Complementary fan rotational speed control method and apparatus

Details Complementary fan rotational speed control method and apparatus Complementary fan rotational speed control method and apparatus

2005-04-05

2005-04-05

Masih, Karen (Department: 2837)

Electricity: motive power systems

Limitation of motor load, current, torque or force

C318S268000, C388S903000

Reexamination Certificate

active

06876164

ABSTRACT:
A complementary fan rotational speed control method and apparatus for simultaneously monitoring the rotation speeds of two or more fans includes a control unit to output pulse width modulation (PWM) control power supply to activate operation of a first fan and a second fan. The first and the second fan deliver rotation pulse signals to the control unit. When the control unit detects the rotation speed of either the first or second fan decreases, it actuates other fan to increase rotation speed and issues a warning signal to secure cooling effect and increase the service life of the fans.

REFERENCES:
patent: 5977733 (1999-11-01), Chen
patent: 6398505 (2002-06-01), Sekiguchi
patent: 20020187059 (2002-12-01), Gold et al.
patent: 20030115887 (2003-06-01), Currie et al.

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