Root mean square (RMS) metering devices and methods for generating RMS current level to both high or low frequency within signal
US8433743B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 2009 |
| Grant date | Apr 30, 2013 |
| Priority date | — |
| Expiry date | Nov 28, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R29/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.