Isolated current sensor for DC to high frequency applications
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United States of America Patent
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Sep 3, 1996
Grant Date -
N/A
app pub date -
Nov 30, 1993
filing date -
Nov 30, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Current in a line is measured by passing it through a coil, having at least one turn, linking a small high permeability core; passing a measuring current through a bucking winding around the same core; and controlling the measuring current to buck the magnetomotive force of the line current so that the core flux stays below the saturation level. The measuring current may flow through a precision resistor so that a voltage across the resistor is an accurate measure of the line current. The measuring current is obtained from a high frequency switching circuit which senses the change of flux in the core. In normal operation the circuit switches when the core flux has risen to a predetermined value, such as 60% or 80% of the saturation value. If drift or extreme transients cause the flux to reach the saturation level, a sensing and correction circuit re-establishes operation between the desired points.
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