What is PSU Power Supply?

August 25, 2022

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What is a PSU and what does it do? PSU stands for Power Supply unit, an internal IT hardware component. Instead of supplying the systems with power, it converts the electricity source into the correct voltage. By receiving power from an electrical outlet, it converts the current from AC (alternating current) to DC (direct current).

Why is a PSU important?
The power supply unit is a crucial component for any server. Without it, your IT infrastructure can’t function. When choosing a PSU, it is important to check its compatibility with the form factor of your server and motherboard. To determine how much power it can provide to computers, you must consider the rating of PSUs. The higher wattage rating, the more power the unit can provide.

PSUs have essential functions and operate differently depending on the device. It can modify the voltage, convert power to DC from AC, or regulate power for a smoother voltage. The main components typically consist of the AC supply, Transformer, rectifier, filter, regulator, and DC output. Not all Power Supplies contain these components, but they are essential functions.

AC Supply: alternating current
Transformer: changes the incoming voltage to the necessary outgoing voltage
Rectifier: converts incoming power from AC to DC; is either half-wave, full-wave, or bridge
Filter: regulates the flow from AC to DC for a smooth voltage
Regulator: reduces the ripple voltages left by the filter and removes any voltage surges or drops, preventing damage to devices plugged into the power supply
DC Output: direct current

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