Patent ID: 8253364
Filing Date: 2012-08-28
Classification: G06F,H05K

Abstract:
1. A heat-dissipating device for cooling an electronic system, comprising: a fan capable of being operated at more than one speed; a power source capable of supplying more than one level of output, each of which is capable of driving the fan to be operated at a corresponding speed; a thermometer capable of measuring temperature of the electronic system; and a controller defining more than one temperature range therein, each of which is associated with a corresponding level of output of the power source and each two adjacent of which overlap, wherein the controller being capable of detecting whether the measured temperature enters into a new temperature range by detecting whether the measured temperature exceeds any one of the limits of a temperature range associated with the current speed of the fan and, if yes, adjusting the level of output of the power source to drive the fan to be operated at a new speed which is associated with the new temperature range; wherein the overlap of each two adjacent temperature ranges covers the fluctuation of the temperature of the electronic system caused solely by the adjustment of the fan speed.