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Power factor measurement

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Thread Starter

laurence6202

Joined Sep 18, 2013
1
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
 
crutschow

crutschow

Joined Mar 14, 2008
34,408
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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