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Simple Low-Cost Inductor

IP.com Disclosure Number: IPCOM000115284D
Original Publication Date: 1995-Apr-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 4 page(s) / 82K

Publishing Venue

IBM

Related People

Walters, MM: AUTHOR

Abstract

Two metallized plates 14 of magnetic permeable material are attached together to form an inductor 10 with an air gap (shown in Fig. 3b) in the magnetic path. The normal plating and joining processes add material that separates the surfaces of the two plates, to form an air gap. A multi-winding inductor can be realized by placing separate metallized strips 18 on the magnetic material and then interconnecting the strips with the traces 20 of a printed circuit board 12. A single multi-winding inductor can satisfy a wide range of applications by interconnecting the windings in various series and parallel combinations, or the windings can be used separately to realize a coupled inductor.

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Simple Low-Cost Inductor

      Two metallized plates 14 of magnetic permeable material are
attached together to form an inductor 10 with an air gap (shown in
Fig. 3b) in the magnetic path.  The normal plating and joining
processes add material that separates the surfaces of the two plates,
to form an air gap.  A multi-winding inductor can be realized by
placing separate metallized strips 18 on the magnetic material and
then interconnecting the strips with the traces 20 of a printed
circuit board 12.  A single multi-winding inductor can satisfy a wide
range of applications by interconnecting the windings in various
series and parallel combinations, or the windings can be used
separately to realize a coupled inductor.

      The inductor can be fabricated using high-volume printed
circuit technology to minimize the cost.  Figs. 2 and 3 illustrate
the key process steps of a single winding inductor.  Fig. 2 shows a
single ferrite plate 30, that is metallized with copper 32.
Subsequent processing will cut the ferrite plate (along cut line 34)
into 4 pieces to yield two, single winding inductors.

      The ferrite plate 30, is formed by a mold or machined with
slots 36 (or holes).  It is then metallized on the top planer surface
and in the slots using standard plating technology.  The copper is
etched away from the end (in the air gap region) to yield the copper
pattern 32.  The plate is then cut into four metallized ferrite
pieces along the cut lines 34.  T...