Control circuit of rotational speed of a fan

Details Control circuit of rotational speed of a fan Control circuit of rotational speed of a fan

2007-07-17

2007-07-17

Donovan, Lincoln (Department: 2837)

Electricity: motive power systems

Switched reluctance motor commutation control

C318S471000, C318S799000, C318S723000, C318S812000, C323S237000

Reexamination Certificate

active

11242885

ABSTRACT:
A control circuit of rotational speed of a fan is provided, wherein by a switching of a switch unit, a PWM (Pulse Wide Modulation) unit can output a sampling pulse whose period is changing. A voltage is also changing following the period after taking a sample to an AC voltage by the control unit. The voltage after sampling serves as a working voltage of a load unit, so as to enable a fan device and a lamp device of the load unit to achieve effects of adjusting speed and brightness.

REFERENCES:
patent: 5691628 (1997-11-01), Martin

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