Low profile magnetic element
First Claim
1. A magnetic circuit element including a circuit board, at least two flux-conducting magnetic core arms penetrating the board, at least two flux-conducting magnetic core elements extending between the magnet core arms, one on each side of the circuit board, at least two series-connected primary windings on the board in at least partially encircling relation to at least one of the arms and at least two parallel-connected secondary windings on the board in at least partially encircling relation to at least one of the arms wherein the core arms and core elements form a single, unbranched, closed flux path, whereby all of the primary and secondary windings are linked by the same flux.
2 Assignments
0 Petitions
Accused Products
Abstract
A low profile magnetic element used in cooperation with a multilayer printed circuit board has two or more core arms penetrating the board from one outer surface to the other and a series of magnetic core elements, at least one on each side of the board, bridging pairs of the core arms to form a closed, unbranched flux path. Series-connected windings form a transformer primary and are wound on the core arms that penetrate the board. Parallel-connected windings form a transformer secondary and are also wound on the core arms. The series-connected windings and the parallel-connected windings may be buried windings printed on internal surfaces of the multilayer board. The connected in series primary windings all have the same number of turns and the parallel-connected secondary windings all have the same number of turns. The parallel secondary windings are connected in current additive fashion to afford a high current transformer output. Output treating circuitry can treat each output separately in parallel and identically, being connected between the winding outputs and their point of connection. The transformer core can be assembled entirely of C and I magnetic elements. In one embodiment, a pair of magnetic plates overlying the outer surfaces of the multilayer circuit board are in flux-conducting relation with all of the core arms penetrating the board.
31 Citations
31 Claims
- 1. A magnetic circuit element including a circuit board, at least two flux-conducting magnetic core arms penetrating the board, at least two flux-conducting magnetic core elements extending between the magnet core arms, one on each side of the circuit board, at least two series-connected primary windings on the board in at least partially encircling relation to at least one of the arms and at least two parallel-connected secondary windings on the board in at least partially encircling relation to at least one of the arms wherein the core arms and core elements form a single, unbranched, closed flux path, whereby all of the primary and secondary windings are linked by the same flux.
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13. A multilayer printed circuit board of the kind having first and second surfaces on first and second sides of the board and including a transformer with windings defined between layers of the board and a transformer core penetrating the layers of the board and about which the windings are wound;
- the improvement comprising;
a plurality of at least four magnetic core segments extending through the board from the first side to the second side at spaced apart locations;
a) said windings comprising a plurality of at least four windings, each at least partially encircling a separate one of the core segments where the core segments extend through the board;
b) a plurality of substantially planar first magnetic core elements at the first side of the board, each of the first core elements extending between a pair of the magnetic core segments in flux-conducting relation thereto such that each core segment at the first side of the board is joined in flux-conducting relation to another of the core segments by one of the substantial planar core elements at the first side of the board; and
c) a plurality of substantially planar second magnetic core elements at the second side of the board, each of the second magnetic core elements at the second side of the board extending between a pair of the magnetic core segments in flux-conducting relation thereto, each pair of core segments between which a second magnetic core element extends at the second side of the board being in a separate pair of the core segments joined in flux-conducting relation by first magnetic core elements at the first side of the board;
the magnetic core elements and core segments forming an unbranched, closed magnetic flux path extending across the first and second faces and through the layers of the board.
- the improvement comprising;
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14. A method of power conversion for providing high amperage, low voltage power including:
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(a) providing a printed circuit board, (b) forming holes through the printed circuit board, (c) locating magnetic core arms in the holes formed in the printed circuit board, (d) locating magnetic core elements in flux-conducting relation between the core arms on opposite faces of the printed circuit board to form a transformer core that has a single, unbranched, closed flux path, (e) winding a plurality of series-connected windings, on the core arms to form a transformer primary, (f) winding a plurality of parallel-connected windings, on the core arms to form a transformer secondary. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A multilayer printed circuit comprising:
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(a) a multilayer circuit board having first and second faces, (b) a transformer including;
(i) a magnetic core having;
(A) a plurality of core arms, each of which extends through a hole in the multilayer circuit board from the first face to the second face, (B) a plurality of magnetic core elements, each extending along the first or second surface between ends of the core arms to complete a magnetic circuit comprised of the core arms and core elements to form a single, branchless, closed flux path, (C) at least two series-connected windings forming a transformer primary printed on the multilayer circuit board, each in at least partially encircling relation to a core arm, (D) at least two parallel-connected windings forming a transformer secondary printed on the multilayer circuit board, each in at least partially encircling relation to a core arm, and (E) each core arm extending through the multilayer circuit board having at least one of the windings of the transformer primary or secondary wound thereon, whereby each winding couples the identical flux in the core. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A power magnetic component including:
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(a) a multilayer circuit board having first and second exterior faces, (b) a magnetic core comprising;
(i) a plurality of magnetic segments extending through the circuit board from one exterior face to the other exterior face, (ii) at least two magnetic elements exterior of the circuit board, each at one of the faces, and extending generally parallel to the faces of the board in flux conducting relation from one of the segments to another of the segments to form a single, closed, unbranched flux path, and (c) at least one buried winding carried on a surface of a layer of the multilayer circuit board intermediate the exterior faces and at least partially encircling one of the magnetic segments.
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Specification