Device having a shaped, magnetic toroidal member and a magnetoresistive sensor for detecting low magnitude electrical currents
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United States of America Patent
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Nov 16, 1999
Grant Date -
N/A
app pub date -
Jun 9, 1997
filing date -
Nov 10, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A device for detecting low magnitude electrical currents includes a generally toroidally-shaped member made of magnetic material that provides an air gap, and a magneto-resistive device in the form of a bridge located in the air gap for sensing a current flowing through a conductor that passes through the member. In order to reduce damage due to overcurrents, the member has a portion of reduced cross-sectional area to cause saturation of the member. The device can be used in an earth leakage current detector.
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