Voltage detecting apparatus that detects voltage of an object
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United States of America Patent
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Aug 12, 2014
Grant Date -
Sep 20, 2012
app pub date -
May 30, 2012
filing date -
Jun 18, 2008
priority date (Note) -
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Abstract
A voltage detecting apparatus detects a detected AC voltage generated in a detected object. The voltage detecting apparatus includes a detection electrode that is disposed facing the detected object, and is capacitively coupled to the detected object. The voltage detecting apparatus also includes a bootstrap circuit that operates using a floating power supply generated with a reference voltage, and outputs a detection signal whose amplitude changes in accordance with an AC potential difference between the detected AC voltage and the reference voltage. The voltage detecting apparatus further includes an insulating circuit that inputs the detection signal and outputs an insulated detection signal that is electrically insulated from the detection signal, and a voltage generating circuit that amplifies the insulated detection signal to reduce the AC potential difference and generate the reference signal.
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