Application of maximum-efficiency tracking control for backlight module based on phase-locked loop technique

Author

Lin, Chang-Hua ; Lu, Ying ; Lo, Yu-Kang ; Pai, Kai-Jun

Author_Institution

Dept. of Comput. & Commun. Eng., St. John´´s & St. Mary´´s Inst. of Technol., xx

Volume

2

fYear

2004

fDate

6-9 Dec. 2004

Firstpage

641

Abstract

Maximum-efficiency tracking control applied in the backlight module is proposed in this paper. The backlight system incorporates a phase-locked loop as a feedback mechanism to promote both the system efficiency and stability. To overcome the drawbacks of the conventional electromagnetic transformer and miniaturize the backlight module, the piezoelectric transformer is adopted for driving the cold cathode fluorescent lamp. In addition, the PLL is utilized to track the optimal operating frequency of PT for achieving maximum output efficiency

Keywords

circuit feedback; flat panel displays; fluorescent lamps; phase locked loops; resonant invertors; PLL; backlight module; backlight system; cold cathode fluorescent lamp; electromagnetic transformer; feedback mechanism; maximum efficiency tracking control; optimal operating frequency; phase locked loop; piezoelectric transformer; resonant inverters; stability; Communication system control; Frequency; Impedance; Inductors; Phase locked loops; RLC circuits; Resonance; Resonant inverters; Tracking loops; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2004. Proceedings. The 2004 IEEE Asia-Pacific Conference on

Conference_Location

Tainan

Print_ISBN

0-7803-8660-4

Type

conf

DOI

10.1109/APCCAS.2004.1412959

Filename

1412959