Fan Control Device and Fan Control Method and Cooling System Thereof

Abstract

The present invention discloses a fan control device for controlling a fan. The fan control device includes a barometer, for measuring an atmospheric pressure of an operating environment of the fan, and a maximum rotating speed setting unit, for setting a maximum operable rotating speed of the fan according to the atmospheric pressure.

What is claimed is: 
     
         1 . A fan control device for controlling a fan, comprising:
 a barometer, for measuring an atmospheric pressure of an operating environment of the fan; and   a maximum rotating speed setting unit, for setting a maximum operable rotating speed of the fan according to the atmospheric pressure.   
     
     
         2 . The fan control device of  claim 1 , wherein the maximum rotating speed setting unit sets the maximum operable rotating speed of the fan as a predefined low elevation maximum operable rotating speed when the atmospheric pressure is greater than a predefined atmospheric pressure;
 wherein an operating current of the fan is a maximum operating current when the maximum rotating speed setting unit drives the fan in the predefined low elevation maximum operable rotating speed.   
     
     
         3 . The fan control device of  claim 1 , wherein the maximum rotating speed setting unit sets the maximum operable rotating speed of the fan to be greater than a predefined low elevation maximum operable rotating speed when the atmospheric pressure is less than a predefined atmospheric pressure. 
     
     
         4 . The fan control device of  claim 3 , wherein the maximum rotating speed setting unit increases the maximum operable rotating speed of the fan until an operating current of the fan is equal to the maximum operating current;
 wherein the maximum rotating speed setting unit drives the fan in a high elevation maximum operable rotating speed with the maximum operating current, and sets the maximum operable rotating speed of the fan as the high elevation maximum operable rotating speed.   
     
     
         5 . The fan control device of  claim 4 , wherein the maximum rotating speed setting unit directly sets the maximum operable rotating speed of the fan as the high elevation maximum operable rotating speed when the atmospheric pressure is less than the predefined atmospheric pressure again. 
     
     
         6 . A fan control method for controlling a fan, comprising:
 measuring an atmospheric pressure of an operating environment of the fan; and   setting a maximum operable rotating speed of the fan according to the atmospheric pressure.   
     
     
         7 . The fan control method of  claim 6 , wherein the step of setting the maximum operable rotating speed of the fan according to the atmospheric pressure comprises:
 setting the maximum operable rotating speed of the fan as a predefined low elevation maximum operable rotating speed when the atmospheric pressure is greater than a predefined atmospheric pressure;   wherein an operating current of the fan is a maximum operating current when driving the fan in the predefined low elevation maximum operable rotating speed.   
     
     
         8 . The fan control method of  claim 6 , wherein the step of setting the maximum operable rotating speed of the fan according to the atmospheric pressure comprises:
 setting the maximum operable rotating speed of the fan to be greater than a predefined low elevation maximum operable rotating speed when the atmospheric pressure is less than a predefined atmospheric pressure.   
     
     
         9 . The fan control method of  claim 8 , wherein the step of setting the maximum operable rotating speed of the fan to be greater than the predefined low elevation maximum operable rotating speed comprises:
 increasing the maximum operable rotating speed of the fan until an operating current of the fan is equal to a maximum operating current;   wherein the maximum operating current drives the fan in a high elevation maximum operable rotating speed, and sets the maximum operable rotating speed of the fan as the high elevation maximum operable rotating speed.   
     
     
         10 . The fan control method of  claim 9 , further comprising:
 setting the maximum operable rotating speed of the fan as the high elevation maximum operable rotating speed directly when the atmospheric pressure is less than the predefined atmospheric pressure again.   
     
     
         11 . A cooling system, comprising:
 a fan; and   a fan control device for controlling the fan, comprising:
 a barometer, for measuring an atmospheric pressure of an operating environment of the fan; and 
 a maximum rotating speed setting unit, for setting a maximum operable rotating speed of the fan according to the atmospheric pressure. 
   
     
     
         12 . The cooling system of  claim 11 , wherein the maximum rotating speed setting unit sets the maximum operable rotating speed of the fan as a predefined low elevation maximum operable rotating speed when the atmospheric pressure is greater than a predefined atmospheric pressure. 
     
     
         13 . The cooling system of  claim 11 , wherein an operating current of the fan is a maximum operating current when the maximum rotating speed setting unit drives the fan in the predefined low elevation maximum operable rotating speed;
 wherein the maximum rotating speed setting unit sets the maximum operable rotating speed of the fan to be greater than a predefined low elevation maximum operable rotating speed when the atmospheric pressure is less than a predefined atmospheric pressure.   
     
     
         14 . The cooling system of  claim 13 , wherein the maximum rotating speed setting unit increases the maximum operable rotating speed of the fan until an operating current of the fan is equal to a maximum operating current;
 wherein the maximum operable rotating speed of the fan is the high elevation maximum operable rotating speed.   
     
     
         15 . The cooling system of  claim 14 , wherein the maximum rotating speed setting unit directly sets the maximum operable rotating speed of the fan as the high elevation maximum operable rotating speed when the atmospheric pressure is less than the predefined atmospheric pressure again.