System and method for controlling the rotating speed of a fan

Details System and method for controlling the rotating speed of a fan System and method for controlling the rotating speed of a fan

2007-06-26

2007-06-26

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Automatic and/or with time-delay means

Responsive to thermal conditions

C165S104330, C361S695000

Reexamination Certificate

active

11308973

ABSTRACT:
A method for controlling the rotating speed of a fan is disclosed. The method includes the steps of: reading a standard temperature Tcof a central processing unit (CPU); reading a thermal diode's temperature Tdand a system ambient temperature Ta; comparing Tdwith a minimum temperature Tl, such that the fan begins processing the heat of the CPU begins; if Td>Tl, increasing pulse-width modulation (PWM) duty cycle of the fan to 100%; if Td<=Tl, comparing a critical temperature T0with Ta; if Ta>T0, increasing PWM fan duty cycle to 100%; if Ta<=T0, setting the fan duty cycle at 40%; sending the PWM fan duty cycle to a fan speed controller.

REFERENCES:
patent: 6470289 (2002-10-01), Peters et al.
patent: 6601168 (2003-07-01), Stancil et al.
patent: 6813150 (2004-11-01), King et al.
patent: 6906901 (2005-06-01), Liu
patent: 6935130 (2005-08-01), Cheng et al.
patent: 6996333 (2006-02-01), Lin
patent: 7167778 (2007-01-01), Yazawa et al.

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