassing the winding pattern. On a bottom side of the circuit board a region corresponding to a substantial part of the winding pattern is covered by a thermally conductive material for thermally contacting the thermally conductive surface. A transformer arrangement comprises such a magnetic device as well as a thermally clad circuit board having a surface area covered by a thermally conductive material, corresponding to at least substantially the covered region on the bottom side of the circuit board. For assembly, the covered region on the bottom side of the circuit board is soldered to the covered region on the surface of the thermally clad circuit board. The extensive cover and thermal contact to the thermally conductive surface allows for heat transfer from the complete winding area, reducing the total thermal resistance and temperature gradients in the winding structure. The solution is inexpensive and easy to manufacture.

REFERENCES:
patent: 5949191 (1999-09-01), Cassese et al.
patent: 6069548 (2000-05-01), Baarman et al.
patent: 6073339 (2000-06-01), Levin
patent: 6239683 (2001-05-01), Roessler et al.
patent: 6466454 (2002-10-01), Jitaru
patent: 7068133 (2006-06-01), Ries
patent: 0 507 360 (1996-05-01), None
patent: 2 317 751 (1998-04-01), None
patent: WO 2004/040599 (2004-05-01), None

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