Mainly used to provide uninterrupted power supply to a single computer, computer network system, precision instruments, data centers or other power electronic equipment.
When the utility power input is normal, the UPS will be the utility voltage regulator supplied to the load, at this time the UPS is an AC voltage regulator, the same it is also to the battery charging; when the utility power interruptions or accidents when the power failure, the UPS will be immediately in the machine battery power, through the inverter converter to the load to continue to supply the 220V alternating current, so that the load to maintain the normal work and to protect the load of soft, hardware, and so on. The UPS can also be used to protect the software and hardware of the load from damage.
UPS equipment usually provides strong protection against overvoltage or undervoltage.