Title :
Digital dimming control of CCFL drive system using pulse density modulation technique
Author :
Liu, Yi-Hwa ; Wang, Shun-Chung ; Luo, Yi-Feng
Author_Institution :
Nat. Taiwan Univ. of Sci. & Technol., Taoyuan
fDate :
Oct. 30 2007-Nov. 2 2007
Abstract :
In this paper, a digital dimming controller for the CCFL drive system is presented. The proposed digital controller utilizes pulse density modulation (PDM) technique to adjust the output power. In order to verify the correctness of the proposed method, a FPGA (Field Programmable Gate Array)-based CCFL drive system is also built and tested. The overall system power efficiency is approximately 85%. Comparing to low frequency dimming (LFD) methods, the proposed system can reduce the voltage spike by over 15%.
Keywords :
field programmable gate arrays; invertors; light sources; power convertors; CCFL backlighting; CCFL drive system; FPGA; digital dimming controller; field programmable gate array; low frequency dimming methods; output power; pulse density modulation technique; switch-mode full-bridge inverter power stage; Control systems; Digital control; Digital modulation; Field programmable gate arrays; Lamps; Pulse modulation; Pulse width modulation; Pulse width modulation inverters; Resonance; Zero voltage switching;
Conference_Titel :
TENCON 2007 - 2007 IEEE Region 10 Conference
Conference_Location :
Taipei
Print_ISBN :
978-1-4244-1272-3
Electronic_ISBN :
978-1-4244-1272-3
DOI :
10.1109/TENCON.2007.4429136
