Noncontact voltage measurement apparatus
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United States of America Patent
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Apr 9, 2019
Grant Date -
Jan 18, 2018
app pub date -
Sep 28, 2017
filing date -
Apr 28, 2015
priority date (Note) -
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Abstract
A noncontact voltage measurement apparatus includes a sensing electrode to which a voltage corresponding to an alternating current voltage is applied, a feedback electrode, a conductive movable body that is supported so as to be displaceable in accordance with the Coulomb force generated between the movable body and the sensing electrode and the Coulomb force generated between the movable body and the feedback electrode, an elastic force for causing the movable body to return to a predetermined neutral position acting on the movable body, a displacement detection unit configured to detect a displacement of the movable body, a voltage applying unit configured to apply an alternating current voltage to the feedback electrode, and a control unit configured to control the voltage to be output from the voltage applying unit such that a detection result of the displacement from the displacement detection unit approaches a predetermined reference value.
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