A Novel AC Direct Linear LED Driver with Unity Power Factor, Low Input Current THD, Low Light Flicker and Low Profile

A novel low light flicker and low-profile LED driver with Unity Power Factor, Low Input Current THD is proposed in this paper for AC direct lighting. To meet low flicker and low-profile requirement, inductor-less tapped linear driver with valley fill circuit architecture is proposed. To meet power factor and total harmonics regulations, multiplexing method and adapted LED current modulation scheme is proposed to improve input current waveform of tapped linear driver with valley fill circuit. Finally, simulations and prototype experiments verified the proposed LED driver.