Circuit for controlling rotation speed of computer fan
US7702223B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 24, 2008 |
| Grant date | Apr 20, 2010 |
| Priority date | — |
| Expiry date | Oct 18, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F1/206
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A circuit for controlling rotation speed of a computer fan includes a fan header for connecting to a 4-pin fan or a 3-pin fan, a jumper device, an amplifier, and a controller. The jumper device has a first pin for receiving a controlling signal, and connected to a first power source, a second pin connected to the fan header, and a third pin connected to the first power source. The amplifier has an input terminal connected to the third pin of the jumper device via an integrator. The controller has a first terminal connected to an output terminal of the amplifier, a second terminal connected to a second power source, and a third terminal connected to the fan header and connected to a positive input terminal of the amplifier via a resistor. The first pin of the jumper device is selectively connected to the second or third pin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.