[PIC] Power factor measurement logic & program using PIC 16F877A

[Shreedhar Bhat]

I need a help.. Power factor measurement logic & program using PIC 16F877A..

My project is to automatic power factor controller,
My approach is to find out the zero crossing of both Current and Voltage,
find out the time difference and then calculate the angle..

Please elaborate this logic step by step..
*How to calculate angle using time difference?
& help me for coding..


Thank you..

 

[milan.rajik]

https://www.edn.com/design/analog/4...g-detector-uses-only-a-few-high-voltage-parts

https://www.edn.com/design/power-ma...ent-count-zero-crossing-detector-is-low-power

https://www.youtube.com/watch?v=-yZEUIGF7ZM

https://www.electro-tech-online.com/threads/current-zero-crossing-detector.7849/

 

[Shreedhar Bhat]

https://www.edn.com/design/analog/4...g-detector-uses-only-a-few-high-voltage-parts

https://www.edn.com/design/power-ma...ent-count-zero-crossing-detector-is-low-power

https://www.youtube.com/watch?v=-yZEUIGF7ZM

https://www.electro-tech-online.com/threads/current-zero-crossing-detector.7849/

Malik sir.. I need program logic.. I'm not getting accurate answer for my logic..

So.. please..

Thank you..

 

[milan.rajik]

Where is your code?

 

[Shreedhar Bhat]

Re: Power factor measurement logic & program using PIC 16F877A

Where is your code?

Flowcode..

- - - Updated - - -

How to measure phase difference between Voltage & current using pic 16F877A.?
Please help me..

Thank you..

 

[Amin Khorsandi]

I highly recommend you to change your idea about measuring the PF. the zero crossing detection and phase calculating is not appropriate for non-linear consumers. for example if you want to calculate a switching power supply PF, you cant do it because the current shape in not a sine wave and your measurement will be incorrect.
the best way is to calculate apparent and effective power and calculate PF by dividing them.
that's the thing I did in the same project in my company.

 

[Shreedhar Bhat]

Finally i did the flowcode for phase angle calculation..

I have phase_angle.. I need cos(phase_angle)..
How to get cos function in attached file.?. please help me..View attachment phase_lag_calculation.rar

 

[milan.rajik]

Flowcode PIC doesn't have trigonometric functions. You have to implement it.