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Do current fed converters suffer from transformer saturation?

Discussion in 'Electronic Design' started by Genome, Apr 8, 2004.

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  1. Genome

    Genome Guest

    I've asked this before and I've still got this worry that they do.

    Fair enogh the buck stage supplies what is a constant current to the
    push-pull or bridge stage but that stage does not differentiate between
    load and magnetising current.

    Isn't it the case that flux walking can still occur if the switching
    times are unbalanced?

    DNA
     
  2. CBarn24050

    CBarn24050 Guest

    The flux and current have a fixed relationship, if 1 is controlled then so is
    the other. In a core where you have flux walking you also have current walking.
     
  3. R.Legg

    R.Legg Guest

    It happens, but they don't 'suffer' as a result.

    The eventual output of the constant current string must feed
    capacitors (~voltage source). The slightest loss in volt-seconds on
    the secondary causes a secondary current imbalance that compensates
    for effects in magnetization of other windings, so long as the load
    current is larger than the magnetizing current - a safe assumption in
    most cases.

    A modest increase in primary conduction loss and magnetizing energy
    (leakage energy) is all that results. These have to be handled anyways
    even in a 'perfect' circuit.

    RL
     
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