CURRENT DETECTION DEVICE AND CORRECTION FACTOR CALCULATION METHOD

WIPO Patent Application WO/2017/119092

A1

[Problem] To provide a current detection device and correction factor calculation method whereby a current flowing through a bus bar covered with a magnetic shield can be detected with high accuracy. [Solution] A current detection device 1 is provided with: a plurality of bus bars 2; a plurality of magnetic detection elements 3 which are arranged respectively in correspondence to the plurality of bus bars 2, and which output voltages corresponding to the strength of magnetic fields generated by currents flowing through the bus bars 2; a magnetic shield 5 arranged to surround parts of the bus bars 2 and the respective magnetic detection elements 3; a correction factor calculation unit 62 which, on the basis of the voltages output by the plurality of magnetic detection elements 3 when two or more arbitrarily defined bus bars 2 of the plurality of bus bars 2 are supplied with inversely phased currents, calculates correction factors for correcting mutual interference between the plurality of magnetic detection elements 3; a correction factor storage unit 7 which stores the correction factors calculated by the correction factor calculation unit 62; and a current calculation unit 61 which, using the correction factors stored in the correction factor storage unit 7, calculates the currents flowing through the plurality of bus bars 2 on the basis of the output voltages of the plurality of magnetic detection elements 3.

FUTAKUCHI NAOKI (JP)
AKIMOTO KATSUYA (JP)

PCT/JP2016/050302

July 13, 2017

January 07, 2016

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HITACHI METALS LTD (JP)

G01R15/20; G01R19/00

WO2014080526A1

2014-05-30

JP2008504546A

2008-02-14

HIRATA, Tadao (JP)

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