Root mean square (RMS) metering devices and methods for generating RMS current level to both high or low frequency within signal
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United States of America Patent
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Apr 30, 2013
Grant Date -
Apr 29, 2010
app pub date -
Oct 26, 2009
filing date -
Oct 29, 2008
priority date (Note) -
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Abstract
Embodiments of the present invention provide systems, devices and methods for efficiently calculating a true RMS values (either voltage or current) of an AC signal. The RMS value is generated from both high and low frequency components of the AC signal without a high speed ADC being integrated within the system. The high frequency component is processed by calculating an average current waveform of the high frequency component and approximating a corresponding RMS value using a waveform factor. The waveform factor is effectively a scalar that relates the average current waveform of the high frequency component to an appropriate RMS value.
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