Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Magnetic saturation
Patent
1988-07-07
1990-06-26
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Magnetic saturation
307309, G01R 3300, G01R 3306
Patent
active
049375210
ABSTRACT:
A current detecting device comprises a substrate, a magnetism sensing member made of ferromagnetic magnetoresistance element, an insulating member, and a conducting member, and these members are formed by a photolithography technique such that the magnetism sensing member is electrically isolated from the conducting member by the insulating member. When a current flows into the conducting member, the magnetism sensing member responds to a magnetic field generated by the current. At this time, the resistance of the magnetism sensing member changes due to a magnetoresistance effect in accordance with the intensity of the current. Therefore, the current can be measured by detecting the resistance change. In such a current detecting device, there is no reactance component thereby achieving high sensitivity when detecting the current.
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Bowen et al; "Magnetoresistive . . . "; IBM Tech. Dis. Bull.; vol. 17; No. 3; Aug. 1974, pp. 728-729.
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IBM Technical Disclosure Bulletin, vol. 18, No. 8, Jan. 1976, pp. 2745-2748, New York, US; C. H. Bajorek et al.: "Magnetoresistive Current Sensor".
IBM Technical Disclosure Bulletin, vol. 18, No. 11, Apr. 1976, pp. 3847-3851, New York, US; J. S. Feng: "Self-Biased Magnetoresistive Bridge Configuration for Current Measurement".
Radio Fernsehen Elektronik, vol. 34, No. 5, May 1985, pp. 316-319, Berlin, DD; U. Loreit et al.: "Magnetoresistive Sensoren in der Mess- und Speichertechnik".
Ao Kenichi
Arasuna Toshikazu
Izawa Ichiroh
Kakehi Tatuya
Sakurai Hiroshi
Karlsen Ernest F.
Nippondenso Co. Ltd.
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