Energy metering IC

12 October 2011 Analogue, Mixed Signal, LSI

Analog Devices has rolled out an energy metering IC that offers real-time harmonic analysis for energy meters and power quality monitoring equipment. Designed for polyphase meters, the ADE7880 offers complete harmonic analysis, including magnitude and phase information, and delivers better than 1% accuracy over a dynamic range of 2000:1 up to the 63rd harmonic.

The chip is the first to use AD’s proprietary ARTM (adaptive real-time monitoring) harmonic analysis technology, which eliminates the need for custom development of sophisticated digital signal processing and reduces the demands on the system microcontroller. ARTM automatically tracks changes in the fundamental frequency, which eliminates any effects of frequency drift on accuracy of the measurements.

For each harmonic, the IC computes the voltage and current rms, power factor and active, reactive and apparent powers. It also computes the THD+N (total harmonic distortion plus noise) ratio as well as harmonic distortion as a ratio of the fundamental. The ADE7880 delivers active and reactive energy accuracy better than 0,2% over a dynamic range of 5000:1; accuracy better than 0,1% is achieved over a dynamic range of 1000:1 with gain calibration only. The IC incorporates seven sigma-delta ADCs, a digital integrator, voltage reference and all metrology signal processing.

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