Hello,

I am studying some about series resonant converter but stuck to understand one thing from DC gain-frequency graph.

The circuit:

DC gain to frequency plot:

They say:
"As the load decreases, the Q decreases and the result is that the frequency needs to increase significantly to keep the output regulated."

I have problem to understand this.
Assuming that my converter have LEDs as a load looking on equation Q=Z/R if the load decreases the Q increases and then I have to do nothing with frequency because if number of LEDs is lower so DC gain can also be lower.
Is that right? Thanks in advance.

 

A LLC converter has a higher frequency for a light load and a lower frequency for a higher load.
At least that's how mine work ! lol
As the load increases the frequency will decrease to counteract the demand.