Title:
CURRENT SENSOR
Document Type and Number:
WIPO Patent Application WO/2021/084801
Kind Code:
A1
Abstract:
[Problem] To reduce a detection error caused by a change of current division ratio in a current sensor structured so that a bus bar is branched into a sensing unit and a bypass unit. [Solution] Provided is a current sensor 1 comprising: a bus bar 10 by which current to be measured I is divided for a sensing unit 13 and bypass units 11, 12; a magnetic sensor 20 that detects a magnetic field generated by current flowing in the sensing unit 13 of the current to be measured I; a resistance pattern 31 arranged in the sensing unit 13; a resistance pattern 32 arranged in the bypass unit 11; and a correction circuit 30 that corrects an output value of the magnetic sensor 20 on the basis of changes in resistance values of the resistance patterns 31, 32. In this way, because the output value of the magnetic sensor 20 is corrected on the basis of the changes in resistance values of the resistance patterns 31, 32, even when current division ratio is changed due to a temperature difference between the sensing unit 13 and the bypass units 11, 12, a measurement error caused by this change is cancelled.
Inventors:
LO ADRIAN (JP)
KAMI MASAFUMI (JP)
HIRABAYASHI JUN (JP)
KAMI MASAFUMI (JP)
HIRABAYASHI JUN (JP)
Application Number:
PCT/JP2020/026191
Publication Date:
May 06, 2021
Filing Date:
July 03, 2020
Export Citation:
Assignee:
TDK CORP (JP)
International Classes:
G01R19/00; G01R15/20
Domestic Patent References:
| WO2018092336A1 | 2018-05-24 |
Foreign References:
| JP2002202328A | 2002-07-19 | |||
| EP1028321A2 | 2000-08-16 |
Attorney, Agent or Firm:
WASHIZU Mitsuhiro et al. (JP)
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