Patent ID: 7271697

Claim:
A miniature transformer comprising: a support member having a toroidal-shaped cavity formed therein, a ferrite toroid embedded in said cavity such that said toroid is substantially contained within said cavity, a first and second printed circuit formed on respectively opposite sides of said support member, a first plurality of plated through holes in said support member around the outside perimeter of said cavity of said toroidal cavity, a second plurality of plated through holes in said support member around the inside perimeter of said cavity, said first printed circuit including connecting respective first and second plated through holes, said second printed circuit including connecting respective first and second plated through holes, a third plurality of plated through holes in the same holes as said first plurality of plated through holes, said first and third plurality of through holes being electrically insulated from each other by vacuum depositing a thin layer of parylene followed by treating the outside surface of the parylene coated holes with an adhesion promoter, a fourth plurality of plated through holes in the same holes as said second plurality of plated through holes, said second and fourth plated through holes being electrically insulated from each other by the vacuum deposited thin layer at parylene, third and fourth printed circuits formed in respective layers over the layers of said first and second printed circuits with an insulated layer therebetween, said third printed circuit including connecting respective third and fourth plated through holes, said fourth printed circuit including connecting respective third and fourth through holes, said plated through holes and printed circuit connections forming primary and secondary windings of said miniature transformer.