Patent ID: 8165832

Claim:
A device, comprising: an Analog-to-Digital Converter (ADC) that provides digital voltage samples representative of an AC voltage signal, and that provides digital current samples representative of an AC current signal; a current sense resistor having a resistance of less than ten milliohms, wherein the AC current signal flows across the current sense resistor; a Zero-Crossing Comparator (ZCC) that detects a beginning and an end of a voltage data sampling period and that detects a beginning of a current data sampling period; a Timer (TMR) operable to time a plurality of voltage data sampling periods and a plurality of current data sampling periods; and a processing circuit operable to receive from the ADC a plurality of the digital voltage samples representative of a peak voltage during each of the plurality of voltage data sampling periods and to receive from the ADC a plurality of the digital current samples representative of a peak current during each of the plurality of current data sampling periods.