Start-up circuit for DC fan
US7598690B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Oct 11, 2005 |
| Grant date | Oct 6, 2009 |
| Priority date | — |
| Expiry date | Mar 24, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P1/18
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A start-up circuit which decreases a start-up current and stabilizes running of a DC fan. The start-up circuit includes a digital-analog converter for convert a digital control signal from a control chip to an analog control signal, a voltage sampling device connected to an output terminal of the digital-analog converter, a comparator, a switching device for controlling start-up of the DC fan, and a feedback device adjusting current passing through the switching 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 switching device is connected to the output terminal of the comparator. An output signal of the switching device is inputted to the other input terminal of the comparator via the feedback device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.