TW336292B - Overheat warning system for preventing malfunction of cooling fan or heat sensitive resistance detector of a CPU - Google Patents

Abstract

An overheat warning system for preventing malfunction of a cooling fan or heat sensitive resistance detector of a CPU, which mainly uses a fan start-up detection signal wire to detect the occurrence of malfunctioning of a cooling fan or heat sensitive resistance detector in an electric machine, in which the detection method comprises the following steps: (A) first, the microprocessor in the electric machine determines whether the read resistance value of the heat sensitive resistance detector is a short circuit value or an open circuit value; (B) if yes, the microprocessor will send out a signal to the CPU indicating the malfunctioning of the heat sensitive resistance detector or its circuit component, and set the notebook computer into an OFF status; (C) otherwise, the microprocessor will detect that, after the temperature has been increased in the electric machine, whether the resistance of the heat sensitive resistance detector has reached the preset range; if the preset range has been reached, the microprocessor will be notified to start up the cooling fan; (D) next, the microprocessor will detect whether or not the electric potential of the fan start-up detection signal wire in the circuit has been converted; if the electric potential of the fan start-up detection signal wire has not been converted, it indicates that a component in the fan control circuit is bad or the fan is bad and not supplying power to the cooling fan; (E) after the fan has been started, the microprocessor starts timing. The center line L of the flat block being adjustable with the change of the center line 1 of the joint block.