Browse Prior Art Database

High Manufacturabilty, Low Cost Torroidal Inductor

IP.com Disclosure Number: IPCOM000036396D
Original Publication Date: 1989-Sep-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 3 page(s) / 91K

Publishing Venue

IBM

Related People

Johnston, CN: AUTHOR [+2]

Abstract

This invention relates to high frequency magnetics, which high frequencies normally require fewer turns. By using copper patterns on the printed circuit card, a small torroidal or square magnetic core, and a plastic cap with copper traces glued or plated onto it, an inductor can be constructed. The figure shows an exploded view of the inductor/ transformer.

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High Manufacturabilty, Low Cost Torroidal Inductor

This invention relates to high frequency magnetics, which high frequencies normally require fewer turns. By using copper patterns on the printed circuit card, a small torroidal or square magnetic core, and a plastic cap with copper traces glued or plated onto it, an inductor can be constructed. The figure shows an exploded view of the inductor/ transformer.

A printed circuit card 10 has deposited thereon a copper pattern of a plurality of lands 12. A plastic cap 14 is provided which has a series of copper bands 15 plated thereon, which conform in size and spacing to the lands 12. A torroidal magnetic core 16 (which can be gapped, if desired) is received within the cap 14 by a suitable adhesive. The cap 14 is then placed onto the circuit card 10, such that the lands 12 and bands 15 mate to form coil configurations around the core. The lands and bands are soldered at points A through F by standard surface mounting.

The winding of the magnetic component starts on the card and travels over the core on the plastic cap, then through a solder connection and under the core on the card. This path is continued and forms the magnetic winding around the core. An additional feature is the ability to connect to the inductor/transformer at any turn in the winding by simply running a copper circuit pattern to the turn on the printed circuit card. As shown in the drawing, the lettered places would be soldered so that point A on c...