High resolution current sensing apparatus
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United States of America Patent
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-
Feb 19, 2002
Grant Date -
N/A
app pub date -
Sep 28, 1999
filing date -
Sep 28, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A current sensor includes a deflectable member disposed in a magnetic field. Nulling or compensating members may be mechanically coupled to the deflectable member. Feedback or readout devices coupled to the structure provide signals indicative of deflection of the deflectable member under the influence of applied current and the magnetic field. Nulling current applied to the nulling members tends to oppose deflection of the deflectable member. The nulling current may be modulated to drive the feedback signal to a desired level and is used as a basis for calculating the current to be measured. The current may be measured directly upon calibration of feedback devices coupled to the deflectable member or to the nulling members. Arrays of sensors may be coupled to common busses for applying measured and nulling currents to sensors of the arrays and for detecting feedback signals.
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