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Probably a full bridge forward converter. But what oh what are you doing?
you can get 95% efficiency with IGBTs, but not at 120vac input if you include the diode losses.
I was thinking one buck. With 3 bucks the current is down to 100A. With 9 bucks the current is down to 30A. At 30A I have the parts here to do that. Little modules have a advantage in that if one fails the rest will do the work until it can be replaced.multiphase buck converter
Hi,It sounds like you have a permanent magnet alternator.. field weakening or no?
I would look at just using a three phase diode stack since the output of the alternator is probably trapezoidal anyway, and build a big multiphase buck converter.
285 amp output.. i would look at 9 or so phases.. each configured in constant current mode.
you'll need to interleave the phases
you can get 95% efficiency with IGBTs, but not at 120vac input if you include the diode losses.
At first there was no mention of alternator windmill so I assumed the 120V AC to 420V AC came from the power line where PFC makes a difference.Input from 120 V AC to 420 V AC , and output about 140 v dc .