Patent ID: 7783904
Filing Date: 2010-08-24
Classification: G06F

Abstract:
1. A circuit for preventing a computer from being powered on before a CPU of the computer has been properly installed, the circuit comprising: a power supply for providing power to the computer; a controller connected to the power supply configured for controlling the power supply, the controller having a sensing terminal for receiving a computer startup signal; a switch exposed to outside of the computer for convenient operation, the switch connected to the sensing terminal of the controller via a conducting path for sending the computer startup signal to the controller when the switch is triggered, wherein when the computer startup signal is sent to the sensing terminal of the controller, the controller controls the supply to provide power to the computer; and a switching device serially connected in the path, the switching device comprising a control terminal configured for sensing whether the CPU has been installed to control conduction of the switching device, which controls conduction of the path; wherein the computer startup signal is a low level voltage signal and generated when the switch is triggered, and the sensing terminal of the controller is connected to a voltage source via a resistor; the sensing terminal of the controller is connected to ground via the path, the switch and the switching device are set in the path between the controller and ground; the sensing terminal of the controller is further connected to a voltage source via a resistor; and the control terminal of the switching device is connected to another switching device, the another switching device comprises a first terminal connected to a voltage source via a resistor and to the control terminal of the switching device, a second terminal connected to ground, and a control terminal configured for sensing if the CPU is installed to control conduction of the another switching device, which controls the conduction of the switching device.