Power supply system, and control method and apparatus

A vehicle, wherein the vehicle comprises:

• a first power supply;
• a second power supply;
• a load;
• and
• a power supply system, comprising:
• a first power supply circuit connected to the first power supply and the load;
• a second power supply circuit connected to the second power supply and the load;
• a detection and hold control circuit connected to the first power supply, the second power supply, and the load;
• and
• a controller connected to the detection and hold control circuit, the first power supply circuit, and the second power supply circuit, wherein
• the controller controls the first power supply circuit and/or the second power supply circuit to be connected to the load;
• an output current of the first power supply circuit is a first current when the first power supply circuit is connected;
• an output current of the second power supply circuit is a second current when the second power supply circuit is connected and the first current is less than the second current;
• the detection and hold control circuit sends a first wake-up signal to the controller and the second power supply circuit when detecting that the first current is greater than or equal to a first threshold;
• the controller enters a working state when receiving the first wake-up signal and sends a first hibernation signal to the first power supply circuit;
• the first power supply circuit is disconnected when receiving the first hibernation signal;
• and
• the second power supply circuit is connected to the load when receiving the first wake-up signal.