A mode compatible circuit comprising a main circuit and a control circuit, characterized in that: the main circuit comprises a first conversion unit, a second conversion unit, a third conversion unit, a first wiring terminal, a second wiring terminal, a third wiring terminal, a fourth wiring terminal, a fifth wiring terminal, a sixth wiring terminal, a seventh wiring terminal and an eighth wiring terminal; the control circuit is respectively connected with the first conversion unit, the second conversion unit and the third conversion unit; an A-phase input end of the main circuit 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 of the main circuit 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 of the main circuit is respectively connected with the third wiring terminal and the fourth wiring terminal through the third conversion unit, and an N-line input end of the main circuit 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; in a first mode, the control circuit is adapted to control a phase difference of an output of the first conversion unit and an output of the second conversion unit, a phase difference of the output of the second conversion unit and an output of the third conversion unit, and a phase difference of the output of the third conversion unit and the output of the first conversion unit to be all a preset phase difference; and in a second mode, the control circuit is adapted to control the output of the first conversion unit, the output of the second conversion unit and the output of the third conversion unit to be all same, without a phase difference; the mode compatible circuit is configured to: in the first mode, connect the third wiring terminal and the fourth wiring terminal with the seventh wiring terminal and the eighth wiring terminal respectively; and in the second mode, connect the first wiring terminal and the second wiring terminal with the third wiring terminal and the fourth wiring terminal respectively, and connect the fifth wiring terminal and the sixth wiring terminal with the seventh wiring terminal and the eighth wiring terminal respectively. the main circuit comprises a first conversion unit, a second conversion unit, a third conversion unit, a first wiring terminal, a second wiring terminal, a third wiring terminal, a fourth wiring terminal, a fifth wiring terminal, a sixth wiring terminal, a seventh wiring terminal and an eighth wiring terminal; the control circuit is respectively connected with the first conversion unit, the second conversion unit and the third conversion unit; an A-phase input end of the main circuit 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 of the main circuit 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 of the main circuit is respectively connected with the third wiring terminal and the fourth wiring terminal through the third conversion unit, and an N-line input end of the main circuit 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; in a first mode, the control circuit is adapted to control a phase difference of an output of the first conversion unit and an output of the second conversion unit, a phase difference of the output of the second conversion unit and an output of the third conversion unit, and a phase difference of the output of the third conversion unit and the output of the first conversion unit to be all a preset phase difference; and in a second mode, the control circuit is adapted to control the output of the first conversion unit, the output of the second conversion unit and the output of the third conversion unit to be all same, without a phase difference; the mode compatible circuit is configured to: in the first mode, connect the third wiring terminal and the fourth wiring terminal with the seventh wiring terminal and the eighth wiring terminal respectively; and in the second mode, connect the first wiring terminal and the second wiring terminal with the third wiring terminal and the fourth wiring terminal respectively, and connect the fifth wiring terminal and the sixth wiring terminal with the seventh wiring terminal and the eighth wiring terminal respectively. in the first mode, connect the third wiring terminal and the fourth wiring terminal with the seventh wiring terminal and the eighth wiring terminal respectively; and in the second mode, connect the first wiring terminal and the second wiring terminal with the third wiring terminal and the fourth wiring terminal respectively, and connect the fifth wiring terminal and the sixth wiring terminal with the seventh wiring terminal and the eighth wiring terminal respectively.