A fan control system and method that maintains the operating temperature
of computer and electronic devices or components at about a predetermined
control level to minimize power consumption and audible noise. The fan
control system is a programmable closed loop system including a
temperature sensor, first and second fan controllers, and a fan/motor
assembly including a power converter, a motor, and a fan. The first fan
controller provides programmable acceleration/deceleration of the fan
during an initial fan spin up, and the second fan controller runs the fan
only as fast as necessary to keep the sensed temperature level of a
computer device as close as possible to the predetermined control level,
thereby minimizing the power consumption of the system and the audible
noise of the fan.