Method and apparatus for controlling rotational speed of fan

Details Method and apparatus for controlling rotational speed of fan Method and apparatus for controlling rotational speed of fan

2007-12-24

2009-11-17

Masih, Karen (Department: 2837)

Electricity: motive power systems

Plural diverse motor controls

Running-speed control

C318S434000, C318S471000

Reexamination Certificate

active

07619380

ABSTRACT:
An apparatus for controlling rotational speed of a fan includes a sensor module, a single chip microcomputer (SCM) module, and a driving module. The sensor module collects rotational speed signals of a fan, and converts the rotational speed signals to voltage signals. The SCM module receives the voltage signals from the sensor module and compares the voltage signals with a predetermined rotational speed value stored in the SCM module, and outputs a control signal according to the comparison. The driving module receives the control signal from the SCM module, and outputs a pulse width modulation (PWM) signal to control the rotational speed of the fan.

REFERENCES:
patent: 6380704 (2002-04-01), Chin
patent: 2005/0236571 (2005-10-01), Suzumura
patent: 2005/0244263 (2005-11-01), Hardt et al.
patent: 2454987 (2001-10-01), None
patent: 2876852 (2007-03-01), None

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