Self-startup circuit for DC fan
US7205733B2 · kind B2 · utility
12Cited by
11References
14Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Oct 31, 2005 |
| Grant date | Apr 17, 2007 |
| Priority date | — |
| Expiry date | Oct 31, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P7/2885
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A self-startup circuit for a DC fan includes a voltage sampling device receiving a first control signal, a comparator, and a self-startup device. The comparator includes two input terminals and an output terminal. One input terminal is connected to an output terminal of the voltage sampling device. The self-startup device has a switching device and a diode connected in parallel. The self-startup device has an input terminal connected to the output terminal of the comparator, and outputs a second control signal for keeping the DC fan rotating even when the first control signal has a very low duty cycle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.