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Branch circuit monitor power measurement

  • US 9,335,352 B2
  • Filed: 03/04/2010
  • Issued: 05/10/2016
  • Est. Priority Date: 03/13/2009
  • Status: Active Grant
First Claim
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1. A method of compensating for a phase error when measuring electricity, said method comprising using one or more processors to perform the steps of:

  • (a) sampling an alternating current voltage at a voltage sampling time;

    (b) repeating step (a) at a voltage sampling rate;

    (c) at a current sampling time, sampling a current, said current sampling time temporally independent of said voltage sampling time; and

    (d) determining a phase error compensated voltage corresponding to said current sample, said phase error compensated voltage determined from at least one voltage sample obtained at a time increment offset by a phase error interval from said current sampling time, said phase error interval quantifying a temporal shift of said sampled current relative to said voltage, said temporal shift characteristic of a sensor used to obtain said current sample.

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