Voltage disturbance and harmonics monitor
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United States of America Patent
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May 31, 2011
Grant Date -
Aug 5, 2010
app pub date -
Apr 6, 2010
filing date -
Jun 5, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An electronic monitor for monitoring characteristics of an AC power line for swells, sags, RMS voltage, impulses, total harmonic distortion (THD) and frequency. The waveform is received at the monitor, scaled to a lower magnitude, rectified by an op amp with zero offset voltage, converted a digital form which is representative of the waveform and processed to determine the occurrence of any irregularity in the AC power waveform. Two DMA channels are used to store each cycle, or groups of cycles, of the waveform into two buffers for further processing. An input surge protective circuit limits impulse voltage to the power supply. Related methods are also disclosed.
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