Magnetic field sense system for the protection of connected elec

Details Magnetic field sense system for the protection of connected elec Magnetic field sense system for the protection of connected elec

1995-07-11

1997-05-13

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetometers

1286532, 324251, 324260, 340600, 361 93, G01R 3302, G01R 3307, A61B 5055, H02H 700

Patent

active

056296223

ABSTRACT:
A protective circuit controls electronic equipment in the presence of a high level electro-magnetic field. The protective circuit includes a field sensor arrangement which provides output signals that are indicative of magnetic field strength components that are aligned along desired spatial axes. A vector converter circuit is connected to the field sensors and provides an output having a magnitude that is indicative of the vector sum of the electro-magnetic field strength components. A first indicator is responsive to an output from the vector converter reaching a first threshold to manifest a caution signal that the magnetic field strength has reached a cautionary level. A second indicator is responsive to an output from the vector converter reaching a second threshold that is higher than the first threshold, to disable the electronic equipment. Further circuitry is provided to re-enable the electronic equipment if it is moved outside of the area where the magnetic field exceeds the first threshold.

REFERENCES:
patent: 3418572 (1968-12-01), Humphreys, Jr.
patent: 4954812 (1990-09-01), Lebron
patent: 5256960 (1993-10-01), Novini
patent: 5311130 (1994-05-01), Bill et al.
patent: 5512823 (1996-04-01), Nepveu

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