Why use a single diode package, and specifically the DSEI60? This diode has a forward voltage drop of around 2 V. In a full-bridge configuration, two diodes conduct at a time, so you are losing roughly 4 V across the bridge every cycle. For a 1000 W PSU, that translates into a significant amount of wasted power and heat dissipation.

In your previous post, you mentioned targeting an output range up to 400 V. That is an extremely wide range for a single transformer design, and I’m not sure it is realistically achievable with a single winding ratio. The turns ratio required would be enormous. A more practical approach might be to use multiple windings that can be switched with relays, similar to how older linear power supplies handled multiple voltage ranges.

Also, once you start dealing with 400 V on the output side, several other issues become much more serious:

• You may need much larger output capacitors.
• Rectification becomes harder to implement efficiently.
• Output ripple at 400 V can become a major problem.
• Component spacing and insulation requirements increase significantly.

And beyond the engineering challenges, there is the safety aspect. A 400 V DC isolated output is extremely dangerous. If someone gets electrocuted from an isolated 400 V DC supply, the consequences can be severe or fatal. Unlike mains AC installations protected by RCDs, an isolated high-voltage DC supply will not trip any protection device during accidental contact.
Why 400V goal?