• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 62 subscribers
  • Views 420 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Short circuit peak current for inductance design

Florin Ciortea
Prodigy 90 points

Hi,


I am designing an output filter inductor for a 450V output full bridge converter. One of the required parameters for the area product when core saturated approach is used is the peak short circuit current. Is there any analytical method to determine it or any rule of thumb (percentage of the load current, ...). A reference to a technical paper on the subject would be very appreciated!

Also some specs of the designed converter (if one could help):

Vin = 400 V after PFC,

Vout = 450 V

Pout = 4.5 kW

dIL = 2 A (20% load current)

L = 750 uH

Thank you,

Florin!

  • 0
    TI__Mastermind 25570 points
    Hello Florin

    the TI power supply design seminar library at www.ti.com/.../login.shtml has several papers dealing with Magnetic components design - I am sure you will find what you need there.

    It happens that there are many cases where Magnetic components behave non-linearly and operation at peak short circuit condition is one of them. Normally one would use a distributed gap material - powdered Iron for example - and the permeability of these materials reduces gradually as the DC current bias increases. You can avoid the sudden onset of core saturation.

    Most of the materials manufacturers provide design aids - for example the one at www.micrometalsarnoldpowdercores.com/.../inductor-design is fairly typical. TI doesn't endorse any one of these in particular - you need to use your own judgement as to whether the results are satisfactory or not.

    Regards
    Colin