'light-emitting diode driving apparatus and light-emitting diode driving operation controlling method'

摘要

A LED driving apparatus includes a rectifying circuit 2, first, second and third blocks 11,12 and 13, and first and second switching portions. The rectifying circuit 2 is connected to AC power supply, and rectifies AC voltage of the AC power supply to provide pulsating current voltage. Each block includes a plurality of LEDs. The first, second and third blocks 11,12 and 13 are serially connected to the output side of the rectifying circuit 2. The first switching portion switches ON/OFF of a first bypass path BP1 based on flowing current amount in the first block 11. The first bypass path BP1 bypasses the second block 12. The second switching portion switches ON/OFF of a second bypass path BP2 based on flowing current amount in the first and second blocks 11 and 12. The second bypass path BP2 bypasses the third block 13.