Patent ID: 7398404

Claim:
A control device which controls power supply based on a power status comprising: a first switch; a second switch having a first end coupled to a first end of the first switch and a second end coupled to a computer host; a third switch having a first end coupled to the computer host and a second end coupled to a backup power; a fourth switch having a first end coupled to a second end of the first switch and a second end coupled to the second end of the third switch; a charging switch coupled to control ends of the second and third switches for controlling the second and third switches; and a judging circuit having a first input end for detecting a power status of a main power, a second input end for detecting a coupling status between the second input end and an I/O board, and an output end coupled to control ends of the first and fourth switches for controlling the first and fourth switches based on input signals received by the second input end of the judging circuit.