CAPACITIVE SENSOR

WIPO Patent Application WO/2018/042528

A1

This capacitive sensor is provided with: a CV conversion circuit that is provided with first and second detection capacitors and first and second feedback capacitors and obtains a voltage based on the capacitance values of the first and second feedback capacitors, an AD converter that carries out analog-to-digital conversion on an input voltage so as to obtain a digital signal, a digital control unit for receiving the digital signal, and first and second digitally controlled variable capacitors that have the capacitance values thereof controlled by the digital control unit. When a physical quantity to be measured is not essentially zero, the capacitance values of the first and second detection capacitors vary, according to the physical quantity, from the capacitance values when the physical quantity is essentially zero. The amounts of variation of the capacitance values of the first and second detection capacitors have opposite signs and essentially the same absolute values. The first and second feedback capacitors accumulate charges that reflect the capacitance values of the first and second detection capacitors and the first and second digitally controlled variable capacitors. The capacitive sensor controls the common phase voltage level of the input or output voltage of the CV conversion circuit through the control of the first and second digitally controlled variable capacitors.

FURUBAYASHI YUKI (JP)
OSHIMA TAKASHI (JP)
TAKAHASHI MAKOTO (JP)

PCT/JP2016/075388

March 08, 2018

August 31, 2016

Click for automatic bibliography generation  

HITACHI LTD (JP)

G01P15/125; G01D5/241

JP2015135245A	2015-07-27
JP2014529972A	2014-11-13
EP2653846A1	2013-10-23
US20060213270A1	2006-09-28
JPH0972757A	1997-03-18

SEIRYO I.P.C. (JP)

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