Electrical current sensing apparatus

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Magnetic saturation

Reexamination Certificate

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C324S11700H

Reexamination Certificate

active

06271656

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to an apparatus which senses an electrical current in a conductor and includes a magnetic flux sensor.
Hall effect devices have been used to sense variations in magnetic flux resulting from a flow of current through a conductor. Some of these known devices have used a flux concentrator to concentrate magnetic flux produced around the flow of current through the conductor. It has previously been suggested that an electrical current sensing apparatus could be constructed in the manner disclosed in U.S. Pat. Nos. 4,616,207 and 5,416,407.
SUMMARY OF THE INVENTION
The present invention provides an electrical current sensing apparatus which includes a magnetic flux sensor. The magnetic flux sensor is disposed within or adjacent to an opening formed in a conductor of electrical current. A variation in the flow of current through the conductor varies the flux to which the magnetic flux sensor is exposed.


REFERENCES:
patent: 3234461 (1966-02-01), Trent et al.
patent: 4506214 (1985-03-01), Lienhard et al.
patent: 4599564 (1986-07-01), Kelleher et al.
patent: 4616207 (1986-10-01), Knapp, Jr. et al.
patent: 4794326 (1988-12-01), Friedl
patent: 5041780 (1991-08-01), Rippel
patent: 5172052 (1992-12-01), Wells
patent: 5416407 (1995-05-01), Drafts
patent: 5615075 (1997-03-01), Kim
patent: 5917401 (1999-06-01), Smith et al.

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