Title :
Design and implementation of high frequency AC-LED driver with digital dimming
Author :
Kuo, Chao-Lung ; Liang, Tsorng-Juu ; Chen, Kai-Hui ; Chen, Jiann-Fuh
Author_Institution :
Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan
fDate :
May 30 2010-June 2 2010
Abstract :
In this paper a two-stage high frequency AC-LED driver is designed and studied. The front-stage is a boost power-factor correction (PFC) circuit and the rear-stage is a halfbridge series resonant inverter. The lighting characteristics of high frequency AC voltage driving LEDs, and the effect of LED to half-bridge resonant circuit are discussed. The proposed design uses the digital dimming control to reduce LED chromaticity shift, and connect the LEDs as a full-bridge rectifier to simplify the current sensing circuit. An 80-W high frequency AC-LED driver with universal voltage input (90~264 Vrms) is implemented to verify the design. Experimental results show that the variation of chromaticity coordinates (u´, v´) from brightness 100% to 20% is within 0.0023.
Keywords :
bridge circuits; driver circuits; light emitting diodes; rectifiers; resonant invertors; AC-LED driver; boost power-factor correction circuit; current sensing circuit; digital dimming control; full-bridge rectifier; half-bridge series resonant inverter; lighting characteristics; power 80 W; Brightness; Digital control; Driver circuits; Frequency; LED lamps; Light emitting diodes; RLC circuits; Rectifiers; Resonant inverters; Voltage; Digital dimming; High frequency AC-LED;
Conference_Titel :
Circuits and Systems (ISCAS), Proceedings of 2010 IEEE International Symposium on
Conference_Location :
Paris
Print_ISBN :
978-1-4244-5308-5
Electronic_ISBN :
978-1-4244-5309-2
DOI :
10.1109/ISCAS.2010.5537751
