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  1. #1
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    Earth leakage current in offline smps

    Hello,
    Is the earth leakage current in this PSU a little high at 500uA?

    https://www.xppower.com/portals/0/pdfs/SF_ASB110.pdf

    What might be causing this much leakage?

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    Re: Earth leakage current in offline smps

    Y-capacitors?


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    Re: Earth leakage current in offline smps

    Thanks, but that would not be classified as "leakage"?



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    Re: Earth leakage current in offline smps

    Hi,

    How else do you call it?
    The Y capacitors may/will cause (additional) current on the Earth wire (to keep HF EMI voltage noise low).
    And even at line frequency they cause current. Unwanted current.

    Klaus
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    Re: Earth leakage current in offline smps

    Thanks, but that would not be classified as "leakage"?
    Of course Y capacitor current is classified leakage. Leakage regulations are the most important restriction when choosing Y capacitor size for mains filters.



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    Re: Earth leakage current in offline smps

    The "Y capacitor current" we would say is the normal capacitive current and is V/Z.

    "Leakage" current in a capacitor, pertains, i thought, to "bad current"...due to the imperfection of the capacitor manufacture?



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    Re: Earth leakage current in offline smps

    Hi,

    Let's say the equivalent to "leakage current" here is "unwanted current"... current not necessary for the function.

    For a capacitor the leakage current is the "self discharge current".
    For an SMPS the Earth current is the unwanted = leakage current.

    Klaus
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    Re: Earth leakage current in offline smps

    Thanks, sorry i thought you were going to say ....
    "For an SMPS the Earth current is the unwanted = leakage current, plus the capacitive current." ?



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