Hello,
We are doing a 2.8kW offline LLC converter..
Vin = 390VDC
Vout = 180VDC
F(SW) = 91kHz
We have done a section-wound LLC transformer, and the main reason for this was because when restricted to using round sectioned enamelled copper wire, “sectioned” winding more easily facilitates achieving lower winding resistance.
However, do you know what the likely leakage inductance term (seen from primary) would be for this sectioned winding configuration?
We need a total of 100uH for the resonant inductor, and we expect that to be comprised of some leakage inductance and some external inductance.
How much do you think the leakage inductance term will be?
(The transformer diagram and LLC schematic are attached.)