Brushless DC fan driver with overshoot voltage prevention and enhanced operational efficiency
US6140782A · kind A · utility
7Cited by
16References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 6, 1999 |
| Grant date | Oct 31, 2000 |
| Priority date | — |
| Expiry date | Apr 6, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P80/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A fan driver is provided to drive a DC brushless fan. The fan driver has a pulse generator for receiving a signal indicating the phase of a rotor in the fan from a Hall element and generating two pulse signals whose phases are inverted by about 180.degree.. Two driving units activated by the two pulse signals, respectively, are provided to alternatively apply current to the two coils thereby generating magnetic fields to rotate the rotor of the fan. Two switch elements are connected to the two driving units so that anti-electromotive voltage generated by one of the two coils can be transferred to the other coil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.