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Electronics => Projects, Designs, and Technical Stuff => Topic started by: FxDev on January 23, 2020, 08:00:42 pm

Title: Voltage Sense Input for High Current PSUs
Post by: FxDev on January 23, 2020, 08:00:42 pm

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?

 :-//

Title: Re: Voltage Sense Input for High Current PSUs
Post by: jbb on January 23, 2020, 10:57:49 pm

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)