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Optocoupler 220 VAC sense

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leonardo0

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220 to optocoupler

Hi

I need to design a circuit to read ,measure the 220 V mains voltage.
I saw one design note where the author was using one 150 V zener plus one resistor to limit current to the optocoupler .Mains voltage was measured by measuring the period the output from the optocoupler was low during the positive semi-period . He also had a diode to protect from reverse biasing the input emmiting diode . I imagine that during the negative semi-period the current would flow from the protection circuit so i see power issues .Has anybody experienece and can give me a simple solution or any schematics etc?
 

hakeen

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A good device from Avago to sense both AC and DC. The output is digital.



Regards
Hakeen
 

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