Fan rotational speed controlling circuit

Details Fan rotational speed controlling circuit Fan rotational speed controlling circuit

2006-07-14

2009-02-24

Duda, Rina I (Department: 2837)

Electricity: motive power systems

Positional servo systems

Pulse-width modulated power input to motor

C318S811000, C318S461000, C388S934000

Reexamination Certificate

active

07495407

ABSTRACT:
A circuit for controlling rotational speed of a fan includes a sensor, a first chipset, and a second chipset. The sensor detects an ambient temperature and generates a corresponding temperature signal. The first chipset provides a pulse-width modulation signal to the fan for driving the fan, and receives a rotational speed signal from the fan. The second chipset defines a controlling relationship between the rotational speed of the fan and the temperature. The controlling relationship is that the temperature is partitioned into a plurality of temperature ranges and each of the temperature ranges corresponds to a rotational speed range. The temperature signal is transmitted from the sensor to the second chipset via the first chipset. The second chipset determines a rotational speed range according to the controlling relationship, and controls the first chipset to adjust the pulse-width modulation signal until the actual rotational speed of the fan is in the rotational speed range.

REFERENCES:
patent: 5929581 (1999-07-01), Van Brocklin et al.
patent: 6011371 (2000-01-01), Van Brocklin et al.
patent: 6643128 (2003-11-01), Chu et al.
patent: 6778938 (2004-08-01), Ng et al.
patent: 6810202 (2004-10-01), Hsu et al.

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