Power factor to voltage conversion circuit diagram

[ghaste.siddhartha]

Hi All,
Please tell me how to convert power factor to voltage.

 

[KlausST]

Hi,

what input signals?
3 phase, single phase?
sinusoidal shape or any shape?
linearity, precision?
What input voltages and what output voltage?
purely analog design, or with ADC and ucontroller?

Klaus

 

[ghaste.siddhartha]

Hi,
Voltage and Current, single phase, sinusoidal shape, output from 0V for 0.5 lead to 5V for 0.5 lag,purely analog design

 

[KlausST]

Hi

No linearity needed...

Then you simply can use two comparators with threshold at 0V.

XNOR both signals.

Lowpass filter the XNOR output
Levels of 0V up to 2.5V are valid
0V: cos(phi) = 1, 0 degree
2.5V: cos(phi) = 0, 90 degree

The output is linear to degrees phase shift. 0 to 90 degree. Not linear to cos(phi).

Klaus