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UC3852: UC3852

Chi Cao
Prodigy 30 points
Part Number: UC3852

how to caculate the loss of inductance in the Boost PFC Circuit.

  • 0
    TI__Expert 3095 points
    Hi Chi Cao,
    I am not quite sure what you mean by 'loss of inductance'. Do you mean the power dissipated in the inductor?
    Is the Boost PFC circuit operating in CCM or transition mode?
    Thanks
    Joe Leisten
  • 0 in reply to Joe Leisten
    Prodigy 30 points
    Yeah，It is the power dissipate in the inductor.I just wanted to know how to caculate it.
    Thanks
  • 0 in reply to Chi Cao
    TI__Expert 3095 points
    Hi Chi Cao,
    Please check out Section 8.2.2.2.1 in the datasheet linked below. This gives a method to compute the RMS current flowing in the Boost inductor. Once this is obtained the power dissipated in the winding can be obtained provided the winding resistance is known. The method presented is for a TM PFC circuit.
    A similar method may be used to estimate the core loss. In other words calculate the flux swing across a switching cycle at angle theta in the Line half-cycle. From this estimate the core loss for that switching cycle using information supplied in the core datasheet. Integrate the result across the Line half-cycle and take the average.
    The result is approximate due to effects like gap loss and proximity loss not included in the estimate.
    Thanks
    Joe Leisten
    www.ti.com/.../ucc28056
  • 0 in reply to Joe Leisten
    Prodigy 30 points

    I get it. Thank you.