Current sensor and measuring apparatus
First Claim
1. A current sensor comprising:
- a ring-shaped magnetic core that forms a first closed magnetic circuit that encloses a measured electrical path;
a magneto-electric converter that detects magnetic flux inside the magnetic core and outputs an electrical signal with an amplitude in keeping with a quantity of the magnetic flux;
a coil that is formed on the magnetic core and is supplied with a negative feedback current generated based on the electrical signal; and
a shield that is formed separately from the magnetic core and is disposed in a vicinity of the magnetic core, the magneto-electric converter and the coil,wherein a gap that increases a magnetoresistance of a second closed magnetic circuit, which is a closed magnetic circuit for magnetic flux that leaks from the magnetic core and includes the shield, a part of the magnetic core where the coil is formed, and the magneto-electric converter, is formed in the shield.
1 Assignment
0 Petitions
Accused Products
Abstract
There is provided a ring-shaped magnetic core that forms a closed magnetic circuit that encloses a measured electrical path, a magneto-electric converter that detects magnetic flux inside the magnetic core and outputs an electrical signal with an amplitude in keeping with a quantity of the magnetic flux, a coil that is formed on the magnetic core and is supplied with a negative feedback current generated based on the electrical signal, and an internal shield member disposed at least in a vicinity of the magneto-electric converter and the coil. A first gap that increases a magnetoresistance of a closed magnetic circuit, which is a closed magnetic circuit for leakage flux that leaks from the magnetic core and includes the internal shield member, a part of the magnetic core where the coil is formed, and the magneto-electric converter, is formed in the internal shield member.
2 Citations
8 Claims
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1. A current sensor comprising:
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a ring-shaped magnetic core that forms a first closed magnetic circuit that encloses a measured electrical path; a magneto-electric converter that detects magnetic flux inside the magnetic core and outputs an electrical signal with an amplitude in keeping with a quantity of the magnetic flux; a coil that is formed on the magnetic core and is supplied with a negative feedback current generated based on the electrical signal; and a shield that is formed separately from the magnetic core and is disposed in a vicinity of the magnetic core, the magneto-electric converter and the coil, wherein a gap that increases a magnetoresistance of a second closed magnetic circuit, which is a closed magnetic circuit for magnetic flux that leaks from the magnetic core and includes the shield, a part of the magnetic core where the coil is formed, and the magneto-electric converter, is formed in the shield. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification