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Patent Searching and Data


Title:
CURRENT SENSOR AND METHOD FOR MANUFACTURING CURRENT SENSOR
Document Type and Number:
WIPO Patent Application WO/2019/069499
Kind Code:
A1
Abstract:
Provided is a method for manufacturing a current sensor that detects a current on the basis of a magnetic field generated by a to-be-detected current. This method includes: a step for preparing a current sensor (1); a step (ST1) for applying an in-phase magnetic field (Bc) to the current sensor; and a step (ST2) for adjusting gain. The current sensor is provided with: first and second magnetic sensors that sense magnetic fields (B1, B2) having mutually reversed phases in accordance with a current (I); and an output unit. The output unit calculates a differential amplification between the sensing result of the first magnetic sensor and the sensing result of the second magnetic sensor, and generates an output signal that indicates the detection result of a current. The in-phase magnetic field is inputted in phase to the first magnetic sensor and the second magnetic sensor. In the step for adjusting gain, the gain of the signal in the current sensor is adjusted, in accordance with the in-phase magnetic field, such that the amounts of two signals, on which differential amplification is performed by the output unit as the sensing results of the first and second magnetic sensors, are equal to each other.

Inventors:
TAKATA, Masaaki (10-1, Higashikotari 1-chome, Nagaokakyo-sh, Kyoto 55, 〒6178555, JP)
SHIMIZU, Yasuhiro (10-1, Higashikotari 1-chome, Nagaokakyo-sh, Kyoto 55, 〒6178555, JP)
KISHI, Noritaka (10-1, Higashikotari 1-chome, Nagaokakyo-sh, Kyoto 55, 〒6178555, JP)
Application Number:
JP2018/017864
Publication Date:
April 11, 2019
Filing Date:
May 09, 2018
Export Citation:
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Assignee:
MURATA MANUFACTURING CO., LTD. (10-1, Higashikotari 1-chome Nagaokakyo-sh, Kyoto 55, 〒6178555, JP)
International Classes:
G01R15/20; G01R19/00
Domestic Patent References:
WO2016194240A12016-12-08
WO2012050048A12012-04-19
Foreign References:
JP2007078418A2007-03-29
JP2013196861A2013-09-30
JP2002333456A2002-11-22
JP2009281772A2009-12-03
JP2015152363A2015-08-24
JP2002071773A2002-03-12
JPH07294561A1995-11-10
US5570034A1996-10-29
US20090021249A12009-01-22
Attorney, Agent or Firm:
YAMAO, Norihito et al. (AOYAMA & PARTNERS, Umeda Hankyu Bldg. Office Tower 8-1, Kakuda-cho, Kita-ku, Osaka-sh, Osaka 17, 〒5300017, JP)
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