Fan speed control device and method detailed description of...

Details Fan speed control device and method detailed description of... Fan speed control device and method detailed description of...

2006-11-30

2008-11-04

Masih, Karen (Department: 2837)

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Analog armature control

C388S907500, C318S461000

Reexamination Certificate

active

07447423

ABSTRACT:
A fan speed control device includes a controller, a switch and a voltage regulator. The controller detects a rotation speed signal of the fan to generate a first driving signal when the rotation speed signal is relatively higher than a predetermined rotation speed signal and generates the first driving signal and a second driving signal when the rotation speed signal is relatively lower than the predetermined rotation speed signal. The switch is electrically connected with the controller and receives the first driving signal. The voltage regulator, which is electrically connected with the controller, the switch and the fan, receives the second driving signal, and controls the rotation speed of the fan in accordance with the first driving signal and the second driving signal.

REFERENCES:
patent: 6453853 (2002-09-01), Hawkins et al.

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