The application provides a power supply
control circuit, a control method and an automobile. The power supply
control circuit at least comprises a trigger circuit, a switching circuit, a self-locking circuit, a fast starting circuit, a first
control circuit and a second control circuit. In the shutdown state, when the first control circuit receives an
upgrade instruction, the self-locking circuit enables the switching circuit to be turned on, so that the first control circuit is turned on, thereby realizing
system upgrade after the engine is turned off. In the
sleep state, the switching circuit in the on state detects the enable
signal of the trigger circuit, the first control circuit sends the enable
signal to the fast starting circuit, and the fast starting circuit controls the second control circuit to be turned on, so that the
load unit enters the normal working state, thereby realizing the fast starting of the second ignition within the preset time. The method realizes that the vehicle
machine is completely turned off in the shutdown state, the static current reaches 0 mA, and supports
system upgrade after the automobile is turned off and fast starting of the second ignition within the preset time.