SYSTEM COMPATIBLE CIRCUIT, UNINTERRUPTIBLE POWER SUPPLY AND SYSTEM COMPATIBLE METHOD

The present application is applicable to the technical field of uninterruptible power supply, and discloses a mode compatible circuit, an uninterruptible power supply and a mode compatible method, the mode compatible circuit includes a main circuit; in the main circuit, an A-phase input end is respectively connected with the first wiring terminal and a first output end of the mode compatible circuit through the first conversion unit, a B-phase input end is respectively connected with the second wiring terminal and a second output end of the mode compatible circuit through the second conversion unit, a C-phase input end is respectively connected with the third wiring terminal and the fourth wiring terminal through the third conversion unit, and an N-line input end is respectively connected with the fifth wiring terminal, the sixth wiring terminal and a fourth output end of the mode compatible circuit; and the seventh wiring terminal and the eighth wiring terminal are connected with a third output end of the mode compatible circuit. The present application can directly switch between different modes by controlling the connection relationship between the wiring terminals, and saves cost.