Patent ID: 6417792
Filing Date: 2002-07-09
Classification: G01R

Abstract:
An analog-to-digital converter system comprising:first and second delta sigma analog-to-digital converters respectively configured to receive first and second input signals respectively indicative of electric current and voltage values, said first and second delta sigma analog-to-digital converters being configured to convert input analog signals into corresponding digital signals and said first and second delta sigma analog-to-digital converters include a fourth order delta sigma modulator and a second order delta sigma modulator; a calculation engine for receiving digital representations of said first and second input signals from said first and second delta sigma analog-to-digital converters and for performing selected operations on said digital representations such that said current and voltage values are combined, and a serial interface connected to said calculation engine; wherein the first and second delta sigma analog-to-digital converters, the calculation engine, and the serial interface are fabricated on a single semiconductor chip and the calculation engine is configured to calculate energy, power, rms current and voltage for single phase 2 or 3 wire power quality measurements.