Intelligent electronic device having circuitry for highly accurate voltage sensing
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United States of America Patent
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Aug 5, 2014
Grant Date -
Oct 27, 2011
app pub date -
Mar 29, 2011
filing date -
Mar 13, 2008
priority date (Note) -
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Abstract
An intelligent electronic device (IED), e.g., an electrical power meter having circuitry for an input voltage structure with an adjusting voltage divider, resulting in a highly accurate power measurement, is provided. The IED includes a first voltage input for receiving a sensed voltage from a first phase of an electrical distribution system, the first voltage input being coupled to a first voltage divider; a second voltage input for receiving a sensed voltage from a neutral phase of the electrical distribution system, the second voltage input being coupled to a second voltage divider; and an inverting operational amplifier (op amp) coupled to the first and second voltage inputs for providing an output proportional to the voltage of the first phase referenced to the neutral phase, wherein the first voltage divider is adjustable to match a ratio of the first voltage divider to a ratio of the second voltage divider.
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