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Thread: Does a single rail PSU with 'distributed' output exist?

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    Default Does a single rail PSU with 'distributed' output exist?

    The difference between single and multi rail psus are how the ocps are configured...

    But can a single rail psu actually have distributed output without ocp? Do any of modern psus have this kind of output configuration?

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    You might want to rephrase the question.

    If you have a single +12V output that outputs to multiple circuits, how are you going to differentiate that as a "multiple rail PSU" if each circuit doesn't have OCP? What else would you expect to be added? Separate filtering for each rail?

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    Yes I know my question is crappy...

    The reason why I asked it is some guy said that
    'single rails don't have strict separated ocp, but can be distributed internally and the outputs may be separated-limited',
    but I never heard this before.

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    You're talking to some weird people that like to double speak and generalize.

    Like the whole "LLC is less reliable" thing.

    True that a cheaper single +12V rail PSU may not have OCP and rely on OPP for protection. But most better PSUs use a supervisor IC that supports OCP.

    And the very definition of a multiple +12V rail PSU is a single +12V rail PSU separated into separate circuits, each with it's own strict OCP. So I don't have any idea what this guy you're talking to is talking about. Multiple +12V rails doesn't simply mean a +12V rail split out into separate cables because that would define every ATX PSU out there!!!!

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    Yes so many stuffy people...
    I don't know what to say to them lol

    + Guess he is talking about separated PCB patterns / but no ocp, does this have any differences with combined pattern?

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    Quote Originally Posted by rgbodosk View Post
    Yes so many stuffy people...
    I don't know what to say to them lol

    + Guess he is talking about separated PCB patterns / but no ocp, does this have any differences with combined pattern?
    Traces in a PCB carries power just like wires do.

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    So you mean there is no difference in separated/integrated output pcb trace pattern if there is no ocp?

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    Quote Originally Posted by rgbodosk View Post
    So you mean there is no difference in separated/integrated output pcb trace pattern if there is no ocp?
    Nope.

    There are plenty of single +12V rail designs that have the +12V output to multiple spots on a PCB and then to their output and that's still considered a single +12V rail.

    Especially with fixed cable PSUs; you can't have all of your +12V leads come out of the same place on the PCB. Too difficult to assemble and too much resistance leading to that point. So it's not uncommon to split the +12V up to two, three or more traces and solder different +12V leads to those points. It's still a single +12V rail unless there's OCP on those leads.

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