Method and apparatus for controlling a variable speed fan in...

Details Method and apparatus for controlling a variable speed fan in... Method and apparatus for controlling a variable speed fan in...

2006-03-14

2006-03-14

Masih, Karen (Department: 2837)

Electricity: motive power systems

Plural diverse motor controls

Running-speed control

C318S732000

Reexamination Certificate

active

07012390

ABSTRACT:
An improved variable speed fan controller for use in devices such as laser printers. The controller automatically adjusts its output signal to fans such that a fan quickly settles into an appropriate operating speed, even if the fan has been newly installed into the equipment. The controller can store values in non-volatile memory, if desired, to keep track of recent changes in the fan's operating parameters and corresponding control signal values. The controller is able to control relatively inexpensive fans that don't necessarily operate at a predictable fan rotating speed under repeatable conditions and control signals, by controlling the fan to an initial or predetermined rotating speed; if the fan isn't running within a suitable range of rotational speeds, then determining whether a fine or coarse adjustment should be made to the fan's rotational speed. The controller makes appropriate adjustments until the fan's rotational speed is within acceptable operating tolerances.

REFERENCES:
patent: 5696432 (1997-12-01), Poeppel

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