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9th January 2013, 16:46 #1
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Converting 0  240AC voltage to 0  5 Dc voltage
Hey everyone i want to measure current and voltage using Pic16f877a for my final year project 'Non intrusive load monitoring system'. I want a simple circuit to convert ac voltage range from 0  240 to dc voltage 0  5v.... if anyone have proteus simulation and code please share :) Thanks

9th January 2013, 16:46

9th January 2013, 16:50 #2
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Re: Converting 0  240AC voltage to 0  5 Dc voltage
Its possible on several ways, such as voltage divider, hall sensor for voltage, prim/sec transformer.
But is there is purpose of measuring 0240V? Usually voltage oscillations are monitored let say between 160V  270V.“Let the future tell the truth, and evaluate each one according to his work and accomplishments. The present is theirs; the future, for which I have really worked, is mine.” Nikola Tesla

9th January 2013, 16:56 #3
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Re: Converting 0  240AC voltage to 0  5 Dc voltage
well measuring fluctuation between 160v to 270v would be ok too ...

9th January 2013, 16:56

9th January 2013, 16:57 #4
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Re: Converting 0  240AC voltage to 0  5 Dc voltage
For current you can use CT Current Transformer, and also Hall sensors.
“Let the future tell the truth, and evaluate each one according to his work and accomplishments. The present is theirs; the future, for which I have really worked, is mine.” Nikola Tesla

9th January 2013, 16:59 #5
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Re: Converting 0  240AC voltage to 0  5 Dc voltage
main idea is to measure a current from main power supply of buidling...

9th January 2013, 17:04 #6
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Re: Converting 0  240AC voltage to 0  5 Dc voltage
What current range ?
You can see ACS712 hall sensor. Can measure current of both AC and DC.
There is three variants for 5A 20A and 30A, all three can measure negative and positive voltages.
Output from IC is prepared for uC ADC.
Example for ACS71220 (20A) :
0,5V is 20A
2,5V is 0V
4,5V is +20A
ACS712 is very cheap, but current must flow through it.
But my opinion for safety that is better to use current transformer for this, or hall sensor without direct interruption of wires.
Hall sensor without wire interruption:
Current Transformer also without wire interruption :
Last edited by tpetar; 9th January 2013 at 17:14.
“Let the future tell the truth, and evaluate each one according to his work and accomplishments. The present is theirs; the future, for which I have really worked, is mine.” Nikola Tesla

9th January 2013, 17:04

9th January 2013, 17:13 #7
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Re: Converting 0  240AC voltage to 0  5 Dc voltage
here's one obvious and simplistic method.
http://www.falstad.com/circuit/#%24+...573E4+0+1%0A
extremely linear, extremely accurate, extremely cheap, extremely simple to implement. Why bother with anything else ?
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