Energy-saving hub

An energy-saving hub, adapted to be electronically connected to an electronic device, an AC power source and a mobile device located outside the energy-saving hub, the energy-saving hub comprising:

• a power supply interface, used to connect to the AC power source;
• a power module, connected to the power supply interface;
• an upstream connector, used to connect to the electronic device;
• a downstream connector, used to connect to the mobile device;
• a main control circuit, electronically connected to power module;
• a system circuit, electronically connected to the upstream connector, the downstream connector and the main control circuit, and the system circuit is maintained in a sleep mode;
• an upstream detector, electronically connected to the upstream connector, the power module and the main control circuit;
• and
• a downstream detector, electronically connected to the downstream connector, the power module and the main control circuit;
• wherein when the upstream connector connects to the electronic device, the upstream detector transmits an upstream device connection signal to the main control circuit;
• when the main control circuit receives the upstream device connection signal, the main control circuit transmits a wake-up signal to the system circuit;
• and when the system circuit receives the wake-up signal, the system circuit is switched from the sleep mode to a wake-up mode:
• wherein the power module supplies power to the main control circuit and the system circuit in an intermittent power supply mode before the system circuit is switched from the sleep mode to the wake-up mode.