US 12,456,570 B2
Planar magnetic devices exhibiting enhanced thermal performance
Alan Joseph, Shelby Township, MI (US); and Joel Anderson, Ferndale, MI (US)
Assigned to Kostal of America, Inc., Troy, MI (US)
Filed by Kostal of America, Inc., Troy, MI (US)
Filed on Jul. 21, 2019, as Appl. No. 16/517,612.
Prior Publication US 2021/0020353 A1, Jan. 21, 2021
Int. Cl. H01F 27/28 (2006.01); H01F 41/04 (2006.01)
CPC H01F 27/2804 (2013.01) [H01F 41/041 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A planar magnetic device, comprising:
a first conductive layer, and a second conductive layer parallel with and separated from the first conductive layer by a layer of dielectric material, the first conductive layer patterned to define a first spiral conductive trace having more than a single turn or winding and to define a first spiral gap area between turns, the second conductive layer patterned to define a second spiral conductive trace having more than a single turn or winding and to define a second spiral gap area between turns, the geometric patterns of the first spiral conductive trace and the second spiral trace each having continuous curvature wherein one of the first spiral conductive trace and the second spiral conductive trace has a width that varies continuously along its length, and the other of the first spiral conductive trace and the second spiral conductive trace has a uniform width along its length, and wherein the first spiral conductive trace overlaps the entire second spiral gap area and the second spiral trace underlies the entire first spiral gap area.