Control circuit for a cooling fan

Details Control circuit for a cooling fan Control circuit for a cooling fan

2007-08-14

2007-08-14

Donovan, Lincoln (Department: 2837)

Electricity: motive power systems

Plural diverse motor controls

Running-speed control

C318S471000, C318S472000, C318S473000

Reexamination Certificate

active

11280299

ABSTRACT:
A control circuit for a cooling fan is provided that adjusts input power and drive a cooling fan. The control circuit comprises a temperature detector for detecting temperature; a power controller for controlling driving power to the cooling fan based on the input power and supplying the driving power; a proportional electric power block supplying control power proportional to temperature variation of the detected; and a fixed electric power block supplying control power at a fixed level when the detected temperature is lower than a predetermined level. The control circuit for a cooling fan is configured to detect temperature variation and to operate with less noise by controlling rotational velocity of the cooling fan in proportion to variation in temperature variation to reduce noise generated when operating the cooling fan.

REFERENCES:
patent: 5718373 (1998-02-01), Kim et al.
patent: 6291956 (2001-09-01), Ku
patent: 6407525 (2002-06-01), Horng et al.
patent: 7038415 (2006-05-01), Nakamura et al.

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