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

fYear

2007

fDate

Oct. 30 2007-Nov. 2 2007

Firstpage

1

Lastpage

4

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/TENCON.2007.4429136

Filename

4429136