ATX power supplies are turned on and off by a signal from the motherboard. While an ATX power supply is connected to the mains supply, it always provides a 5- volt standby (5VSB) power so that the standby functions on the computer and certain peripherals are powered. Most modern desktop personal computer power supplies conform to the ATX specification, which includes form factor and voltage tolerances. Some power supplies have a manual switch for selecting input voltage, while others automatically adapt to the mains voltage. Modern personal computers universally use switched-mode power supplies. An ATX power supply unit with top cover removedĪ power supply unit ( PSU) converts mains AC to low-voltage regulated DC power for the internal components of a computer.
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