Microcontroller Based Power Factor Meter

[ec_robo06@yahoo.co.in]

Hi.....
I Want To Ask Abt 89c51 Based Power Factor Meter...
The Question Is Hw To Compare Leading Or Lagging Time Between Voltage &current Which May Be Derived From The Power System At Any Point?????????????

 

[Papabravo]

You use an A/D converter to sample the current and voltage waveforms. The values uniquely determine the phase. The phase difference is calculated and the cosine of the phase difference is the PF

 

[Oznog]

Here are the 2 tricky parts:
1. Powering the uC. You may want to avoid a bulky transformer but your options are limited.
2. Isolating the system. In some cases- all plastic case, rubber buttons, no output ports- this isn't necessary. But that might somewhat limit your features.

Simple leading and lagging can be calculated from zero crossings. But if you're gonna do it on a micro you might as well go all the way and calculate it across the sum of the waveform, calculate RMS current, THD, etc.

 

[rshafi68]

ups

dear friend!


i want to make a ups .could u plz give me the schematic diagram of ups using microcontrollor 89c51.

 

[Paul Obrien]

I'm presently building up a kit project which uses an ADE7756AN as the power gathering data device.

 

[rajengineer]

Power factor controller

dear all,

good day,

please help me in phase angle finding between voltage and current.

I read a/d converter is find the phase angel and then phase angle multiply cos than we can get it but i don't know how to work.

I want to make one power factor correction controller for my project.

PLEASE MAIL ME IN RAJENGINEER@YMAIL.COM

Thank you,

raj

 

[be80be]

You all may want to read this if you can use a pic. They have some read good code to get you started too.

**broken link removed**