Patent ID: 8042350

Claim:
A cooling device controller for controlling a cooling device for reducing a temperature of a system, the cooling device controller comprising: a capacitor coupled to an output terminal for supplying an output voltage that depends on temperature; a first switch between a first input terminal and the output terminal, wherein a predetermined reference voltage is applied to the first input terminal and the capacitor is charged or discharged at the output terminal by the predetermined reference voltage when the first switch is turned on; a second switch between a second input terminal and the output terminal, wherein a temperature-sensing voltage is applied to the second input terminal and the capacitor is charged or discharged at the output terminal by the temperature-sensing voltage when the second switch is turned on, the temperature-sensing voltage varying according to information for a first sensed temperature; and a switch controller, operable to receive a first voltage waveform having a pulse width modulation with a duty ratio, the duty ratio dependent on information for a second sensed temperature, wherein the switch controller is operable to turn on and off the first switch and the second switch based on the first voltage waveform to generate the output voltage that depends on the predetermined reference voltage and the temperature-sensing voltage according to the duty ratio.