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Thread: Questions about modding PC PSU to be floating

  1. #1

    Questions about modding PC PSU to be floating

    Since I don't have enough money at the moment to purchase a good bench power supply, I want to 'mod' a PSU. In the first instance not by opening the PSU, but just by making an adapter that also puts a load on it's 5V rail.

    But after taking a closer look (with a multimeter) I found an issue that could be a problem. In contrast to bench supplies (from my University) I'm familliar with a PSU is not floating. It's ground outputs are connected directly to ground.

    This could be a very big problem if I mistakenly connect the ground hook of a probe to a higher potential point, thus creating a short which probably will evaporate the probe lead. I know myself, this will happen someday.

    As for the AC side I think without opening it should look like this:
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    Where the Live, Neutral and Earth wire are labeled, My personal safety simply modeled as a resistor(http://www.kynix.com/Product/83.html), and a failure that should trigger the RCD/Circuit-breaker as a switch.
    RLOAD being of course an very basic simplification of the rest of the circuit.

    Now for my question: Are there any issues that could occur by making the modification:

    • Lifting the Earth from the neutral line @RLOAD
    • Keeping the Earth connected to the metal chassis of the supply.


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    Are there also concerns with quality/stability. As in +5 or +12V rails being way out of spec when measured?

    I've been thinking about this for some hours and I think there wouldn't be any major issues, but since I do not have a background or vast knowledge in power supply design I'd like to hear your take on this.

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