Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent
1981-12-18
1985-06-25
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural inputs
324117R, 324252, G01R 2106, G01R 3300, G01R 3302
Patent
active
045256683
ABSTRACT:
In an apparatus for the measurement of electrical power, including a multiplier which receives on an input thereof an electrical signal proportional to the voltage component of the electrical power, and which is subjected to an external magnetic field proportional to the current component of the electrical power, an auxiliary magnetic field is applied to the multiplier. The multiplier is a Wheatstone bridge including four ferromagnetic and magnetoresistive thin films, and the magnetic fields have a direction along the direction of the hard magnetic axes of each of the thin films. The thin films are so positioned that the magnetization of two electrically oppositely disposed thin films resulting from the application of the external magnetic field thereto is rotated in a direction opposite to that of the correspondingly resulting magnetization of the remaining thin films, following application of the auxiliary magnetic field to the films.
REFERENCES:
Wieder, H. H., "Hall Generators and Magnetoresistors; Pion Limited, London; pp. 69, 70, 74, 75, 76, 77, 85, 86, 87, 88, 89, 90, 91, 92.
Bajorek et al., "A Permalloy Current Sensor; IEEE Trans. on Magnetics; vol. MAG-12; No. 6; Nov. 1976; pp. 813-815.
Bajorek et al., "Magnetoresistive Current Sensor"; IBM Tech. Dis. Bull.; vol. 18; No. 8; Jan. 1976; pp. 2745-2748.
Lienhard Heinz
Petr Jan
Karlsen Ernest F.
LGZ Landis & Gyr Zug AG
Marmorek Ernest F.
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