Internals of a PSU with passive PFC (left) and active PFC (right) The most recent ATX PSU standard is version 3.0 as of mid-2022. They also provide a signal to the motherboard to indicate when the DC voltages are in spec, so that the computer is able to safely power up and boot.

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 main voltage.

Modern personal computers universally use switched-mode power supplies. Internal computer component that provides power to other components 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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