Patent ID: 7918564

Claim:
A cooling system for dissipating heat generated by at least one heat source device in a projector, the cooling system comprising: at least one fan for generating an air flow to dissipate the heat generated by the heat source device; a thermal sensor disposed in the projector for sensing a temperature of the projector, wherein the thermal sensor is disposed between a light source device and a power supply system; and a control module disposed in the projector for controlling a rotation speed of the fan according to a first predetermined temperature and a second predetermined temperature, the first predetermined temperature being higher than the second predetermined temperature, the control module controlling the fan to increase the rotation speed at a sensing temperature of the projector being higher than the first predetermined temperature and the control module controlling the fan to decrease the rotation speed at the sensing temperature being lower than the second predetermined temperature, wherein the control module further comprises a voltage control module for controlling a voltage provided from the power supply system of the projector to increase or decrease the rotation speed of the fan according to a relationship between voltage and time, and the control module is for determining a relationship between the increased/decreased voltage and a maximum voltage/a minimum voltage to maintain the voltage controlling the fan between the minimum voltage and the maximum voltage, wherein if the sensing temperature is between the first predetermined temperature and the second predetermined temperature, the voltage provided from the power supply is not changed.