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Current sensor

A current sensor and current technology, applied in the direction of only measuring current, voltage/current isolation, measuring current/voltage, etc., can solve problems such as inability to offset the impact, and achieve low-cost effects

Inactive Publication Date: 2020-02-11
YAZAKI CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is the drawback that this only works when the external magnetic field is uniform, thus not counteracting the effect of a varying external magnetic field

Method used

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Examples

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Effect test

no. 1 example

[0029] Below, will refer to figure 1 A first embodiment of the present invention will be described. figure 1 The illustrated current sensor 1 is a sensor configured to detect a current I1 flowing through a bus bar (measurement object) 2 . In the figure, a current I1 flows in the bus bar 2 in a direction perpendicular to the paper surface, and a magnetic field H1 is generated by this current I1. The magnetic field H1 is generated around an axis corresponding to the flow direction of I1 (ie, the direction perpendicular to the paper surface).

[0030] The current sensor 1 includes a magnetic field detection element 11, a first coil C1, and a second coil C2. The magnetic field detection element 11 is an element that outputs a voltage corresponding to the magnitude of the magnetic field, and is arranged around the bus bar 2 (a range where the magnetic field H1 enters or penetrates).

[0031] The output of the magnetic field detection element 11 may be affected by an external mag...

no. 2 example

[0043] Next, refer to figure 2 A second embodiment of the present invention will be described. The difference between the second embodiment and the first embodiment mainly lies in the arrangement position of the magnetic field detection element 11 . In the second embodiment, the magnetic field detection element 11 is arranged outside the second coil C2 along the magnetic field generated by the second coil C2. Furthermore, in the second embodiment, the magnetic field detection element 11 and the second coil C2 are arranged oppositely along the axial direction of the second coil C2 with a space therebetween. Notice, figure 2 The direction of the magnetic field H3 in the arrangement position of the second embodiment shown is the same as the direction of the magnetic field H3 inside the second coil C2.

[0044] As in the case of the first embodiment, in this case, an induced current I2 is generated in the first coil C1 based on a change in the external magnetic field H2, and ...

no. 3 example

[0046] Next, refer to image 3 A third embodiment of the present invention will be described. The difference between the third embodiment and the first embodiment mainly lies in the arrangement positions of the magnetic field detection elements 11 . In the third embodiment, the magnetic field detection element 11 is arranged outside the second coil C2 along the magnetic field generated by the second coil C2. Furthermore, in the third embodiment, the magnetic field detection element 11 and the second coil C2 are arranged oppositely along the radial direction of the second coil C2 with a space therebetween. Notice, image 3 The direction of the magnetic field H3 in the arrangement position of the third embodiment shown is opposite to the direction of the magnetic field H3 inside the second coil C2.

[0047] Thus, unlike the first and second embodiments, in the third embodiment, the winding directions of the first coil C1 and the second coil C2 are the same.

[0048] Next, the ...

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Abstract

A current sensor which can cancel an effect of a varying external magnetic field at a low cost is provided. The current sensor includes a magnetic field detecting element configured to detect a magnetic field generated due to a current flowing through a bus bar. An induced current is generated in a first coil due to an external magnetic field generated around the magnetic field detecting element.A second coil is connected to the first coil and configured to generate, upon flow of the induced current, a magnetic field that cancels the external magnetic field generated around the magnetic fielddetecting element.

Description

technical field [0001] The invention relates to a current sensor. Background technique [0002] Conventionally, a current sensor using a magnetic field detection element is known. The current sensor detects a magnetic field generated by a current flowing through a measurement object using a magnetic field detection element, and calculates a current value from the magnetic field detected by the magnetic field detection element. [0003] The above-described current sensor may be affected by an external magnetic field (a magnetic field other than a magnetic field generated by a current flowing through a measurement object), causing an error in the current sensor. In order to solve this problem, a current sensor provided with a shield for blocking an external magnetic field arranged around a magnetic field detection element has been proposed (see Patent Document 1 listed below). However, there is a drawback that the use of the shield causes an increase in size and cost. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R15/20
CPCG01R15/20G01R19/0092G01R15/18G01R15/185G01R15/207G01R33/0017G01R33/02G01R15/181G01R33/0005
Inventor 大野千寻庄田隆博
Owner YAZAKI CORP
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