Patent ID: 7988302

Claim:
A cooling system for cooling down a heat source of a projection device, comprising: a fan; and a control module configured for supplying a first voltage to the fan for a first duration after the projection device is powered off, and a second voltage to the fan for a second duration successive to the first duration, the first duration being a preset length of time, the second duration is a preset length of time, the second voltage being greater than the first voltage, and the control module comprising: a first driving unit configured to supply the first voltage; a second driving unit configured to supply the second voltage; a processing unit; a first timing unit connected to the processing unit, and configured for timing the first duration; and a second timing unit connected to the processing unit, and configured for timing the second duration; wherein the processing unit is configured to trigger the first driving unit during the first duration, and trigger the second driving unit and turn off the first driving unit after the first timing unit finishes timing the first duration.