Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1992-03-02
1993-06-08
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Magnetometers
307309, 3242072, 324537, 340438, 340635, 340661, 34087013, G01R 3306, G01R 3102, G08C 1506, G08B 2100
Patent
active
052182983
ABSTRACT:
A magnetic-field monitor includes a Hall sensor of the kind having a voltage reference terminal and a signal output terminal for being energized by applying a DC voltage across the output terminal and the reference terminal, and generates through the output terminal a low value current when the ambient magnetic field strength is low and a high output current when the magnetic field is high. The Hall sensor is connected via a pair of conductors to a Hall-sensor decoder circuit that is energized by a DC voltage source and in turn energizes the sensor via the pair of conductors. The decoder includes a current mirror circuit that mirrors the Hall-sensor current into a voltage divider. Three voltage comparators having different threshold voltages are connected at three points in the voltage divider. The three binary output signals of the comparators constitute a composite binary indication whether a short circuit fault or an open circuit fault condition exists in the conductors connecting the Hall element to the decoder, and when there is no fault further indicates whether the ambient magnetic field at the remote Hall sensor is high or low. A system including four such monitors is described wherein the fault signals are combined and the real time indication of the magnetic-field status at each remote sensor is continuously provided.
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Allegro Microsystems Inc.
Strecker Gerard R.
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