Llc resonant converter

AC-DC Power Converters
1

I am working on an LLC resonant converter design,
Lm=490µH,
Lr=90µH

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My next step is to design the transformer.Could someone explain:

  1. What type of transformer is typically used after the resonant tank circuit in an LLC converter (UCC256404)?
  2. How are the transformer specifications determined (core type, turns ratio, winding details)?
  3. Are there any standard guidelines or reference methods for calculating turns, core selection, and wire sizing for LLC resonant converter transformers?

My smps is about 240W ,10A, 24V dc output and 240V AC input.

Any detailed explanation or reference material would be greatly appreciated.

Regards.

2

Hi @royal.animator69,

Thank you for posting to the MPS Technical Forum. Are you using an MPS LLC resonant converter for this application? Some of our LLC controllers such as the HR1002A come with excel calculation sheets that you can use to size your transformer for that specific application.