| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a light driving apparatus whose driving current for LED lighting is stable. <P>SOLUTION: The light driving apparatus includes: a rectifier circuit 110; a transformer circuit 120 transforming a magnitude of a voltage outputted from the rectifier circuit 110 and outputting it; a power factor compensation circuit 130 compensating a power factor of a power source 100; a smoothing circuit 140 smoothing the voltage outputted from the transformer circuit 120 and outputting it; a constant-current driving circuit 150 controlling an LED current so that a constant driving current flows in an LED module 10; a dimming control circuit 160 controlling dimming; a photo-coupler 170 applying a feedback voltage to the power factor compensation circuit 130; a first photo-coupler driving circuit 190 for feeding back an output voltage from the LED module 10 to apply it as a driving voltage of the photo-coupler 170; and a second photo-coupler driving circuit 200 for feeding back a voltage to be supplied to the LED module 10 to apply it as a driving voltage of the photo-coupler 170. <P>COPYRIGHT: (C)2013,JPO&INPIT |
