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Wall plug power monitor

  • US 8,165,832 B1
  • Filed: 11/12/2008
  • Issued: 04/24/2012
  • Est. Priority Date: 11/12/2008
  • Status: Active Grant
First Claim
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1. 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.

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