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Current sensor

A technology of current sensor and magnetic sensor, which is applied in the direction of measuring current/voltage, instruments, and measuring electrical variables, etc., can solve the problems of measurement accuracy reduction, attached noise, etc., and achieve the effect of suppressing the reduction of measurement accuracy

Inactive Publication Date: 2012-01-11
ALPS GREEN DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the current sensor described in the aforementioned Patent Document 1, since signal processing is performed near the magnetic sensor in which the noise environment is serious, when the output signal of the sensor is taken out, noise is attached to the signal line, and there is a problem that the measurement accuracy is lowered.

Method used

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Embodiment Construction

[0034] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0035] figure 1 It is a figure which shows the current sensor concerning embodiment of this invention. In addition, for convenience of explanation, the mounting frame body 3 and the connector side frame body 6 are shown by dotted lines. In this embodiment, figure 1 The illustrated current sensor 1 is a current sensor that outputs an output signal corresponding to a measured current flowing through a current line to a device such as an ECU (Electronic Control Unit). The current sensor 1 includes: a mounting frame 3 mounted on a current line 2 ; and a connector 4 connected to an output destination device via a shielded wire 5 . The connector 4 is connected to the shielded wire 5 through the connector side frame 6 .

[0036] In the mounting frame 3, substrates 11 and 12 are disposed facing each other up and down with the current line 2 interposed therebetween...

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Abstract

The invention provides a current sensor which can prevent a measuring precision decrease due to noise even if in a severely noisy condition. The current sensor (1) in the invention is characterized by comprising a first magnetic sensor (21A) and a second magnetic sensor (21B) which are equipped on the periphery of a current line (2) where the current to be measured flow through and applied for outputting generally reversed output signals by means of the induction magnetic field of the measured current; connectors (4) connected on an electronic device of output objects of the output signals of the first magnetic sensor (21A) and the second magnetic sensor (21B), and a differential part (23) located adjacent to the connectors (4) of the signal lines of the first magnetic sensor (21A) and the second magnetic sensor (21B) and performing differential calculation on the output signals of the first magnetic sensor (21A) and the second magnetic sensor (21B).

Description

technical field [0001] The invention relates to a current sensor for measuring current, in particular to a current sensor capable of reducing electromagnetic noise from external interference. Background technique [0002] In recent years, in the fields of electric vehicles and solar cells, current sensors that measure large DC currents without contact have been widely used due to the increase in the output and performance of electric vehicles and solar cell devices. As such a current sensor, a current sensor including a magnetic sensor that detects a current to be measured flowing through a conductor based on a change in a magnetic field around the conductor has been proposed. Also, as a current sensor, a current sensor that reduces noise from external disturbances has been developed. [0003] As a current sensor that reduces noise from external disturbances, for example, a current sensor that obtains a differential of output signals of two magnetic sensors has been propose...

Claims

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Application Information

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IPC IPC(8): G01R19/00G01R1/18
Inventor 田村学
Owner ALPS GREEN DEVICES