Is it possble to drive two transformers?

[luka]

Hi all

Is it possble to drive two transformers in smps@230v from one set of transistors(half-bridge).
I would like to know that because, I would like to drive two ETD 39 or similar , or even toroid insted of one bigger like ETD 49(this one is too big to put in 1H box).

 

[mzzj]

possible, yes. Just use half turns for each primary(or secondary) and wire them in series

 

[Eva]

Furthermore, if you connect primaries in series, you can connect secondaries in paralell, and you can even use two sets of output inductors and diodes without worrying about current sharing. The series primary connection will ensure that the same current flows through both secondaries.