Fan speed detecting circuit

Details Fan speed detecting circuit Fan speed detecting circuit

1999-03-16

2000-10-10

Williams, Hezron

Electricity: measuring and testing

Electrical speed measuring

Including motor current or voltage sensor

318244, 327175, G01P 345

Patent

active

061305332

ABSTRACT:
A fan speed detecting circuit includes a resistor installed in the grounding line of the power circuit of the DC fan motor of a cooling fan, a capacitor, a diode connected between the resistor and the capacitor, and a comparator having an inverter terminal connected to the output end of the diode through the capacitor and a non-inverter terminal connected in parallel to the input end of the diode, wherein a transient pulse current is produced at the resistor upon operation of the DC fan motor, causing the comparator to output a pulse frequency wave indicative of the revolving speed of the DC fan motor.

REFERENCES:
patent: 4479115 (1984-10-01), Holzhauer
patent: 4839589 (1989-06-01), Heinle
patent: 4977375 (1990-12-01), Toth
patent: 5514977 (1996-05-01), Agiman
patent: 5811946 (1998-09-01), Mullin et al.
patent: 6060879 (2000-05-01), Mussenden

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