Title:
MAGNETIC SENSOR DRIVE CIRCUIT, MAGNETIC SENSOR, CURRENT SENSOR, AND METHOD FOR DRIVING MAGNETIC SENSOR
Document Type and Number:
WIPO Patent Application WO/2015/008835
Kind Code:
A1
Abstract:
A magnetic sensor drive circuit that measures a magnetic field by passing a feedback current, which cancels out changes in magnetic flux density from the measured magnetic field, through a prescribed coil, said drive circuit comprising: a first circuit block which carries the feedback current by using an external power supply as a power supply; a second circuit block which has an output adjustment circuit for monitoring the voltage of the power supply, adjusting a signal corresponding to the strength of the feedback current to be a signal proportional to the voltage of the power supply, and outputting the adjusted signal; a first power supply line which supplies the external power supply to the first circuit block; a second power supply line which supplies the external power supply to the second circuit block in parallel with the first power supply line; a first low pass filter inserted in the first power supply line; and a second low pass filter inserted in the second power supply line.
Inventors:
GOHARA MIYAKO (JP)
OHMORI KENICHI (JP)
OHMORI KENICHI (JP)
Application Number:
PCT/JP2014/069058
Publication Date:
January 22, 2015
Filing Date:
July 17, 2014
Export Citation:
Assignee:
FUJIKURA LTD (JP)
International Classes:
G01R33/02; G01R19/00
Foreign References:
| JPH03150485A | 1991-06-26 |
Attorney, Agent or Firm:
SHIGA Masatake et al. (JP)
Masatake Shiga (JP)
Masatake Shiga (JP)
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