Patent ID: 6781361
Filing Date: 2004-08-24
Classification: G01R

Abstract:
A power metering measurement system comprising:a first modulator receiving a first analog voltage associated with a current and outputting a first digitized signal; a second modulator receiving a second analog voltage and outputting a second digitized signal; a first lowpass filter filtering out high frequency noise associated with said first digitized signal and decimating the frequency of said first digitized signal, said first lowpass filter outputting a first filtered signal; an interpolator receiving a signal associated with said first filtered signal and performing up sampling of said signal associated with said first filtered signal, said interpolator outputting a first up sampled signal; an integrator integrating said up sampled signal and outputting an integrated signal, said integrator also compensating for phase errors introduced to said first up sampled signal and said integrator; and a first multiplier multiplying said second digitized signal and integrated signal and outputting a multiplied signal, said multiplied signal being used to measure power.