Patent ID: 8432113
Filing Date: 2013-04-30
Classification: H02P

Abstract:
1. A brushless fan motor control circuit assembly, comprising: a high-frequency filter circuit comprising a resistor-inductor filter, an RV surge protector and a filter capacitor for removing high frequency noises; a rectifier circuit comprising a plurality of diodes for rectifying AC power supply into DC power supply; a power factor enhancing circuit comprising a plurality of diodes and two capacitors for enhancing power factor subject to alternative charging and discharging operations of said two capacitors to make a compensation; a current-limit and voltage regulation circuit comprising a transistor, a Zener diode, a photo coupling crystal, a variable resistor, a high frequency coil, a constant current driver IC, a field effect transistor and a current sensing resistor, said constant current driver IC comprising a current control pin and a voltage control pin for controlling on/off of said field effect transistor to limit the electric current passing therethrough to a load and to regulate the voltage to a constant level; and a brushless fan motor driving circuit comprising a motor driver IC electrically coupled with a brushless motor for driving said brushless motor.