System, method, and computer-readable medium for reduction of commutation-related acoustic noise in a fan system
US7279857B2 · kind B2 · utility
7Cited by
8References
30Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 27, 2003 |
| Grant date | Oct 9, 2007 |
| Priority date | — |
| Expiry date | Dec 21, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S388/911
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for reducing commutation-related acoustic noise in a fan system is provided. A constant frequency periodic signal is generated and a fan commutation event is synchronized with a zero level value of the constant frequency periodic signal. A system for controlling a direct current fan is provided. The system comprises a signal generator adapted to produce a periodic signal of a constant frequency and a phase-locked loop. A zero level value of the periodic signal is synchronized with a commutation event of the fan.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.