The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 25, 1995
Filed:
Jun. 30, 1994
Applicant:
Inventors:
Daniel D Gunn, Austin, TX (US);
William P Bunton, Austin, TX (US);
Assignee:
Tandem Computers Incorporated, Cupertino, CA (US);
Primary Examiner:
Int. Cl.
CPC ...
G05B / ;
U.S. Cl.
CPC ...
364187 ; 364131 ; 364133 ; 361695 ;
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.