250 Volt DC input for an ATX PC power supply?


Normally, an ATX power supply requires 220 volt AC input. But it converts AC input to DC, before switching.
In this case, can I choose DC input for an ATX power supply?

If yes, what is the required voltage? 250 volt or higher?



  • In the power supply, the AC goes through a step-down transformer. Transformers only work with AC, because with DC you get too much magnetic flux so the core will saturate and overheat.

    Why would you want to do this anyway?
  • My ATX power supply is a switching power supply and has a rectifier before switching. This means, at first AC input converts to DC, then it converts to AC with a higher frequency. The frequency depends on voltage regulators.

    I want to start my computer directly from a battery.
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