Current sensor

A current sensor and current technology, applied in the direction of measuring current/voltage, instruments, measuring electrical variables, etc., can solve the problems of decreased current detection accuracy, increased component cost, and easy detection of external magnetic noise.
CN101900754AInactive Publication Date: 2010-12-01SAE MAGNETICS (HK) LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SAE MAGNETICS (HK) LTD
Publication Date
2010-12-01
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a current sensor including, a current-measured wiring including parallel wiring sections in which portions of the same wiring are arranged in parallel such that electric current to be measured flows therein in opposite directions each other; a magnetism detection unit which is arranged between parallel wirings located in the parallel wiring sections and detects a magnetic field in a direction perpendicular to a plane formed by the parallel wirings; a current detection unit which detects electric current flowing in the current-measured wiring, based on the magnetic field detected by the magnetism detection unit; and a magnetic core surrounding the parallel wiring sections so as to intensify the magnetic field generated around the parallel wirings located in the parallel wiring sections when electric current flows in the wirings. The magnetic core has a pair of plates facing each other over a plane formed by the parallel wirings, the pair of plates having flat and parallel inner faces, and the magnetism detection unit is arranged between the pair of plates of the magnetic core.
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Description

technical field

[0001] The present invention relates to current sensors, and more particularly to current sensors using magnetic sensors. Background technique

[0002] In recent years, with the popularization of electronic devices, the demand for current sensors that detect currents has gradually increased. In particular, along with the miniaturization of instruments to be measured, the current sensor itself must also be miniaturized, and it is also necessary to reduce the cost by simplifying the structure. Of course, the precision and sensitivity of current detection also need to be improved.

[0003] Patent Document 1 discloses an example of a current sensor. The general structure of the magnetic sensor disclosed in this patent document 1 is as follows Figure 1A shown. As shown in the figure, in the magnetic sensor, a measured current pattern 103 formed on a printed circuit board 101 is covered with a magnetic core 102 having a convex portion 102a, and the magnetic sen...

Claims

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