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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.

Inactive Publication Date: 2010-12-01
SAE MAGNETICS (HK) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, even in the state where the current does not flow through the measured current pattern 103, the more sensitive the magnetic sensor, the easier it is to detect external magnetic noise, resulting in a problem that the accuracy of current detection decreases.
In addition, the above-mentioned magnet core 102 has the convex portion 102a on the inner surface and thus has a complicated shape, thereby causing a problem of an increase in component cost.

Method used

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Embodiment approach 1

[0066] refer to Figure 2 to Figure 18 A first embodiment of the present invention will be described. Figure 2 to Figure 7 is a state diagram showing the structure and assembly of a current sensor. Figure 8 is a schematic diagram showing the structure of the current sensor. Figure 9 to Figure 11 is a state diagram showing the magnetic field generated to the current sensor. Figure 12 to Figure 18 It is a figure explaining the detailed structure and operation|movement of the magnetic sensor which comprises a current sensor.

[0067] First, refer to Figure 2 to Figure 7 Explain the structure and assembly procedure of the current sensor. figure 2 Indicates the surface of the substrate 1 as the substrate constituting the current sensor, Figure 3A Indicates its back. Such as figure 2 and Figure 3A As shown, the substrate 1 is a substantially rectangular thin plate member. As shown in FIG. 3 , on the back surface of the substrate 1 , a U-shaped (U-shaped) current ba...

Embodiment approach 2

[0108] Next, refer to Figure 19 to Figure 20 A second embodiment of the present invention will be described. Figure 19 The schematic structure of the current sensor of this embodiment is shown, Figure 20 is a diagram showing the state of the magnetic field.

[0109] In the current sensor in this embodiment, the shape of the magnet core 5 is different from that in the first embodiment described above. Specifically, as Figure 19 As shown, the end surface of the magnet core 5 of this embodiment is annular, and the shape of a pair of wall portions 51 and 52 facing the substrate 1 is formed in a state separated from each other at the central portion. That is, each wall portion 51, 52 of the pair of wall portions 51, 52 forming the long sides is bent at a specific angle at the center to form a mountain shape, and each concave portion formed by the bending faces the inner side of the magnet core 5 body. That is, in the opposite configuration. And since the curved part of eac...

Embodiment approach 3

[0114] Next, refer to Figure 21 A third embodiment of the present invention will be described. Figure 21 The structure of the current sensor of this embodiment is shown, and it shows another structure of a magnet core especially.

[0115] As shown in the figure, the magnet core 5 of the present embodiment has a rectangular end surface and is formed in a cylindrical shape as in the first embodiment described above. In this embodiment, in particular, a pair of wall portions 51 and 52 that are parallel to the substrate 1 and face the long side of the substrate 1 are further widened and formed. That is, in Embodiment 1, the width of each wall portion of the magnet core 5 located in the height direction (length) of the cylindrical body is constant, but in the present embodiment, the width of the pair of wall portions 51 and 52 on the long sides is greater than that of The pair of wall parts 53 and 54 on the short side connected to the pair of long side wall parts 51 and 52 has ...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R33/09
CPCG01R15/207
Inventor 笠岛多闻
Owner SAE MAGNETICS (HK) LTD
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