Sensor for monitoring fan operation in a PC or PC based system

Details Sensor for monitoring fan operation in a PC or PC based system Sensor for monitoring fan operation in a PC or PC based system

1993-11-17

1995-09-05

Ro, Bentsu

Electricity: motive power systems

Limitation of motor load, current, torque or force

361 23, 361 31, H02H 708, H02H 720

Patent

active

054481430

ABSTRACT:
A sensor circuit for monitoring the operation of a fan in an electronic device includes a current sensor that produces a voltage signal proportional to the magnitude of the current flowing through the fan. The proportional voltage signal is filtered to extract an rms dc signal that then is compared with a minimum and maximum voltage threshold in two voltage comparators. If the voltage of the filtered signal exceeds the maximum threshold value, or is less than the minimum threshold value, a fan failure signal is generated and transmitted to an external monitoring unit. The sensor circuit can be implemented with a standard two-wire fan and interface connector.

REFERENCES:
patent: 3809960 (1974-05-01), Jossic
patent: 4030012 (1977-06-01), Buhler
patent: 4035692 (1977-07-01), Luy et al.
patent: 4290000 (1981-09-01), Sun
patent: 4558264 (1985-12-01), Weischedel
patent: 4752851 (1988-06-01), Ritter
patent: 4901181 (1990-02-01), Miyanaga et al.

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