Magnetoresistive current detector

Details Magnetoresistive current detector Magnetoresistive current detector

1981-12-18

1984-08-07

Levy, Stewart J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Magnetic saturation

323294, 323368, 324252, G01R 3300, G01R 3302

Patent

active

044646259

ABSTRACT:
In a magnetoresistive current detector, which includes a conductor carrying a current to be measured, which in turn generates an external magnetic field, four bridge elements are connected to one another so as to constitute a Wheatstone bridge. The Wheatstone bridge is adapted to be fed by a supply current from a current- or voltage-source and includes two pairs of ferromagnetic and magnetoresistive thin films which have hard and easy axes, respectively, and each thin film constitutes a respective bridge element. The thin films of each pair are magnetostatically coupled to one another, so that the portion of the supply current flowing in each thin film of each pair generates an auxiliary magnetic field, which has a direction along the hard magnetic axis of the other thin film of the same pair. The thin films of each pair form bridge portions connected to one another at respective bridge output terminals and all these films have substantially equal respective thicknesses; the external magnetic field has a direction along the direction of the hard magnetic axes of each of the thin films.

REFERENCES:
patent: 3546579 (1970-12-01), Paul et al.
patent: 3555310 (1971-01-01), Haeusler
patent: 3649912 (1972-03-01), Nakamura
patent: 3820089 (1974-06-01), Lama
patent: 4385273 (1983-05-01), Lienhard et al.
"Magnetoresistive Current Sensor", by C. H. Bajorek et al., in IBM Tech. Disc. Bull., vol. 18, No. 8, Jan. 1976, pp. 2745-2748.
"Self-Biased Magnetoresistive Bridge Configuration for Current Measurement", by Feng, in IBM Tech. Disc. Bull., vol. 18, No. 11, Apr. 1976, pp. 3847-3851.
"A Permalloy Current Sensor", by C. H. Bajorek, et al., in IEEE Transactions on Magnetics, vol. MAG-12, No. 6, Nov. 1976, pp. 813-815.

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