Partial gap magnetic core apparatus

(19)

(11)

EP 0 577 334 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	23.02.1994 Bulletin 1994/08

(43)	Date of publication A2:
	05.01.1994 Bulletin 1994/01

(21)	Application number: 93304935.5

(22)	Date of filing: 24.06.1993

(51)	International Patent Classification (IPC)⁵: H01F 3/14, H01F 37/02, H01F 27/34

(84)	Designated Contracting States:
	DE FR GB NL

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Priority:

02.07.1992 US 908129

(71)	Applicant: AT&T Corp.
	New York, NY 10013-2412 (US)

(72)	Inventor:
	Roy, Apurba Rockwall, Texas 75087 (US)

(74)	Representative: Johnston, Kenneth Graham et al
	AT&T (UK) Ltd. 5 Mornington Road Woodford Green Essex, IG8 OTU Woodford Green Essex, IG8 OTU (GB)

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References cited: :

(54)	Partial gap magnetic core apparatus

(57) Potted wire-wound loop-core structures are based on cores which include partial gapped inductors or transformers with their reduced dependence of inductance on current during operation. Total enclosure of gaps by encircling core material is both magnetic and physical, thereby avoiding fringing magnetic fields as well as joint failure due to differential expansion of potting material.

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