UPS manufacturers introduce the use of isolation transformers in the UPS power supply system. Isolation transformer is a safe power supply, which is generally used for machine maintenance, lightning protection, and filtering. The isolation transformer is usually designed to be designed at the output of the inverter in the UPS power supply, which can play the use of the power supply quality of the new UPS performance improvement. This article UPS manufacturers introduce the use of isolation transformers in the UPS p