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  1. #1
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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?

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  2. #2
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  3. #3
    Full Member level 5
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    Re: Optocoupler 220 VAC sense

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

    http://www.avagotech.com/products/pr...9,C4982,P88908

    Regards
    Hakeen



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