Patent ID: 7196485
Filing Date: 2007-03-27
Classification: F24F,H02P

Abstract:
1. A universal low-power ceiling fan controller, installed in a ceiling fan casing, comprising: a brushless DC motor, installed in said ceiling fan casing for driving vanes of said ceiling fan; a driving device coupled to said brushless DC motor for controlling power supplied thereto; a power supply having an input coupled to an electric power source and an output coupled to said driving device for supplying a stable voltage thereto, said power supply including a power factor correction circuit for compensating for an inductance of said brushless DC motor; a microcontroller, coupled to said power supply and said driving device for providing the functions of processing, analyzing, controlling, detecting and transmitting of signals, said microcontroller providing instruction signals to said driving device for controlling operation of said brushless DC motor; a remote control device including a transmitter and a receiver coupled to said microcontroller for transmission of a data signal to said microcontroller by a wireless transmission method, said receiver converting said data signal for input to said microcontroller; a feedback device coupled to said microcontroller and having at least three Hall components separately installed at predetermined positions of said brushless DC motor for continuous magnetic sensing of a position change and feeding back a sensed signal to said microcontroller to determine a speed of said brushless DC motor; such that after said microcontroller receives and analyzes a signal from said remote control device, said driving device drives said brushless DC motor to rotate and operate with said position signal of said feedback device and continues sampling and feeding back said signal to said microcontroller to determine and conduct an automatic speed compensation, so as to maintain a constant speed of the rotation of said vanes of said ceiling fan while reducing electric power consumption.