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Smps Inductor Loss Reduction

Discussion in 'Electronic Design' started by D from BC, Mar 6, 2007.

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  1. D from BC

    D from BC Guest

    ----Data----
    Circuit: continuous mode smps
    Inductor current: 1.5amps average with 400mA of peak to peak ripple.
    Current ripple waveform: triangle at 100khz
    Rdc: 0.3ohms
    Wire d: 0.6mm
    L: 2.6mH

    I'm not entirely sure about the following:
    Does the proximity effect and skin effect only occur as a result from
    the 400mApp ripple current through the inductor?

    The 1.5A average current through the inductor doesn't affect the AC
    resistance..
    If so...It looks like I can ignore these effects due to I^2Rdc loss
    dominating.

    Therefore, I'm free to fatten up the inductor windings until I get
    close to the AC winding resistance..
    How is this commonly balanced? Is it 50 50?
    (The inductor AC resistance and the DC resistance.)
    D from BC
     
  2. Joerg

    Joerg Guest


    Usually I spec a core that has enough worst case saturation reserves and
    then select a wire gauge that crams it pretty full but not to an extent
    that it makes production difficult.
     
  3. D from BC

    D from BC Guest

    Let's say it's a toroid...
    When you mean full..do you mean multilayer windings for a big fat
    donut? Or full single layer?
    D from BC
     
  4. Joerg

    Joerg Guest


    For switchers in the few hundred kHz class it's often the big fat donut,
    for RF filters it's single layer with an isolation layer on the core.
    Many times switchers will also contain a single layer winding but that
    is because there comes a point when increasing the wire diameter doesn't
    buy you much anymore, other than a hard time soldering it in.
     
  5. D from BC

    D from BC Guest

    Cool...Thanks.. I'll go multilayer on the toroid.
    To reduce Rdc, can I dodge ordering fatter magnet wire by doubling up
    thinner wire (#23) in some way?
    Maybe wind a twisted pair on the toroid? Ill effects?
    D from BC
     
  6. Joerg

    Joerg Guest


    I have doubled up wire without problems on switchers. But not for series
    production as that increases cost.
     
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  8. D from BC

    D from BC Guest

    Now I'm getting spam in a thread I created??
    D from BC
     
  9. Joerg

    Joerg Guest


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