System compatible circuit, uninterruptible power supply and system compatible method

The invention is applicable to the technical field of uninterruptible power supplies, and discloses a system compatible circuit, an uninterruptible power supply and a system compatible method. The above circuit comprises a main circuit, an A-phase input end is connected with a first wiring terminal and the first output end of the system compatible circuit through a first conversion unit, and a B-phase input end is connected with a second wiring terminal and the second output end of the system compatible circuit through a second conversion unit; a C-phase input end is respectively connected with a third wiring terminal and a fourth wiring terminal through a third conversion unit, an N-line input end is respectively connected with a fifth wiring terminal, a sixth wiring terminal and the fourth output end of the system compatible circuit, and a seventh wiring terminal and an eighth wiring terminal are both connected with the third output end of the system compatible circuit. According tothe invention, the switch