Structurally, the difference between power frequency UPS and high-frequency UPS is mainly manifested in the isolation transformer, and the use of isolation transformer by power frequency UPS greatly improves the reliability of UPS. In terms of overall performance, both power frequency and high-frequency machines have their own advantages and disadvantages. At least currently, there is no problem of who replaces who. Customers should base their equipment selection on their own actual needs, rather than blindly following others. For example, if enterprises want to build medium to large data centers, the requirements for reliability and stability should be placed first, and high-power industrial frequency UPS should be the first choice; If it is a general office application or mainly considering the occupation of space by equipment, high-frequency UPS can be considered.