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About ATX power supply
ATX power role is to convert AC power of 220V into DC 5V of internal computer, 12V, 24V power supply.
ATX power supply features: power compared to AT, ATX power increase "+ 3.3V, + 5VSB, PS-ON
"Three outputs, where" + 3.3V "output is mainly used for memory, and" + 5VSB "," PS-ON "reflects the characteristics of the output power of the ATX power supply .ATX main feature is that it does not use conventional mains power supply switch to control whether, instead of using a combination of "+ 5VSB, PS-ON" to achieve the power on and off, as long as the change in signal level of the control "PS-ON", the power-on control can be . "PS-ON" on and off less than 1V volt power supply, power is off more than 4.5 volts and power are not the same AT, ATX power supply in addition to the line made some improvements, the most important difference is that, when the ATX power itself off He did not completely off, but maintains a relatively weak current, while it uses the current increases a power-management feature called Stand-by. it allows the operating system directly to the power management. With this feature, users can be achieved directly through the operating system soft shutdown, but may also be implemented in the power management network as turning on the power, the computer can send a signal to the network through the Modem, After the monitoring circuit will send an activation voltage + 5VSB a unique ATX power supply, to start the computer power is turned on, so that remote power.
ATX power supply is mainly available in two versions, one is ATX1.01 version, the other is ATX2.01 version. 2.01 and 1.01 ATX power supply in addition to the position of the cooling fan is not the same, the activated currents thereof are different. 1.01 only 100mA, version 2.01 have 500mA ~ 720mA. This means that the version 2.01 ATX power supply will not be as 1.01 version as "allergy", often influenced by external voltage fluctuations and start the computer itself.
Detailed ATX power connector
Pin 20 and pin 24 (FIG)
Detailed atx power connector
Reference: https://wenku.baidu.com/view/fc55c1cf08a1284ac850438f.html
