DC current sensor using a continuous annularly shaped detection core
AssigneeSumitomo Special Metals Co., Ltd.
InventorsMakoto Kawakami, Shigeru Yamaguchi
Life of this patent
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Abstract
A DC current sensor using a continuous annularly-shaped detecting core of soft magnetic material; a continuous annularly-shaped exciting core of soft magnetic material intersecting with the detecting core perpendicular to the plane thereof; respective detecting and exciting coils wound respectively around the detecting and the exciting cores; an AC excitation of a given frequency applied to the exciting coil to saturate the detecting core; a wire conducting DC current to be detected extending through the detecting core to establish a magnetic flux therein; and a detector connected to the detecting coil for detecting the magnetic flux modulated by the AC excitation to detect the DC current flowing in the wire.
Claims10
A DC current sensor, comprising:
- a continuous annularly-shaped detecting core of soft magnetic material;
- a continuous annulalry shaped exciting core of soft magnetic material intersecting with said detecting core perpendicular to the plane thereof;
- respective detecting and exciting coils wound respectively around said detecting and said exciting cores;
- means for applying an AC excitation of a given frequency to said exciting coil to saturate said detecting core;
- a wire conducting DC current to be detected extending through said detecting core to establish a magnetic flux in said detecting core;
- and
- means connected to said detecting coil for detecting the magnetic flux modulated by said AC excitation to detect the DC current flowing in said wire.
A DC current sensor, comprising:
- a continuous annularly-shaped detecting core of soft magnetic material;
- a continuous annularly-shaped exciting core of soft magnetic material intersecting with said detecting core perpendicular to the plane thereof;
- respective detecting and exciting coils wound around said detecting core;
- means for applying an AC excitation of a given frequency to said exciting coil to saturate said detecting core;
- a wire conducting DC current to be detected and extending through said detecting core to establish a magnetic flux in said detecting core;
- and
- means connected to said detecting coil for detecting the magnetic flux modulated by said AC excitation to detect the DC current flowing in said wire.
Dependencies are inferred from the claim text.