Fan operating status sensing circuit
US4977375A · kind A · utility
25Cited by
1References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 18, 1989 |
| Grant date | Dec 11, 1990 |
| Priority date | — |
| Expiry date | Jan 18, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R19/15
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A direct current fan's status is monitored electronically using a current monitoring circuit. Normally, when a fan is running it exhibits a pulsating current input. The resulting alternating current signal is monitored via the current monitoring circuit to detect whether the fan is running or not.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.