Title:
MAGNETIC CURRENT SENSOR AND CURRENT MEASUREMENT METHOD
Document Type and Number:
WIPO Patent Application WO/2014/181382
Kind Code:
A1
Abstract:
A magnetic current sensor having: a Wheatstone Bridge circuit comprising four magneto-resistance elements; a bias magnetic field application means that applies a bias magnetic field to the magneto-resistance elements; and hollow-core coils provided on both sides of the Wheatstone Bridge circuit. The magnetic current sensor is characterized by the Wheatstone Bridge circuit generating a voltage corresponding to an induction field generated by the current to be measured that flows through the hollow-core coils. As a result of this magnetic current sensor and current measurement method, a more compact, lower cost sensor having increased current is possible, as a result of: the excellent linearity between the output voltage and the current in the vicinity of 0 mA as a result of magnetic hysteresis being suppressed; and the excellent insulation properties between the current circuit side and the MR element side.
Inventors:
ZHANG ZHENHONG (JP)
Application Number:
PCT/JP2013/003007
Publication Date:
November 13, 2014
Filing Date:
May 10, 2013
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
G01R15/20
Foreign References:
| JP2005221342A | 2005-08-18 | |||
| JP2006098320A | 2006-04-13 | |||
| JP2009250931A | 2009-10-29 | |||
| JPH0720218A | 1995-01-24 | |||
| JPH06148301A | 1994-05-27 |
Other References:
See also references of EP 2995962A4
Attorney, Agent or Firm:
Fukami Patent Office, p. c. (JP)
Patent business corporation Fukami patent firm (JP)
Patent business corporation Fukami patent firm (JP)
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