Patent ID: 8237534

Claim:
An apparatus comprising: a primary winding; a secondary winding, wherein one of said primary and secondary windings comprises a first component coil, said first component coil comprising: a power pad at each end thereof; a first substrate having a first substantially planar insulating layer of material having first top and first bottom surfaces; a first trace on said first top surface, said first trace having a first outer end and a first inner end, a first spiral conductor being connected between said first outer and inner ends; a second trace on said first bottom surface, said second trace having a second outer end and a second inner end, a second spiral conductor being connected between said second outer and inner ends; and: a conductor connecting said first inner end of said first trace to said second inner end of said second trace; and an insulator separating said primary and secondary windings, said primary and secondary windings being aligned such that a portion of the magnetic field generated by said first component coil passes through the other of said primary and secondary windings when a potential difference is applied between said power pads of said first component coil.