US 6,188,305 B1Granted

Transformer formed in conjunction with printed circuit board

AssigneeInternational Business Machines Corporation

InventorsChi Shih Chang, Michael Joseph Johnson, Craig Neal Johnston, John Matthew Lauffer

Life of this patent

Estimating the term…

Loading patent…

Abstract

A transformer comprises a printed circuit board having elongated conductors printed thereon, a ferrite core having a bottom mounted onto the printed circuit board and a flex circuit. The flex circuit comprises a dielectric sheet and elongated conductors printed on both faces of the sheet. The flex circuit is contoured around a top and sides of the core. The conductors of the flex circuit are surface bonded to respective conductors of the printed circuit board to form a series of primary windings and a series of secondary windings around the core. Provision of the upper portions of the windings by means of the flex circuit is economical because it does not require handling of discrete conductor portions.

Claims3

Dependent claims

An electromagnetic device comprising:

a printed circuit board having elongated conductors printed thereon;
a ferrite core having a bottom mounted onto said printed circuit board;
and
a flex circuit comprising a flexible dielectric sheet and elongated conductors printed on said sheet, said flex circuit being contoured around a top and sides of said core, said conductors of said flex circuit being surface bonded to respective conductors of said printed circuit board to form a series of windings around said core;
and
wherein said conductors are printed on one side of said sheet and said flex circuit further comprises other elongated conductors printed on the other side of said sheet, said other conductors being surface bonded to respective conductors of said printed circuit board to form another series of windings around said core.

3 more elements

Dependencies are inferred from the claim text.