公开(公告)号：US20110051357A1

公开(公告)日：2011-03-03

申请号：US12549542

申请日：2009-08-28

Applicant: DEREK ORR ,  STUART J. MCGURNAGHAN

Inventor： DEREK ORR ,  STUART J. MCGURNAGHAN

IPC: G06F1/20

CPC classification number: G06F1/20

Abstract: A system and method of spread-spectrum fan control for an air-cooled system is provided for reducing the vibrational and acoustical noise associated with the air-cooled system. The method includes generating a first control signal that controls a blade-passing frequency of a first cooling fan and a second control signal that controls a blade-passing frequency of a second cooling fan, wherein the first and second control signals may be pulse width modulated (“PWM”) signals. One or more noise generators independently vary duty cycles for the first and second PWM signals within a range around respective first and second blade-passing frequency set points. As a result, the blade-passing frequencies for the first and second cooling fans are independently and randomly modulated within a range around the respective first and second blade-passing frequency set points.

Abstract translation: 提供了一种用于风冷系统的扩频风扇控制的系统和方法，用于降低与风冷系统相关联的振动和声音噪声。 该方法包括产生控制第一冷却风扇的叶片通过频率的第一控制信号和控制第二冷却风扇的叶片通过频率的第二控制信号，其中第一和第二控制信号可以是脉宽调制 （“PWM”）信号。 一个或多个噪声发生器在相应的第一和第二叶片通过频率设定点的范围内独立地改变第一和第二PWM信号的占空比。 结果，第一和第二冷却风扇的叶片通过频率在相应的第一和第二叶片通过频率设定点周围的范围内独立随机调制。