Ramp rate closed-loop control (RRCC) for PC cooling fans

Details Ramp rate closed-loop control (RRCC) for PC cooling fans Ramp rate closed-loop control (RRCC) for PC cooling fans

2006-01-30

2008-09-16

Leykin, Rita (Department: 2837)

Electricity: motive power systems

Positional servo systems

'reset' systems

C318S609000, C323S274000, C323S273000, C323S284000, C365S185190

Reexamination Certificate

active

07425812

ABSTRACT:
A fan controller may be integrated in silicon and may use an embedded microcontroller to implement a digital fan control algorithm. The microcontroller may continually monitor temperature and sample the speed of the controlled fan. The speed of the fan may be compared to RPM values fitted on a desired curve that is representative of the Temperature-versus-RPM function for the controlled fan. The fan control algorithm may be based on a ramp-rate closed-loop controller (RRCC), which may be operated to drive the fan to the desired speed at different rates, depending on the difference between the desired RPM and the actual RPM of the fan. The fan may also provide a Fan ID feedback signal to the microcontroller, which may use the Fan ID feedback signal upon system start-up to initialize the RRCC range settings and select the appropriate Temperature-versus-RPM function curve based on pre-determined values for the given fan.

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