Power factor measurement

Discussion in 'General Electronics Chat' started by laurence6202, Oct 9, 2013.

  1. laurence6202

    Thread Starter New Member

    Sep 18, 2013
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    0
    Any links or ideas for a circuit to measure power factor. I have a voltage and current transformer and have very basic knowledge of circuits.
    Thanks
    Laurence
     
  2. crutschow

    Expert

    Mar 14, 2008
    12,991
    3,227
    You convert the voltage and current signals to a square wave using comparators with a 0V reference (zero crossing detection). Then you use a microprocessor to calculate the difference in time between the two zero crossings of the waveforms (based upon the frequency of the waveforms) and then the power factor value from that.

    Or you could use a dedicated power measurement chip which includes a power factor output such as one of these.
     
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