Patent ID: 6709111
Filing Date: 2004-03-23
Classification: G05D,H05K

Abstract:
In a cooling fan controller that controls a voltage for driving a cooling fan on the basis of a temperature detected by a temperature sensor, a cooling fan controller comprising:means for controlling the voltage for driving the cooling fan to a minimum voltage for cooling fan starting which is required to start the cooling fan when the cooling fan is started; and means for controlling, on the basis of a predetermined relationship between the detected temperature and the voltage for driving the cooling fan, the voltage for driving the cooling fan to a driving voltage value corresponding to the detected temperature after the cooling fan is started, the relationship between the detected temperature and the voltage for driving the cooling fan being determined such that the higher the detected temperature becomes, the larger the voltage for driving the cooling fan becomes in a range from a predetermined minimum voltage for cooling fan control which is lower than the minimum voltage for cooling fan starting to a predetermined maximum voltage for cooling fan control which is higher than the minimum voltage for cooling fan starting.