UPS is an abbreviation for Uninterruptible Power System, which emerged with the birth of computers and is one of the commonly used peripheral devices in computers. In fact, UPS is a constant voltage and rated uninterruptible power supply that contains energy storage devices and is mainly composed of inverters. In its early stages of development, UPS was only considered as a backup power source. Later, due to power grid quality issues such as voltage surges, voltage spikes, voltage transients, voltage dips, continuous overvoltage or undervoltage, and even voltage interruptions, the electronic systems of computers and other equipment were disrupted, causing serious consequences such as damage to sensitive components, loss of information, and flushing of disk programs, resulting in huge economic losses. Therefore, UPs are increasingly valued and have gradually developed into a power protection system with functions such as voltage stabilization, frequency stabilization, filtering, electromagnetic and radio frequency interference resistance, and voltage surge prevention. Currently, a wide variety of UPS power supply equipment can be purchased in the market, with output power ranging from 500MA to 3000WA. When there is mains power supply to UPS, the UPS stabilizes the mains power (220V ± 5%) and supplies power to the computer. At this point, the UPS is an AC mains voltage stabilizer, and it also charges the internal battery. Due to the different design of UPS, the range of UPS adaptation is also different. A variation of ± 10-15% in UPS output voltage is generally considered normal for computer use. When the power supply is abnormal or interrupted, UPS immediately converts the electrical energy of the internal battery to the computer system through inverter conversion, in order to maintain the normal operation of the computer system and protect the software and hardware of the computer from loss.