Fan linear speed controller
US6380704B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | May 10, 1999 |
| Grant date | Apr 30, 2002 |
| Priority date | — |
| Expiry date | May 10, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B30/70
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A fan linear speed controller is disclosed, which controls the rotation speed of a fan by an external fan control voltage. The fan linear speed controller includes a temperature sensor unit, a linear speed control unit and a fault detection unit. The temperature sensor unit has a thermistor for detecting the ambient temperature of the fan to generate a thermally sensitive voltage. The linear speed control unit receives the external fan control voltage and the thermally sensitive voltage to generate an output voltage for driving the fan. The output voltage is proportional to the fan control voltage when the thermally sensitive voltage is lower than a preset threshold voltage and the fan control voltage is higher than a preset reference voltage. The fault detection unit receives the thermally sensitive voltage and a rotation speed signal generated by the fan to selectively produce a fault signal indicating that the rotation of the fan is abnormal or the ambient temperature of the fan is too high.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.