Fan motor speed control circuit

Details Fan motor speed control circuit Fan motor speed control circuit

2006-05-02

2006-05-02

Martin, David (Department: 2837)

Electricity: motive power systems

Plural diverse motor controls

Running-speed control

C318S471000, C318S472000, C318S473000, C318S641000, C388S934000

Reexamination Certificate

active

07038408

ABSTRACT:
A fan motor speed control circuit includes a driving circuit, a voltage division circuit, and a speed modulator. The voltage division circuit has a first transistor and a plurality of resistors and is connected between a voltage source and the driving circuit. The speed modulator has a second transistor and a plurality of parallel resistors and is connected between the voltage division circuit and the driving circuit. The current of the fan motor speed control circuit flows through a first path under a first input voltage generated from the voltage source and through a second path under a second input voltage larger than the first one; the parallel resistors are in the second path such that the current value passing through the driving circuit varies according to the resulting resistance value of the parallel resistors.

REFERENCES:
patent: 5606232 (1997-02-01), Harlan et al.
patent: 6135718 (2000-10-01), Yang
patent: 6188187 (2001-02-01), Harlan
patent: 6239991 (2001-05-01), Ajro et al.
patent: 6650074 (2003-11-01), Vyssotski et al.
patent: 6779981 (2004-08-01), Huang et al.
patent: 2004/0174131 (2004-09-01), Sivertsen
patent: 2004/0247449 (2004-12-01), Ma et al.

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