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Computer Power Supply
The above diagram shows a so-called forward converter with active reset. Half-bridge is also often used in the PC designs. See examples of schematics based on half-bridge: 250W and 300W. The main switch Q2 periodically applies voltage Vdc to the primary of power transformer T1.
ATX power supply connector pinout diagram @ pinouts.ruATX specification includes not only Power Supply Unit, but also interface to case and motherboard. In addition to the old AT standard, ATX 2.0 has one extra voltage line available (+3.3V), a connector chain-lined to the single 20-pin and a power-on wire that allows Software to turn off the PSU.
Computer Power SupplyThe diagram below shows a partial schematic of a 450 watt ATX power supply. Its construction is typical for a modern computer PSU with MOSFET switches and active power factor correction (PFC). Note that most schematics circulating on the internet depict old-style PSU with bipolar transistors and without PFC.
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Power supply unit (computer)A power supply unit (or PSU) converts mains AC to low-voltage regulated DC power for the internal components of a computer. Modern personal computers universally use switched-mode power supplies.Some power supplies have a manual switch for selecting input voltage, while others automatically adapt to the mains voltage.. Most modern desktop personal computer power supplies conform to the ATX ...
Turn a Computer Power Supply into Bench Power | Make:Computer power supplies have a number of safety features that help to protect you and the power supply itself. Here are a couple that you need to know about: Turning on the Power Supply It is designed to not turn on unless it is connected to a computer motherboard. This is controlled by the green “power on” wire. Connecting this wire to ...