how do i measure the power factor with linear optocouplers type il300?
Posted 05 March 2003 - 07:07 PM
Posted 06 March 2003 - 09:12 AM
Power factor is the raion between KW and KVA and can be less than unity due to the angle between current and voltage, or the presence of harmonics.
If you wish to measure the phase angle between the current and voltage, then use a comparator on the voltage and another one on the current to get two square waves in phase with their source. Use an exclusive OR function on these two square waves and you will get a pulse stream that is proportional to the angle between the current and voltage. This can be applied to the opto coupler.
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