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Accuracy of PS and its effect on N+1 redundancy

Leonid Sapozhnikov
Prodigy 40 points

I have the following question for use N+1 ideal diod controllers for O-ring multiple supplies.

I am checking accuracy of supply I want to use and at 48V it says it is +/-2%, or about 2V difference in extreme case.

All ideal diode controller will shot downloer contributor if they see difference of -0.025V drop across controller.

It is really hard to much PS to 25mV accuracy, given extreme of ~2V

So, it is other I am missing something or there are standard practice of tow to mitigate this condition.

Thank you for advise.

  • 0
    TI__Genius 12380 points

    Hi Leonid,

    There are passive sharing methods and active sharing regulation loops.

    Passive may involve adding a small series resistor (sometimes called droop method, or ballast resistors, etc). Here is a source for some information, otherwise you can search some combination of these keywords (ORing, droop, load sharing, passive, ":

    powerelectronics.com/.../50110.pdf

    For active, it can become quite complex and I am unaware of a good article guideline on designing active sharing schemes.

    Edit: For reference, we have the following article on 12V current sharing for ORed supplies, but I'm unaware of a similar solution for 48V:


    Thanks,
    Alex