Intelligent electronic device having circuitry for noise...

Details Intelligent electronic device having circuitry for noise... Intelligent electronic device having circuitry for noise...

2011-03-29

2011-03-29

Jeanglaude, Jean B (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C341S156000

Reexamination Certificate

active

07916060

ABSTRACT:
An intelligent electronic device (IED), e.g., an electrical power meter, having circuitry for an input structure of an analog-to-digital converter (ADC) that reduces noise of a signal from a sensor in the device, resulting in a highly accurate power measurement, is provided. The circuitry includes a first single-ended analog-to-digital converter with an input from a voltage signal and a second single-ended analog-to-digital converter with an input that is the reference voltage used by the voltage signal. A programmable device subtracts the digital output of the second single-ended analog-to-digital converter from the digital output of the first single-ended analog-to-digital converter to produce a digital result of the voltage signal that is free from common-mode noise.

REFERENCES:
patent: 6423960 (2002-07-01), Engelhardt et al.
patent: 6444971 (2002-09-01), Engelhardt et al.
patent: 6674379 (2004-01-01), Li et al.
patent: 7372574 (2008-05-01), Sanders et al.

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