System for minimizing mechanical and acoustical fan noise coupling
US8292593B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 28, 2009 |
| Grant date | Oct 23, 2012 |
| Priority date | — |
| Expiry date | Dec 16, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F1/20
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.