PULSE WIDTH MODULATED VOLTAGE MEASURING CIRCUIT AND METHOD
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United States of America Patent
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Issued Date -
Jun 20, 2013
app pub date -
Aug 17, 2012
filing date -
Dec 19, 2011
priority date (Note) -
Abandoned
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Abstract
A voltage measuring circuit includes a rectifier to receive an alternating current (AC) voltage to be measured and to provide a rectified output; a comparator for comparing the rectified output and producing therefrom a square wave having a pulse width indicative of the rectified output exceeding a threshold; a calculation circuit for converting a measurement of the pulse width into a measurement of the voltage and optionally an opto-isolator interconnecting the comparator to the calculation circuit. The rectifier may provide operating power to the comparator and an input side of the opto-isolator, from the AC voltage signal being measured. The remainder of the measuring circuit may powered by a source isolated from the voltage to be measured.
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