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hi
U must to use a push pull system in 20khz frequency to this step up
very very be careful because U choice a big range of power
most lose & hardest section is on primary of your transformers because U have big snober
U don't need H bridge it use just for dc to ac
96V is moderate voltage for power FETs, Push-Pull has advantage of two low side switches (FETs).
2)full bridge only for forward converter?
Push-Pull has same performance as full-bridge with half the number of FETS.
4) have circuit design?
Circuit schematics of similiar power on the web.
5)forward converter can be used for step up? Yes. Output voltage depends on transformer winding ratio.
6)what is the most difficult part of this converter?
Transfomer design. Integrated magnetics (Planar transformers) may be the easiest since one needs only the cores. Since planar cores have high surface to volume ratio, better cooling allows higher frequency operation ... around 250KHz.
7)major loss = ? Generally losses are highest in the power FETs. However a good design balances losses across all of the power components.
8)Output rectification ... synchronous FETs.
At the output voltage and current levels ... synchronous FETs provide the best performance.
Good luck, hope this is not your first design at this power level.
Example current mode PWM controller:
**broken link removed**
or a cascaded current mode controller:
**broken link removed**
Planar transformer catalog at: **broken link removed**
Regardless of the SMPS topology, the SMPS must be bidirectional, i.e. able to move power in either direction, to the load or from it.
Most SMSP topologies can be converted to bidirectional operation so Full Bridge is not the only solution. It is a matter of magnetics cost versus switch cost and other complexities.
If no galvanic isolation is required, it is possible to design without a transformer, using only inductor(s). Using a tandum Buck-Boost configuration ... similiar to a Class-D amplifier (but bidirectional and maybe multi-phase).
For modern results, I think the overall project requires an advanced design and considerable skills. There are several books, journals and magazines dedicated to the subject ... as well as numerous companies designing and selling these types of controllers. Buying what you need might be your best plan.
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