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Interferance/supression capacitors across 230Vac Line on SMPS

Discussion in 'Electronic Components' started by [email protected], Jul 13, 2006.

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  1. Guest

    Any input please. The switchmode i have at the moment completely fails
    it's mains leakage test (using a PAT4 tester) because of residual
    current leakage to earth (through the 0.047uF/275V Wimas) of 4.3mA.
    These capacitors have been in use on the aged SWPS for up to 12yrs
    constantly so is it possible they will have broken down minimally
    (although the 4.3mA is probably acceptable as a leak for this kind of
    application). On the other hand, is there a more prefered type
    supresssion device today, perhaps ex RS Components?. Thanks... pete
  2. Eeyore

    Eeyore Guest

    Yes it will do.

    That's why 2200 or 2700pF is a very popular value for Y caps !

  3. Eeyore

    Eeyore Guest

    In case I wasn't clear - those caps are simply too big.

    If you reduce their value the RFI will be worse but maybe you can live with it ?
    If there's room fit a self-contained filter.

  4. Guest

    Thanx Graham

    Will try some 2200pF and see what their mains leak is and then check
    any RFi issues..
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