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Thread: Can OPP in single rail PSUs replace 12V OCP?

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    Default Can OPP in single rail PSUs replace 12V OCP?

    Can OPP in single rail PSUs replace 12V OCP?
    I mean, is there any difference in real world - is it meaningful to have a separated 12V OCP?

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    Yes

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    Yes to the what ('Can OPP in single rail PSUs replace 12V OCP?', or 'is it meaningful to have a separated 12V OCP?') ?

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    OPP in single rail PSUs replace 12V OCP

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    I'm lost

    I assume OPP = Over Power Protection, if so how is that different from OCP (Over Current Protection)? assuming the voltage does not sag.

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    Quote Originally Posted by ashiekh View Post
    I'm lost

    I assume OPP = Over Power Protection, if so how is that different from OCP (Over Current Protection)? assuming the voltage does not sag.
    OPP monitors and triggers off of the AC side of the unit, while OCP monitors and triggers off the DC side. Both have trigger points based on current draw.

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    ashiekh (01-25-2020)

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    Quote Originally Posted by Tator Tot View Post
    OPP monitors and triggers off of the AC side of the unit, while OCP monitors and triggers off the DC side. Both have trigger points based on current draw.
    Ah, now I get it.

    But one can't really go on current draw, as the current at 110V is rather different from that at 220V

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    Quote Originally Posted by Jon Gerow View Post
    OPP in single rail PSUs replace 12V OCP
    Some reviews like Aris' separately mention the OPP and 12V OCP, do high end PSUs have separated 12V OCP and OPP unlike budget ones?
    I'm asking this because someone said OPP and 12V OCP has different trigger location on PCB..?

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    OCP it's faster.

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    Slower is better to allow short surges.

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