POWER Chassis
A (computer) power supply is a switched-mode supply designed to convert 110-240 V AC power from the mains supply, to several output both positive (and historically negative) DC voltages in the range + 12V,-12V,+5V,+5VBs and +3.3V. The most common computer power supplies are built to conform to the ATX form factor.
The diverse collection of output voltages also have widely varying current draw requirements, which are difficult to all be supplied from the same switched-mode source.
Consequently most power supplies actually consist of several different switched mode supplies, each producing just one voltage component and each able to vary it's output based on component power requirements, and all are linked together to shut down as a group in the event of a fault condition.
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