Title:
CURRENT SENSOR
Document Type and Number:
WIPO Patent Application WO/2012/035906
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a current sensor which can reduce the influence of magnetic disturbances and suppress a drop in current measuring accuracy, when using a magnetic sensor element, such as a GMR element, which has sensitivity in the direction orthogonal to the sensitive axis. This current sensor (1) is equipped with: a pair of magnetic sensors (12a, 12b) which are arranged around an electric wire (11) through which the current being measured flows, and which output a reversed phase output signal by means of the induction field from the current flowing through the electric wire (11), and which each have sensitivity in the direction orthogonal to the sensitive axis; and a calculation device (13) which is connected to the pair of magnetic sensors (12a, 12b), and which carries out a differential calculation on the output signals from the pair of magnetic sensors (12a, 12b). The current sensor (1) is characterised in that the magnetic sensors (12a, 12b) are arranged such that the non-sensitive axes thereof face in the direction of the induction field from the current flowing through an electric wire (adjacent electric wire (21)) which is adjacent to the electric wire (11).
Inventors:
HEBIGUCHI HIROYUKI (JP)
Application Number:
PCT/JP2011/067889
Publication Date:
March 22, 2012
Filing Date:
August 04, 2011
Export Citation:
Assignee:
ALPS GREEN DEVICES CO LTD (JP)
HEBIGUCHI HIROYUKI (JP)
HEBIGUCHI HIROYUKI (JP)
International Classes:
G01R15/20
Domestic Patent References:
| WO2006090769A1 | 2006-08-31 |
Foreign References:
| JP2009162499A | 2009-07-23 |
Attorney, Agent or Firm:
AOKI, Hiroyoshi et al. (JP)
Hiroyoshi Aoki (JP)
Hiroyoshi Aoki (JP)
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Claims: