Patent ID: 7721561

Claim:
A method for controlling fan operation in a system having a fan, the method comprising: selecting a fan operation mode based on at least two system operation modes; detecting at least one internal temperature of the system as a whole or component devices thereof; controlling operation of the fan based on the selected fan operation mode and the detected at least one internal temperature, including: comparing the detected at least one internal temperature with a preset temperature; and if the detected temperature is lower than the preset temperature, stopping a preset fan operation speed; detecting again the internal temperature of the system while the operation of the fan is off and comparing the detected internal temperature with the preset temperature; if the detected internal temperature is higher than the preset temperature, forcing the system to enter a first specific mode; after the system is changed into the first specific mode, detecting again the internal temperature of the system and comparing the detected internal temperature with the preset temperature; if the detected internal temperature is higher than the preset temperature, forcing the system to enter a second specific mode; after the system is changed into the second specific mode, detecting again the internal temperature of the system and comparing the detected internal temperature with the preset temperature; if the detected internal temperature is higher than the preset temperature, driving the fan normally; and if the internal temperature detected while the operation of the fan is off is lower than the preset temperature, maintaining the power-off state; and if the internal temperature detected after the system is changed into the first specific mode is lower than the preset temperature, maintaining the first specific mode, wherein an operation speed of the fan is controlled with at least one of a speed up status having ˜3500 rpm, a normal status having ˜2500 rpm, or a slow status having ˜150 rpm.