Power Supplies

What is a power supply unit?

A power supply unit (PSU) is an electronic device that converts electrical energy from one form to another, providing stable voltage and current for equipment operation. These power sources act as an intermediary between the electrical grid and the device, protecting equipment from voltage surges and ensuring the correct operation of electronic components.  

Why power supply units are needed

The main task of a power supply unit is to deliver exactly the amount of energy required for the device to operate. Without it, most modern equipment simply would not function.  

Where power supply units are used

The scope of power supply units is extremely wide. They are found in:  

• household appliances (televisions, computers, phone chargers);
• industrial installations and automated systems;
• telecommunications and server equipment;
• medical and laboratory equipment;
• video surveillance and alarm systems.

Main types of power supply units

There are several main types:

• linear
• switching
• adapters and chargers
• uninterruptible power supplies (UPS).

Power supply unit characteristics

When choosing, it is important to pay attention to key parameters:  

• Output voltage (V) – must meet the device's requirements.
• Output current (A) – determines the maximum power the unit can deliver.
• Power (W) – calculated as the product of voltage and current.
• Efficiency – shows how effectively the unit converts energy.
• Protections – against overloads, overheating, short circuits.
• Form factor – important for computer power supply units (e.g., ATX, SFX).

How to choose a power supply unit

To choose the right power supply unit, consider a few tips:  

1. Determine the power – sum the total power of all devices that will be connected, and add a 20–30% reserve.
2. Pay attention to compatibility – voltage and connector type must meet equipment requirements.
3. Consider usage conditions – a UPS is better suited for servers or surveillance cameras, while a simple switching power supply is sufficient for household appliances.

At Flash Army, you can buy a power supply unit that will meet your needs.