Fan speed control
US8868250B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 2010 |
| Grant date | Oct 21, 2014 |
| Priority date | — |
| Expiry date | Apr 19, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K7/20209
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
In one implementation, an environmental controller operates a cooling system in an electronic device. The environmental controller includes a closed loop control system for operating a cooling fan at a target speed. The environmental controller may select the target speed based on one or more temperature sensors. The environmental controller may select the target speed based on the speeds of additional fans or the fans may be controlled in unison. The closed loop control system includes a proportional weight. When a measured cooling fan speed deviates from the target speed by more than a threshold error value, the proportional weight is constant. As the measured cooling fan speed approaches the target speed, and the threshold error value is crossed, the proportional weight is variable. The variance may be a function of time such as a periodic stair step function.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.