Patent ID: 7741943

Claim:
A transformer comprising: a primary winding; a secondary winding; N component coils; wherein the N component coils are aligned such that a portion of a magnetic field generated by each component coil of the N component coils passes through at least one other component coil of the N component coils; wherein a first electrically insulating material separates each component coil of the N component coils; wherein the primary winding comprises odd numbered component coils of the N component coils; wherein the secondary winding comprise even numbered component coils of the N component coils; wherein the N component coils are vertically stacked starting with a number one component coil of the N component coils followed by sequently numbered component coils of the N component coils until the Nth component coil is stacked at a top of the N component coils; wherein the odd numbered component coils of the primary winding are connected by a first vertical conductor; wherein the even numbered component coils of the secondary winding are connected by a second vertical conductor; wherein each component coil of the N component coils comprises: a substrate comprising an second electrically insulting layer of material having top and bottom surfaces; the top surface comprising a first trace having an outer end and an inner end and a first spiral conductor connected between the outer and inner ends of the first trace and comprising a continuous and gradually widening linear conductor that forms a curve around a central region; and the bottom surface comprising a second trace having an outer end and an inner end and a second spiral conductor connected between the outer and inner ends of the second trace and comprising a continuous and gradually widening linear conductor that forms a curve around a central region, the central regions of the first and second spiral conductors overlying one another; a third vertical conductor connecting the inner ends of the first and second traces; a first contact connected to the outer end of the first trace; and a second contact connected to the outer end of the second trace; the first and second spiral conductors being oriented such that a current traveling from the outer end of the first trace to the inner end of the first race generates a magnetic field having a first component perpendicular to the top surface in the central region of the first trace, and such that a current passing surface in the central region of the first trace, and such that a current passing from the inner end of the second trace to the outer end of the second trace generates a magnetic field having a second component perpendicular to the top surface in the central region of the second trace, the first component having a direction that is the same as said second component.