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How to connect computer power supply in series or in parallel?


I have about 5 computer power supplies and i want to connect 3 of them in series but they short circuit each other
how do I remove the short circuit protection?

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orksecurity6 years ago
You can't usually stack power supplies the way you would stack batteries -- and the better the power supply, the more likely it is to object.

I'd recommend finding or building a power supply that actually delivers the voltage and current you need.
Yea, this is probably an easier solution. It has short circuit protection for a reason, so it would otherwise blow up. Alternatively, you could solder diodes to all the outputs, but they would have to be high current diodes, and you would need a lot of them.
Jimmeh304 years ago
Good question, I doubt that you can.

option A: (NOT RECOMMENDED) you remove the earth's from the PSU's and isolate the PSU cases from each other

option B: Remove the link inside the PSU's between the GND line, and mains earth (SAFER, BUT STILL NOT RECOMMENDED)

option C: Run each PSU via it's own (three of them in this case) mains isolation transformer but be aware that there is the possibility of substantial floating voltages between the cases of the PSU's and therefore the GND lines also.

I WOULD NOT RECOMMEND ANYONE TRY ANY OF THIS UNLESS THEY HAVE A VERY FIRM UNDERSTANDING OF ELECTRONICS AND GROUNDING.

I ASSUME NO LIABILITY FOR THIS INFORMATION, OR DAMAGES CAUSED SHOULD ANYONE CHOOSE TO TRY ANY OF THIS. YOU DO SO AT YOUR OWN RISK.
iceng6 years ago
I don't understand what you are doing to your supplies to make them
"short circuit each other" ?

If  they are four wire sensing switching supplies, then you must hang
the required small power load resistor across each supply to make it
turn on.

A


series parallel charge.jpg
Jimmeh30 iceng4 years ago
simple, they short because the GND is connected to mains earth, therefore each 12v line will short to it's own ground via the next PSU's earth pin.