Control interface for customer replaceable fan unit
US5436827A · kind A · utility
63Cited by
6References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 30, 1994 |
| Grant date | Jul 25, 1995 |
| Priority date | — |
| Expiry date | Jun 30, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B9/03
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A fault-tolerant control and monitoring system for fan assemblies used in electronic equipment. The fan control and monitoring system of the present invention reduces the probability of high temperature damage due to power failure by using a power mixing circuit that provides redundant power to the fans. The system includes means for detecting faults in the power mixing circuit. The system of the present invention further includes means for measuring the exact speed of the fans, as well as means for finer control of fan speed. Physical presence of fan unit is detected without additional pin requirements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.