Title:
SENSOR DEVICE
Document Type and Number:
WIPO Patent Application WO/2022/239621
Kind Code:
A1
Abstract:
Provided is a sensor device with which temperature compensation of the sensitivity of a bridge circuit can be performed arbitrarily over a wide sensitivity range. A sensor device 1A comprises a bridge circuit 2, a bias circuit 3, and a detection signal receiving circuit 4. The bridge circuit 2 is configured by bridge-connecting four sensor elements R1, R2, R3 and R4. The bias circuit 3 comprises an oscillation circuit 31 and an averaging circuit 32. The oscillation circuit 31 outputs an oscillating signal V in which an output voltage Vref1 in a first output state and an output voltage Vref2 in a second output state having temperature dependency are repeated alternately with a predetermined ratio. The averaging circuit 32 averages the output voltage of the oscillation circuit 31, and applies the resulting voltage as a bias voltage Vbias to a bias terminal 2a of the bridge circuit 2. By applying this voltage, the bias circuit 3 excites the bridge circuit 2 and cancels out temperature variation of the sensitivity thereof resulting from a change in temperature, thereby compensating for sensitivity temperature characteristics.
Inventors:
TAKASE YASUHIDE (JP)
Application Number:
PCT/JP2022/018493
Publication Date:
November 17, 2022
Filing Date:
April 21, 2022
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
G01R35/00; G01R15/20; G01R17/12; G01R33/02; G01R33/09
Domestic Patent References:
| WO2015146656A1 | 2015-10-01 |
Foreign References:
| JP2006017700A | 2006-01-19 | |||
| JP2017166890A | 2017-09-21 | |||
| JP2002148131A | 2002-05-22 | |||
| US20060250146A1 | 2006-11-09 | |||
| JPH03225223A | 1991-10-04 | |||
| JP2004310584A | 2004-11-04 | |||
| JPH0540847U | 1993-06-01 |
Attorney, Agent or Firm:
MINEGISHI Takeshi (JP)
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