Patent ID: 9696776
Date: 2017-07-04
CPC Classifications: G06F

Claim:
1. A switch circuit configured to control a first power supply unit and a second power supply unit to be switched between a first operation mode and a second operation mode, the switch circuit comprising: a voltage follower module electrically coupled to the first power supply unit and configured to receive a first control signal therefrom, and electrically coupled to the second power supply unit and configured to receive a second control signal therefrom; a comparison module electrically coupled to the first power supply unit and configured to receive the first control signal therefrom, and electrically coupled to the second power supply unit and configured to receive the second control signal therefrom, the comparison module further configured to compare a voltage of the first control signal and the second control signal with a reference voltage; and a switch module electrically coupled to the voltage follower module, the comparison module and a power supply; wherein in event that the voltage of the first control signal and the second control signal are both less than the reference voltage, the comparison module outputs a first signal to turn on the switch module, the power supply provides power for the voltage follower module through the switch module, the voltage follower module operates, the voltage of the first control signals and the second control signals are adjusted to be equal by the voltage follower module, the second power supply unit receives the first control signal output by the first power supply unit and the first power supply unit receives the second control signal output by the second power supply unit, and the first power supply unit and the second power supply unit work in the first operation mode; wherein in event that the voltage of the first control signals and the second control signal are both more than the reference voltage, the comparison module outputs a second signal to turn off the switch module, the voltage follower module is not powered by the power supply and does not operate, the second power supply unit does not receive the first control signal output by the first power supply unit and the first power supply unit does not receive the second control signal output by the second power supply unit, and the first power supply unit and the second power supply unit work in the second operation mode.