UPS is an uninterruptible power supply, which is an energy storage device. UPS is an uninterruptible power supply, which is a constant voltage and frequency uninterruptible power supply with an energy storage device and an inverter as the main component. When the mains power is supplied normally, UPS stabilizes the mains power and supplies it to the load, and it also charges the internal battery; when the mains power is interrupted (power outage due to an accident), UPS immediately converts the power of the internal battery to continue to supply 220V/380V AC to the load through the inverter conversion method, so that the load maintains normal operation and protects the load software and hardware from damage. Working principle: When the mains power is input normally, UPS stabilizes the mains power and supplies it to the load, and charges the built-in battery pack at the same time. When the mains power is interrupted, UPS immediately converts the energy of the built-in battery and instantly continues to supply the load with 220V AC, so that the load maintains normal operation and protects the equipment software and hardware from damage.