Patent ID: 7135952
Filing Date: 2006-11-14
Classification: H01F,H05K,Y10T

Abstract:
1. A cell core transformer having significantly reduced leakage inductance between the primary and secondary windings, said transformer having a substantially flat surface and circuit components associated with said transformer mounted directly onto said flat surface comprising: a. a slab of ferromagnetic magnetic material having a series of rows and columns of spaced via holes therethrough; b. a first primary conductor extending through a first single one of said via holes formed in one of said rows of spaced via holes in said slab of ferromagnetic material for carrying current to create a magnetic field within a portion of the ferromagnetic material proximally encompassing said via hole; c. a second primary conductor extending through a second single one of said via holes formed in said slab of ferromagnetic material, said second via hole being adjacent to said first via hole and in the same row of spaced via holes as said first via hole; d. a third primary conductor extending through a third single one of said via holes formed in said slab of ferromagnetic material, said third via hole being adjacent to said second via hole and in the same column as said second via hole; e. a fourth primary conductor extending through a fourth single one of said via holes formed in said slab of ferromagnetic material, said fourth via hole being in the same column as said first via hole and in the same row as said third via hole so that said fourth via hole is adjacent to both said first and third via holes; f. said first second, third and fourth primary conductors coupled together so that the direction of current flowing in said first and third vias is opposite to the direction of current flow in said second and fourth vias whereby resulting flux generated between each via has the same orientation where the four adjoining magnetic fields intersect; g. a first secondary conductor in said slab of ferromagnetic material physically extending through the same single via hole as said first primary conductor, whereby a voltage is induced in said first secondary conductor by the magnetic flux produced by current flowing in said first primary conductor; h. a second secondary conductor physically extending through the same single via hole in said slab of ferromagnetic material as said second primary conductor, whereby a voltage is induced in said second secondary conductor by the magnetic flux produced by current flowing in said second primary conductor; i. a third secondary conductor physically extending through the same single via hole as said third primary conductor, whereby a voltage is induced in said third secondary conductor by the magnetic flux produced by current flowing in said third primary conductor; j. a fourth secondary conductor physically extending through the same single via hole as said fourth primary conductor, whereby a voltage is induced in said fourth primary conductor by the magnetic flux produced by current flowing in said fourth primary conductor; k. said primary conductors coupled together and said secondary conductors coupled together to provide a desired turns ratio for said cell transformer; and l. electrical printed circuits formed on top and bottom surfaces of the slab having circuits in electrical contact with said first and second primary conductors and said first and second secondary conductors.