smps dc-dc for dc motor

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franticEB

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Hi,
in order to drive a dc motor i've to design an isolated regulated dc/dc with these features:
50Vin (+/- 10%)
150Vout @ 5Amps for normal operation (750Watts)
50Vout @ 20Amps for 20 seconds particular condition (1KWatt)

What kind of converter can start considering for my project?
Could you suggest me a suitable pwm controller?
Thanks
 

full bridge zvs phase shiftd or full bridge push pull?
What's the better?
 

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