Current sensor
First Claim
1. A current sensor for detecting current flowing though a conductor, the current sensor comprising:
- a first magnetic core that is shaped like a ring to surround a portion of the conductor, the first magnetic core having at least two gaps therein, each of which is defined by adjacent ends spaced from each other by a first distance;
a magnetic sensing element placed in at least one of the gaps to detect a magnetic field induced in the first magnetic core by the current flowing through the conductor; and
a second magnetic core placed near the surrounded portion of the conductor to divide the conductor into at least two channel portions, wherein a second distance between the first and second magnetic cores is smaller than the first distance.
1 Assignment
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Accused Products
Abstract
A current sensor includes a first magnetic core that surrounds a portion of a conductor as a current path and has gaps therein, each of which is defined by adjacent ends spaced from each other by a first distance, a magnetic sensing element placed in at least one of the gaps, and a second magnetic core placed near the surrounded portion of the conductor to divide the conductor into channels. The second magnetic core is spaced from the first magnetic core by a second distance smaller than the first distance. Therefore, a magnetic resistance of the second magnetic core is smaller than that of the first magnetic core in a magnetic circuit formed by the first and second magnetic cores. As a result, a disturbance magnetic field mainly passes through the second magnetic core.
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Citations
11 Claims
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1. A current sensor for detecting current flowing though a conductor, the current sensor comprising:
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a first magnetic core that is shaped like a ring to surround a portion of the conductor, the first magnetic core having at least two gaps therein, each of which is defined by adjacent ends spaced from each other by a first distance;
a magnetic sensing element placed in at least one of the gaps to detect a magnetic field induced in the first magnetic core by the current flowing through the conductor; and
a second magnetic core placed near the surrounded portion of the conductor to divide the conductor into at least two channel portions, wherein a second distance between the first and second magnetic cores is smaller than the first distance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification