Electrical resistors – Resistance value responsive to a condition – Magnetic field or compass
Reexamination Certificate
2000-03-03
2001-08-07
Easthom, Karl D. (Department: 2832)
Electrical resistors
Resistance value responsive to a condition
Magnetic field or compass
C324S11700H, C324S124000, C324S207200
Reexamination Certificate
active
06271744
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to arrangements for current sensing via use of the Hall effect, and is particularly directed to an arrangement that provides heightened sensitivity while utilizing a low-cost Hall effect sensor.
BACKGROUND OF THE INVENTION
It is known to sense the current flowing through a line by sensing the magnetic field that is generated by the current flow. One known technique for sensing the magnetic field, and thus sensing the current, is to utilize a Hall effect sensor. The Hall effect sensor is placed in close proximity to the current-carrying line such that the magnetic field that permeates the space in the vicinity of the line also permeates the Hall effect sensor.
Strength of the magnetic field (i.e., the magnetic flux value) is dependent upon the current size flowing through the current-carrying line. In order for the Hall effect sensor to accurately perceive very small current flow values, the sensor must have a relatively high sensitivity for the magnetic field. A Hall effect sensor that has a relatively high sensitivity often has a higher cost.
SUMMARY OF THE INVENTION
In accordance with one aspect, the present invention provides a current sensing arrangement that includes a Hall effect sensor. A current-carrying line encircles the Hall effect sensor. A ferromagnetic sheet material covers a portion of the current-carrying line and a portion of the Hall effect sensor.
In accordance with another aspect, the present invention provides a current sensing arrangement that includes means for sensing a current via magnetic field sensing and for providing an output indicative of the amount of sensed current. Means provides a current that encircles the means for sensing, and the provision of the current causes an output of a magnetic field. Means concentrates the magnetic field output from the means for providing a current to the means for sensing via transmission through a ferromagnetic sheet material.
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Easthom Karl D.
Tarolli, Sundheim, Covell Tummino & Szabo L.L.P.
TRW Inc.
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