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tigrou
tigrou
10:22 AM
In a LLC resonant converter (ex: i.imgur.com/Wna51DC.png), why the Lm inductor (in parallel with the transformer) improve overall performance of the circuit (vs a LC circuit) ? AFAIK adding a inductor in parallel of another one will lower the overal inductance.
 
tigrou
tigrou
11:19 AM
That helped :
https://www.eetimes.com/llc-resonant-topology-lowers-switching-losses-boosts-efficiency/#

"The main difference is that in the series resonant converter the primary inductance of the transformer was so great as to not factor in the characteristics of the resonant network. However, in the LLC converter the primary inductance of the transformer is reduced in value such that it now impacts the resonant network."
 

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