Fan speed controlling circuit

Details Fan speed controlling circuit Fan speed controlling circuit

2006-05-11

2008-10-28

Nguyen, Matthew V (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C318S268000

Reexamination Certificate

active

07443151

ABSTRACT:
A fan speed controlling circuit includes a temperature sensing circuit for transforming a temperature signal to a voltage signal, a reference voltage providing circuit for outputting a reference voltage, and a voltage amplifying and comparing circuit. The voltage amplifying and comparing circuit includes a negative terminal receiving the voltage signal from the temperature sensing circuit and a positive terminal receiving the reference voltage from the reference voltage providing circuit. A reactive circuit is connected to the voltage amplifying and comparing circuit. The reactive circuit produces a control signal according to a voltage signal output by the voltage amplifying and comparing circuit. The reactive circuit includes a driving component controlled by the control signal for providing a driving current to a fan.

REFERENCES:
patent: 4382218 (1983-05-01), McVey
patent: 5942866 (1999-08-01), Hsieh
patent: 6400045 (2002-06-01), Hosokawa et al.
patent: 6879120 (2005-04-01), Xi
patent: 7323837 (2008-01-01), Wang

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