UPS power supply is uninterruptible power supply.
When the normal AC power supply is interrupted, the battery output DC converted to AC continuous power supply power supply equipment. When the utility input is normal, the UPS will be the utility voltage regulator supplied to the load, at this time the UPS is an AC utility voltage regulator, at the same time it is also charging the battery in the machine; when the utility interruption (accidental blackout), the UPS will be immediately in the machine battery power, through the inverter conversion method to the load to continue to supply 220V AC, so that the load to maintain the normal work and to protect the load of software and hardware from damage. UPS devices usually provide protection against overvoltage and undervoltage.