Control circuit compatible with battery power supply and external power supply

A control circuit compatible with a battery power supply and an external power supply, comprising:

• a switch module, a switch control module, a battery connector module, and an external power supply connector module, a first end of the switch module being connected to the battery connector module, a second end of the switch module being connected to a second end of the switch control module, and a third end of the switch module, which serves as a power supply output end, being connected to the external power supply connector module, wherein
• the switch module is configured to disconnect a power supply circuit between the battery connector module and the power supply output end when receiving a first control signal output from the switch control module, and to connect the power supply circuit between the battery connector module and the power supply output end when receiving a second control signal output from the switch control module;
• the switch control module is configured to output the first control signal when receiving an external power supply signal output from the external power supply connector module, and to output the second control signal when failing to receive an external power supply signal output from the external power supply connector module;
• the battery connector module is configured to output a battery power supply signal to the switch module when being connected to a battery;
• and
• the external power supply connector module is configured to output the external power supply signal to the switch module and the switch control module when being connected to the external power supply.