Three-phase active short-circuit protection system and method for motor controller of electric vehicle

The invention discloses a three-phase active short-circuit protection system for a motor controller of an electric vehicle, which is characterized in that when a main control chip fails and an FS control chip judges that a motor power module needs to enter an ASC mode, an enable signal is output to enable a first control power supply module and a driving power supply module to stop working; the main control chip is powered down due to the fact that the first control power supply module stops working, the primary side of the driving chip is powered down due to the fact that the first control power supply module stops working, and the secondary side upper bridge arm driving signal generation module and the secondary side lower bridge arm driving signal generation module of the driving chip are powered down due to the fact that the driving power supply module stops working. And the FS control chip outputs an upper bridge arm or lower bridge arm driving signal of the three-phase inverter bridge, and the upper bri