CURRENT MEASUREMENT DEVICE - ALPS GREEN DEVICES CO LTD

Title:

CURRENT MEASUREMENT DEVICE

Document Type and Number:

WIPO Patent Application WO/2011/111459

Kind Code:

A1

Abstract:

Disclosed is a current measurement device that can detect detected current with high sensitivity and high accuracy, and can be made more compact and with a simpler configuration: a current measurement device—which is equipped with: a plurality of GMR elements (12-1 to 12-N) each provided with a fixed magnetic layer (18) having a fixed direction of magnetization and a free magnetic layer (20) having a direction of magnetization that varies by an outside magnetic field; and a computation unit (21) that determines the magnitude of the detected current from the outputs of the plurality of GMR elements (12-1 to 12-N)—wherein the plurality of GMR elements (12-1 to 12-N) are disposed in a ring around the periphery of the conductor (13) through which the detected current flows, and the plurality of GMR elements (12-1 to 12-N) are electrically connected in a manner so as to configure a series variable resistor.

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Inventors:

HAYASHI NOBUHIRO (JP)
KOGURE TATSUYA (JP)
TAKAHASHI AKIRA (JP)

Application Number:

PCT/JP2011/052662

Publication Date:

September 15, 2011

Filing Date:

February 08, 2011

Export Citation:

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Assignee:

ALPS GREEN DEVICES CO LTD (JP)
HAYASHI NOBUHIRO (JP)
KOGURE TATSUYA (JP)
TAKAHASHI AKIRA (JP)

International Classes:

G01R15/20

Foreign References:

JPS63253264A	1988-10-20
JP2005529338A	2005-09-29
JPH09503297A	1997-03-31
JP2007107972A	2007-04-26
JP2010056152A	2010-03-11

Other References: