Control circuit for a fan

Details Control circuit for a fan Control circuit for a fan

2006-12-15

2009-06-02

Masih, Karen (Department: 2837)

Electricity: motive power systems

Limitation of motor load, current, torque or force

C318S471000, C318S783000

Reexamination Certificate

active

07541762

ABSTRACT:
A control circuit for controlling rotational speed of a fan for an electronic device includes a temperature detecting unit for detecting an ambient temperature of the electronic device, and outputting a corresponding detection result; a control unit receiving the detection result from the temperature detecting unit, and outputting a corresponding control signal; and an operational unit receiving one or both of the control signal from the control unit and a pulse-width modulation (PWM) signal, and outputting a backup control signal for controlling the rotational speed of the fan, so that the fan can continue operating when needed, even if the PWM signal disappears.

REFERENCES:
patent: 2001/0024615 (2001-09-01), Chen
patent: 2003/0126473 (2003-07-01), Maciorowski et al.
patent: 2005/0035732 (2005-02-01), Horng et al.
patent: 2731151 (2005-10-01), None

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