A UPS generally consists of a rectifier, battery, inverter, static switch and control system. On‐line UPS is generally used. Firstly, it converts AC power from the mains input into an adjustable DC power supply to power the batteries and loads.

The inverter is then converted into a stable, pure, quality AC power supply. It completely eliminates any power problems (voltage fluctuations, frequency fluctuations, harmonic distortions and various disturbances) that may occur in the input power supply.

Due to the equipment in the server room there are a variety of switching power supply nonlinear loads and a variety of printer loads, these loads have a large inrush current. If the UPS power supply capacity is too small, long‐term heavy load operation, prone to waveform distortion, easy to cause the output of the final power device overcurrent, coupled with the heat generated by the heavy load, which is obviously unfavorable to the reliability of the system. For high‐power UPS, it is generally recommended that the capacity utilization rate is controlled between 0.6 and 0.8.

Does UPS have high power factor? When the UPS load for inductive or capacitive loads, should be used with full‐bridge soft‐switching converter UPS. UPS accompanied the birth of the computer, UPS as a computer peripheral equipment, is an energy storage device inverter as the main component, voltage and frequency output stabilization of power protection equipment. It can solve the existing blackout, ground voltage, pressure, surge, noise and other phenomena, so that the computer system operation is more secure and reliable. At present, it has been widely used in computer, communication, banking, securities communication, medical treatment, industrial control and other industries.