Title:
CURRENT SENSOR
Document Type and Number:
WIPO Patent Application WO/2014/147996
Kind Code:
A1
Abstract:
Disclosed is a current sensor provided with a magnetic-field generation unit (30), a sensor element (40) that has a plurality of magnetoresistive elements (41 through 48), an output-computation circuit (54), and a self-diagnostic circuit (55). The magnetic-field generation unit (30) generates a second magnetic field in a direction perpendicular to a first magnetic field. The sensor element (40) outputs a sine-wave signal and a cosine-wave signal that represent the sine and the cosine, respectively, of the angle (θ) between the second magnetic field and a composite magnetic field comprising the first and second magnetic fields. The output-computation circuit (54) outputs a sensor signal corresponding to the magnitude of a detected current. The self-diagnostic circuit (55) uses the aforementioned sine-wave and cosine-wave signals to determine whether the sensor element (40) is malfunctioning.
Inventors:
NOMURA KOUSUKE (JP)
Application Number:
PCT/JP2014/001364
Publication Date:
September 25, 2014
Filing Date:
March 11, 2014
Export Citation:
Assignee:
DENSO CORP (JP)
International Classes:
G01R15/20
Foreign References:
| JP2008134215A | 2008-06-12 | |||
| JP2007155399A | 2007-06-21 | |||
| JP2012137457A | 2012-07-19 | |||
| JP2006105932A | 2006-04-20 |
Attorney, Agent or Firm:
KIN, Junhi (JP)
Gold Junki (JP)
Gold Junki (JP)
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