Patent ID: 6257832
Filing Date: 2001-07-10
Classification: F04D,G06F

Abstract:
A computer system in combination with a multiple fan system, comprising:a microprocessor mounted in a chassis;an input coupled to provide input to the microprocessor;a mass storage coupled to the microprocessor;a video controller coupled to the microprocessor;a memory coupled to provide storage to facilitate execution of computer programs by the microprocessor; anda multiple fan ventilating system mounted in the chassis, the multiple fan system including:at least two simultaneously operated fans, each fan being capable of operating as a constant speed fan or as an oscillating speed fan, one of the fans always being operated as a constant speed fan, and simultaneously, each other fan always being operated as an oscillating speed fan; anda fan controller capable of controlling a plurality of fans, the fan controller operating each of the oscillating speed fans within a different range of speed from each other oscillating speed fan, the controller providing an output voltage having a varying duty cycle and providing an oscillating fan speed profile having an oscillating speed range.