We explain what a power supply is, the functions that this device fulfills and the types of power supplies there are.
The source of power or power ( PSU in English) is the device that is responsible for transforming the alternating current of the commercial power line that is received in the homes (220 volts in Argentina) into direct or direct current ; which is the one used by electronic devices such as televisions and computers , providing the different voltages required by the components, usually including protection against possible inconveniences in the electrical supply, such as overvoltage.
The power supplies can be linear or commutative:
The essential functions of the source are four:
The power sources that feed the PCs are inside the cabinet and are usually of the AT or ATX type. The AT power supplies were used approximately until the Pentium MMX appeared, at which time the ATXs began to be used.
The AT sources have motherboard connectors (this differentiates them from the ATX) and in addition, the source is activated through a switch in which there is a voltage of 220 v, which poses a risk when handling the PC. Technologically they are quite rudimentary and are almost no longer used. There was also the problem that having two connectors that had to be connected to the motherboard, confusions and short circuits were frequent.
In the ATX sources the source circuit is more modern and always active , that is, the source is always fed with a small voltage to keep it on hold. An additional advantage of ATX power sources is that they do not have an on / off switch, but work with a push button connected to the motherboard, this facilitates connections / disconnections. According to their power and the type of box, they are classified into sources on AT table (150-200 W), semitorre (200-300), tower (230-250 W), slim (75-100 W), on ATX table ( 200-250 W).
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