Abstract: A cooling apparatus for an integrated circuit. The cooling apparatus comprises cooling fan means, a control circuit and heat pipe means. The control circuit determines a spinning speed of the cooling fan and an operation performance mode of the integrated circuit according to the load and the temperature of the integrated circuit, the ambient temperature and a reference temperature. Within a tolerable range of the output of adder means, the heating pipe means continues dispelling heat of the integrated circuit without turning on the cooling fan. While the output of the adder means exceed the tolerable range, the fan is turned on to enforce the heat dissipation.

Abstract: A computer system having a sensing circuit for detecting a user status and switching a computer accordingly as well as an automatic networking capability. As a user walks into a sensing area, the computer starts up automatically so that some waiting time can be saved. Similarly, when the user walks away from the sensing area, the computer shut down automatically so that some power can be saved. The computer system includes a signal generator that sends out a transmission signal for determining if a user is within a detectable region. A signal receiver emits an appropriate status signal after picking up the transmission signal from the detection region. The status signal is processed by various devices including an analogue/digital converter, a delay unit, a logic circuit and a microprocessor before arriving at a power-triggering mechanism to switch on or off the computer accordingly.

Abstract: A computer system having a sensing circuit for detecting a user status and switching a computer accordingly as well as an automatic networking capability. As a user walks into a sensing area, the computer starts up automatically so that some waiting time can be saved. Similarly, when the user walks away from the sensing area, the computer shut down automatically so that some power can be saved. The computer system includes a signal generator that sends out a transmission signal for determining if a user is within a detectable region. A signal receiver emits an appropriate status signal after picking up the transmission signal from the detection region. The status signal is processed by various devices including an analogue/digital converter, a delay unit, a logic circuit and a microprocessor before arriving at a power-triggering mechanism to switch on or off the computer accordingly.