The voltage available from a wall outlet is a poorly regulated AC ranged worldwide from 90V to 240V, while most electronic circuits require a well stabilized low-voltage DC. That's why all electronic equipment needs some form of power conversion. A PC power supply unit (PSU) is an internal device that converts an input AC to a set of regulated DC voltages needed by personal computer. In the process it also provides primary to secondary safety isolation. Since the introduction of IBM PC/XT, there have been about a dozen different PC types. They differ by their structure, form factors, connectors and volt/amp ratings. The output rating of a modern computer PSU ranges anywhere from 185 W to several kilowatt. The units over 400W are used mainly for servers, industrial PCs and to supply the desktops with high-end video applications
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25 сен 2013
