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Power in flyback converter

Discussion in 'Electronic Design' started by Hammy, Feb 21, 2008.

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  1. Hammy

    Hammy Guest

    I'm trying to take efficiency measurements on a 10.5W Flyback with
    what I have available (DSO and DMM). The best method I can think of is
    uploaded to "alt.binaries.schematics.electronic " in pdf format.

    File name Flyback.pdf (60Kb)

    I also compared my measurements with the $20 killAwatt meter. For a
    twenty dollar meter it's not too bad. This of course assumes my
    measurements and calculations are correct. I'm sure someone will point
    out any errors ;)

    The measurements were done with the flyback delivering 5.72W into a
    resistive load. Largest power resistors available until tomorrow.
     
  2. D from BC

    D from BC Guest

    There's the crazy calorimetic method. :p
    Example:
    http://honolulu.hawaii.edu/distance/sci122/Programs/p21/image.gif

    I do efficiency estimates in spice.
    Core loss by software.


    D from BC
    British Columbia
    Canada.
     
  3. Hammy

    Hammy Guest

    Yes I've heard of it Ridley and Dixon reference it in there
    publications. I'm under crippling economic constraints though what
    with the price of water, wood, and air and not to mention complexity;
    the method is out of reach;)
    What do you do stick one finger on the DCbus and one finger in the
    water and get the coroner to measure the splatter pattern of your
    heart?:)
    Yes spice can give reasonably accurate results if you take the time to
    model all components and trace parasitics factor in tolerances
    temperature dependences etc. but I still prefer to actually measure. I
    wouldn't rely on it solely, any analytical method spice are manual
    calculation gives theoretical results which should be tested and
    verified by measurement under worst case conditions. Failure to do so
    can result in some embarrassing and expensive situations .Exploding
    laptops comes to mind.

    Those measurements seem accurate enough when compared to spice and
    manual calculations and the killawatt. Not so critical for this 10.5W
    but for the 70W flyback and 200W forward converter I should be able to
    use it for reasonably accurate results. Or at least good enough I can
    be sure my fuse, cap, bridge, CM choke and SMPS core are properly
    sized.

    Thanks
     
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