UPS is divided into three categories according to the working principle: backup type, online type and online interactive type.
One of the most commonly used is the backup UPS, which has an automatic voltage regulator, power outage protection and other UPS the most basic and important functions, although there is generally about 10ms conversion time, the inverter output AC is a square wave rather than sinusoidal, but due to the structure of the simple and inexpensive, reliable and high quality advantages, so it is widely used in the field of microcomputer, peripheral, POS and so on.
Online UPS structure is more complex, but the performance is perfect, can solve all the power problems, such as four-way PS series, its significant feature is able to continue to zero interruption of the output of pure sinusoidal alternating current, able to solve the spikes, surges, frequency drift, and other power problems; due to the need for greater investment, usually used in critical equipment and network centers and other power requirements of the harsh environment.
Online interactive UPS, compared with the backup type, online interactive with filtering, anti-utility interference ability is very strong, the conversion time is less than 4ms, the inverter output is analog sine wave, so it can be equipped with servers, routers, and other network equipment, or in the power environment of the region.