The main functions of the UPS system are in two aspects:

(1) As an AC power supply for important equipment, it prevents sudden power outages from the mains from affecting normal operation and causing damage to the equipment.



(2) Eliminate "power pollution" such as power surges, momentary high/low voltages, wire noise and frequency shifts in the mains power supply, improve power quality, and provide high-quality power for computers, etc.



Classification of UPS

There are mainly three types of UPS systems: standby, interactive and online.
(1) Standby type: It is equipped with functions such as automatic voltage stabilization and power-off protection. The conversion time is about 10ms. The alternating current output by the inverter is a square wave. The structure is simple and the price is low.



(2) Interactive type: It has a filtering function, strong resistance to mains power interference, conversion time less than 4ms, inverter output is an analog sine wave, and the price is much lower than that of the online type.



(3) Online type: It has a relatively complex structure and complete performance. It can continuously output pure sinusoidal AC power without interruption and solve all power supply problems such as spikes, surges and frequency drift. It is expensive and is usually applied in environments with strict requirements for electricity, such as critical computers and network equipment.