Motor controller power management system for electric vehicle

The invention discloses a motor controller power management system for an electric vehicle. The system comprises a vehicle-mounted small battery, a power battery, a DC-LINK acquisition circuit unit, an inverter PFC unit, a DC-LINK power supply circuit unit and a single voltage network unit. The two paths are used for acquiring high voltage, realizing voltage acquisition estimation, voltage division control and alternating current rectification PFC of a high-voltage bus, and adjusting an output load coefficient; meanwhile, when the power is in a dynamic state and is corresponding to abnormity or braking, energy can be recovered into an energy storage capacitor through the function of the PFC unit of the inverter according to the current requirement, and the power is output to a 12V system through the step-down conversion control unit to serve as low-voltage operation power supply, so that low-voltage stable power supply can be ensured in a short time of power failure, and the service life of the system is prol