Motherboard

A motherboard applicable in electronic devices, the motherboard comprising a power circuit, a system power supply, and a central processor unit (CPU), the power circuit comprising:

• a direct current (DC) voltage input terminal;
• a first control circuit to receive a direct current (DC) voltage corresponding to one kind of electronic device through the DC voltage input terminal and output a first control signal;
• a second control circuit to receive the first control signal from the first control circuit and output a second control signal to the CPU and output a third control signal;
• a switching circuit comprising a plurality of switches, the second control signal output from the second control circuit to control the corresponding switches of the switching circuit on or off;
• and
• a voltage converting circuit to receive the third control signal from the second control circuit and convert the DC voltage from the DC voltage input terminal, and output the converted DC voltage to the system power supply of the motherboard, wherein the CPU receives the second control signal from the second control circuit and controls the motherboard operation according to the received second control signal.