Control interface for customer replaceable fan unit

Details Control interface for customer replaceable fan unit Control interface for customer replaceable fan unit

1994-06-30

1995-07-25

Trammell, James P.

Boots, shoes, and leggings

364131, 364133, 361695, G05B 1500

Patent

active

054368278

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.

REFERENCES:
patent: 3935522 (1976-01-01), Tsay
patent: 4605883 (1986-08-01), Cockroft
patent: 4651072 (1987-03-01), Takata
patent: 5136465 (1992-08-01), Benck et al.
patent: 5249741 (1993-10-01), Bistline et al.
patent: 5325286 (1994-06-01), Weng et al.
Variable Air Cooling for Computer and/or Electronic Equipment, IBM Technical Disclosure Bulletin, vol. 32, No. 10A, Mar. 1990.

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