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Measuring AC Mains (220V Voltage- 10A Current) analog output 0-3V

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Antor

Antor

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H-H-Hello there,

Nowadays analog inputs for Microcontrollers and other development boards usually are 0-3V. There are many tools like acsXXX series and LEM sensors. ACS series responds slow for me and LEM is too expensive (for me). Here I'm sharing the schemantics I'm thinking about to implement this week.

Voltage is measured by using voltage divider and current measured by using shunt resistor.

If you think there are better methods or tweaks/tunes for measuring mains please share.

May the force be with you !
 

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  • MainsMeasurement.rar
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  • ACCurrentMeasurement.png
    ACCurrentMeasurement.png
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  • ACVoltageMeasurement.png
    ACVoltageMeasurement.png
    195.1 KB · Views: 176

Hi,

Why not using a energy metering IC.
I know they work with shunts and resistive dividers, but the benefits are
* cheap
* good availability
* good precision
* good datasheets and application notes
* amplifier inside
* analog low pass filtering inside (anti aliasing filter)
* high resolution ADC inside
* oversampling and digital low pass filtering
* true RMS calculation inside
* effective power calculation inside
...
If you are not very experienced you won't get comparable results with selfmade circuit

Klaus
 

@KlausST Thanks mate. I would like to know those IC's you mention. Thanks.
 

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