Method and circuit configuration for detecting the rotational speed of electronically commutated fans
US6274991A · kind A · utility
9Cited by
16References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 21, 2000 |
| Grant date | Aug 14, 2001 |
| Priority date | — |
| Expiry date | Aug 21, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P7/2805
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method and a circuit configuration for detecting the rotational speed of electronically commutated fans include measuring maximum current gradients of current fluctuations caused by the fan on its power supply lines, and adapting an amplification range and switching threshold of a comparator used as an input stage for a pulse former.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.