Hybrid integrated circuit planar transformer
October 30, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3833872 Transmission line pulse transformers Ferrite core Hybrid circuit device Impedance converting transformer formed of conductors extending through a magnetic housing Encapsulated electronic circuit Thick film delay line comprising a plurality of stacked delay assemblies formed by a printing process Laminated hybrid integrated DC-DC converter Transformer with wire lead isolation slots Shunt transformer InventorsAssigneeApplicationNo. 969508 filed on 10/30/1992US Classes:336/83, CORE FORMS CASING29/602.1, Electromagnet, transformer or inductor336/96, Potted type336/200, Printed circuit-type coil336/212, PLURAL PART CORE363/125In rectifier systemsExaminersPrimary: Kozma, Thomas J.Attorney, Agent or FirmForeign Patent References
International ClassesH01F 027/26H01F 027/30 AbstractA planar transformer includes a multilayer printed circuit board having a plurality of spiral windings formed by metalization on various surfaces of the printed circuit board. A ferrite core assembly includes first and second core sections disposed on opposite sides of the printed circuit board and completely confining the conductors of the spiral windings. Each core section includes a thin, flat plate. The two flat plates are integral with or abut thin post sections that are thick enough to allow the printed circuit board to be accommodated between the first and second core sections. In one embodiment of the invention, the planar transformer is incorporated on the printed circuit board with other circuitry to form a low noise battery charger which is encapsulated in a male power connector.Other References
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