Hello Guys,
I want to design high power supply for below requirement. I want to start with topology selection so could any one help me to start the design.
Input : 48vdc
output : 3.5KV, 3mA
Any reference design, application notes, ideas are highly appreciable.
Thanks in Advance !

 

How accurate do you need the 3.5kV to be? I'd go for a 48v - 400v+400v inverter and a full-wave Cockroft-walton voltage multiplier chain

 

multi stage flyback is the commonly used approach

 

multi stage flyback is the commonly used approach

Hi, thanks for answer.
could you please share some reference document for multistage flyback.

 

A flyback, CrCM for preference with say, in this case, 5 x 700V output sections, after the sec side diode(s) and a good film cap(s), put the sections in series, for 3500V. You will need special attention to dividing down the output to get a signal for the feedback loop - as leakage currents can occur for high impedances, you also need a sec side aux supply to power the opto led . . .

 

A flyback, CrCM for preference with say, in this case, 5 x 700V output sections, after the sec side diode(s) and a good film cap(s), put the sections in series, for 3500V. You will need special attention to dividing down the output to get a signal for the feedback loop - as leakage currents can occur for high impedances, you also need a sec side aux supply to power the opto led . . .

Hi pwrtrnx,
Thanks for your valuable support. i really appreciate your guidance.
I understood the concept could you please share any gate driver ic, which is best suit for this application.
Also why are you not thinking of primary side regulation in spite of having secondary side regulation.
Thanks once again for leading the discussion.
Regards, M

 

How accurate do you need the 3.5kV to be? I'd go for a 48v - 400v+400v inverter and a full-wave Cockroft-walton voltage multiplier chain

Hi, thanks for comment.
I need regulated output voltage, accuracy 10% would be okay.
If you post any schematic would be really great.
Thanks !

 

It might be time for you to present a design - based on your best efforts - this is not a trivial job

the transformer needs to be intelligently designed and a suitable freq chosen.