Method and apparatus for controlling rotational speed of fan
US7619380B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 24, 2007 |
| Grant date | Nov 17, 2009 |
| Priority date | — |
| Expiry date | Dec 24, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P7/29
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An apparatus for controlling rotational speed of a fan includes a sensor module, a single chip microcomputer (SCM) module, and a driving module. The sensor module collects rotational speed signals of a fan, and converts the rotational speed signals to voltage signals. The SCM module receives the voltage signals from the sensor module and compares the voltage signals with a predetermined rotational speed value stored in the SCM module, and outputs a control signal according to the comparison. The driving module receives the control signal from the SCM module, and outputs a pulse width modulation (PWM) signal to control the rotational speed of the fan.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.