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1. (US20100219926) Low-profile transformer
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Claims

1. A transformer, comprising:
a substrate having first and second surfaces;
a first board mounted on said substrate first surface;
a second board mounted on said substrate second surface;
said first and second boards being identical to one another and being mounted on the respective proximate substrate surfaces as mirror images of one another;
each of said first and second boards having a plurality of dielectric layers with electrically-conductive sheet windings embedded therein;
said sheet windings being electrically connected;
a core operatively arranged to provide a path for magnetic flux attributable to a current in said windings; and
wherein each of said first and second boards has at least three terminals on a surface thereof that are electrically connected to at least one winding within such board and that are operatively arranged to allow different voltages to be tapped off.
2. A transformer as set forth in claim 1, wherein at least one winding of said first board is connected in series with at least one winding of said second board.
3. A transformer as set forth in claim 2, wherein said series-connected windings form a part of the primary windings of said transformer.
4. A transformer as set forth in claim 1, wherein at least one, winding of said first board is connected in parallel with at least one winding of said second board.
5. A transformer as set forth in claim 4, wherein said parallel-connected windings form a part of the secondary windings of said transformer.
6. A transformer as set forth in claim 1, wherein at least one winding of said first board is independent of all other windings.
7. A transformer as set forth in claim 1, wherein at least one, winding of said second board is independent of all other windings.
8. A transformer as set forth in claim 1, wherein said core is formed by assembling two core portions, wherein a first of said core portions is arranged proximate said first board, and wherein a second of said core portions is arranged proximate said second board.
9. A transformer as set forth in claim 8, wherein at least one of said core portions is E-shaped.
10. A transformer as set forth in claim 8, wherein at least one of said core portions is I-shaped.
11. A transformer as set forth in claim 1, wherein said substrate is a printed circuit board.
12. A transformer as set forth in claim 11, wherein at least one of said transformer windings is located within said printed circuit board.
13. A transformer as set forth in claim 1, wherein said first and second boards are formed by a printed circuit technique.
14. A transformer as set forth in claim 1, wherein different windings within a board are connected by vias.
15. A transformer as set forth in claim 1, wherein at least one winding of said first board is connected to at least one winding of said second board by at least one via.
16. A transformer as set forth in claim 1, and further comprising a third board mounted on said first board and electrically connected thereto, and wherein at least one winding of said third board is electrically connected to at least one winding of said first board.
17. A transformer as set forth in claim 1, and further comprising a fourth board mounted on said second board and electrically connected thereto, and wherein at least one winding of said fourth board is electrically connected to at least one winding of said second board.
18. A transformer as set forth in claim 17, wherein said third and fourth boards are identical.
19. A transformer as set forth in claim 17, wherein said third and fourth boards are not identical to said first and second boards.
20. A transformer as set forth in claim 18 wherein said third and fourth boards are mounted on said first and second boards, respectively, as mirror images of one another.
21. A transformer as set forth in claim 17, wherein said third and fourth boards each have at least three terminals on a surface thereof that are electrically connected to at least one winding with such board, and that are operatively arranged to allow different voltages to be tapped off.
22. A transformer as set forth in claim 17, wherein at least one winding of said third board is connected in parallel with at least one winding of said first board, and wherein at least one winding of said fourth board is connected in parallel with at least one winding of said second board.
23. A transformer as set forth in claim 17, wherein at least one winding of said third board is connected in series with at least one winding of said first board, and wherein at least one winding of said fourth board is connected in series with at least one winding of said second board.
24. A transformer as set forth in claim 1, wherein each board contains groups of terminations associated with the windings of that particular board.
25. A transformer as set forth in claim 24, wherein the group of terminations on one board is arranged to provide adequate voltage clearance relative to the group of terminations on an adjacent board.