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Voltage ripple

Discussion in 'Electronic Basics' started by Hammy, Mar 30, 2008.

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  1. Hammy

    Hammy Guest

    I'm measuring the output ripple on my flyback (60 kHz @10W). I'm using
    2 polymer aluminum caps 16V 470uf 9mohm 100 kHz ESR. The peak
    secondary current is 5 Amps full load this should give about 35mV
    ripple. I'm measuring 140mVpp ripple on the output. I'm not using the
    ground lead from my probe but the small wire; I'm also taking the
    measurement right in the terminal blocks. Is the spike just RF pickup
    from the leads? I've tried bypassing it with leaded ceramic caps based
    on an FFT with limited success.

    Any suggestions?

    Heres a capture of the scope measurements.
    CH1 is the output ripple CH2 is the current sense signal.

    http://i29.tinypic.com/1493upl.jpg

    Thanks
     
  2. Phil Allison

    Phil Allison Guest

    "Hammy"
    ** OK - so far.

    ** Huh ??

    Try using a co-axial cable ( with BNC on one end) instead of a scope probe.

    Might lose that RF glitch altogether then.



    ...... Phil
     
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