I am assuming that this is a low frequency (50/60Hz) toroidal transformer ?
Stacking two cores halves the number of turns required, but it will also require wire with twice the cross sectional area to carry double the current. That will double your power.
Large ferrite toroids can be made to work at 50kHz, but the primary and sec need to be inter-wound to get the leakage right down on large cores, we have seen this done at 3kW and higher, to answer your question putting two cores together gives you double the cross sectional area and hence reduces the turns required for say 200mT peak in the core, giving you about twice the power transfer capability of one core...
Yes indeed, but he is specifically wanting push pull, presumably because its low voltage and VERY high current at 3KW. That needs to be taken into account and presents some rather nasty difficulties. Its not a good combination.p.s. full bridge drive will work a lot better at this power level... rather than push pull... also gives you more effective Cu on the Tx
risingstar, what voltage in and what voltage out do you want.
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