Patent ID: 7277002

Claim:
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 one of said via holes formed 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 one of said via holes formed in said slab of ferromagnetic material, said second via hole being adjacent to said first via hole; d. said first and second primary conductors coupled together so that the direction of current flowing in said first via is opposite to the direction of current flow in said second via whereby resulting flux generated between said first and second via has the same orientation where the two adjoining magnetic fields intersect; e. a first secondary conductor in, said slab of ferromagnetic material extending through the same 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; f. a second secondary conductor extending through the same 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; g. said primary conductors coupled together and said secondary conductors coupled together to provide a desired turns ratio for said cell transformer; and h. 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.