Reduced magnetic flux current sensor
First Claim
1. A current sensor for measuring a primary electrical current inducing a magnetic flux density at least defined over a known region comprising:
- a first sensor for measuring the magnetic flux density due to the primary current over a first predetermined area within the known region; and
a second sensor for measuring the magnetic flux density due to the primary current over a second predetermined area within the known region, the magnetic flux density due to the primary current measured by said second sensor being a predetermined calibrated amount different from the magnetic flux density due to the primary current measured by said first sensor.
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Abstract
A current sensor for measuring a primary electrical current inducing a magnetic flux density defined over a known region comprises: a first sensor for measuring magnetic flux due to the primary current over a first predetermined area included within the known region; and a second sensor for measuring magnetic flux due to the primary current over a second predetermined area within the known region, the magnetic flux due to the primary current measured by the second sensor being a substantially predetermined calibrated amount different from the magnetic flux due to the primary current measured by the first sensor. The current sensor may further include a current source for generating a current inducing a magnetic flux density within the known region to at least partially offset the difference between the magnetic flux due to the primary current measured by the first sensor and the magnetic flux due to the primary current measured by the second sensor.
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Citations
28 Claims
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1. A current sensor for measuring a primary electrical current inducing a magnetic flux density at least defined over a known region comprising:
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a first sensor for measuring the magnetic flux density due to the primary current over a first predetermined area within the known region; and a second sensor for measuring the magnetic flux density due to the primary current over a second predetermined area within the known region, the magnetic flux density due to the primary current measured by said second sensor being a predetermined calibrated amount different from the magnetic flux density due to the primary current measured by said first sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of measuring a primary electrical current inducing a magnetic flux density defined over a known region, said method comprising the steps of:
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sensing magnetic flux density due to the primary current over a first predetermined area within the known region; and sensing magnetic flux density due to the primary current over a second predetermined area within the known region, the magnetic flux density due to the primary current sensed over the first area being a predetermined calibrated amount different from the magnetic flux density due to the primary current sensed over the second area. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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24. A method of measuring a primary electrical current inducing a magnetic flux density at least defined over a known region, said method comprising the steps of:
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sensing magnetic flux density due to the primary current over a predetermined area within the known region at a first predetermined time; and sensing magnetic flux density due to the primary current over the predetermined area within the known region at a second predetermined time after the first predetermined time, the magnetic flux density due to the primary current sensed at the first predetermined time being a predetermined calibrated amount different from the magnetic flux density due to the primary current sensed at the second predetermined time. - View Dependent Claims (25)
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26. A current sensor for measuring a primary electrical current inducing a magnetic flux density defined over a known region comprising:
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a sensor for measuring magnetic flux density due to the primary current over a predetermined area within the known region at a first predetermined time and at a second predetermined time so that the magnetic flux density due to the primary current measured over the predetermined area at the first predetermined time is a predetermined calibrated amount different from the magnetic flux density due to the primary current measured over the predetermined area at the second predetermined time; and a signal storage unit coupled to said sensor so as to receive a signal from said magnetic flux sensor providing the measurement of magnetic flux density due to the primary current measured over the predetermined area by said magnetic flux sensor at the first predetermined time. - View Dependent Claims (27, 28)
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Specification