Patent ID: 6370483
Filing Date: 2002-04-09
Classification: G01R

Abstract:
A method for using first and second microprocessors to measure and process phasors of three phase AC waves, the method consisting of the steps of:a) storing tables of values of sine and cosine functions in said first microprocessor, b) sending positive rectified half cycles of said AC waves to unipolar analog to digital converter (ADC) inputs provided by said first microprocessor, c) forming square waves from said AC waves with first levels indicating positive half cycles and second levels indicating negative half cycles of said waves, d) applying said square waves to binary input inputs provided by said first microprocessor, e) combining results from said ADC with logic levels produced by said binary inputs in forming sums of the products of digital samples from said ADCs and values taken from said tables of values thereby measuring phasors of AC waves.