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Full bridge DC DC Converter with soft switch

ABDUL SHAHEED54
Prodigy 130 points

I am planning to make a 1.65KW DC DC converter as specified below

input:  70V+/-5V
Output: 550V/ 3A
Efficiency: 90% min

Freq : 200KHz-400KHz (tentative)

Topology selected: Full bridge ZVS with active clamp . (Basic diagram attached).

Requesting you for the dedicated PWM controller IC for the same.  how to drive auxilary switch Sc in the diagram?

If any other new improved topology and controller available, Please suggest..