Voltage Sense Input for High Current PSUs

[FxDev]

Hello,

I designed 24V 250A PSU. In this project I used TL431 for feedback but one of my customer wants to use Sense Input for long distance voltage drop.

Can you suggest me any schematics or app notes about that?

 

[jbb]

That’s quite a big supply you’ve built there; I can see why remote sense is an issue.

I haven’t done one myself, but you could have a look at the EEZ BB3 design (schematics available on Github).

My guess about things to look out for:
- swapped leads
- don’t blow up if a lead falls off (ie don’t have output voltage suddenly go to max!)
- how much cable voltage drop will you support? (Note, someone working on batteries might want to put a diode in series)
- how much current will you draw from the load if the power supply is off? (Batteries again)
- will long leads (ie inductance) cause oscillation?
- will the supply be OK if the mains input is removed and there’s still voltage at the output? (Eg capacitor banks and batteries)