Patent ID: 7847508

Claim:
A heat dissipation system for an electronic device, comprising: a base; a motor mounted on the base; a fan connected to the motor, speed of which is in a proportional relationship to an input voltage; a pulse width modulation speed control circuit capable of controlling the speed of the fan, receiving a pulse width modulation signal and outputting a voltage signal; a converter connected to a direct current power source, and capable of outputting a voltage signal, the converter comprising a regulator capable of regulating the voltage signal; a selection switch connected to the motor; a control element mounted on a surface of the base and connected to the switch and to the converter, wherein, when the control element is operated, the switch selectively enables the motor to receive output of the pulse width modulation speed control circuit or output of the converter, and when the motor is electrically connected to the converter, operation of the control element drives the regulator to modify the output voltage of the converter; and wherein, the control element is at least partially comprised of temperature sensitive color-changing material, the color of which differs from that of the control element's constituent material.