Thank you. Is there any controller that you know for hb or fb? It can be done with hard switching with Sic s right?an half bridge or full H bridge with transformer will give you full control - and protect your load from a shorted device
A simple buck can work - but if the mosfet goes short the load sees the full Vin
Snubber and IGBT can handle that voltage. Only full bridge can manage that voltage easily, but will be too expensive for that power. 2-Switch Forward will be limited by duty cycle due to the 150V input minimum, Interleaved Forward can, but will be too expensive too.At 550 watts and running off 420V DC input - the push pull sees 840V on the drains + spikes - so not the best choice here.
Resonant converters are difficult to design in combination with wide input voltage range. So, they are typically designed with a PFC pre-stage. The input voltage is DC , adding pre-boost DC-DC will also be expensive.At 550 watts and running off 420V DC input - the push pull sees 840V on the drains + spikes - so not the best choice here.
Resonant will need pre-regulator to meet that input voltage range. With that power, output voltage regulation will be a challenge , will require complex tuning. Additional high side Gate driver cost and Half bridge will require bigger output inductor.We design resonant converters with wide range inputs - however the half bridge hard switched will also work here and is a lot less effort in understanding for the OP.
IGBT are typically rated at 1200V as Mosfet replacement for high voltage application.At 550 watts the dual resonant forward is a contender also - as it reduces input ripple and has easy control - the EMI signature is much lower than a hard switched push pull with > 900V on the fet or igbt drains ! ! !
So . . .
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