Design of Class E Backlight Module with Optimal Operating Frequency Tracking Mechanism

摘要：

This paper proposes a new control approach for tracking the optimal operating frequency of a backlight inverter. First, a class E backlight module is introduced to simplify the backlight circuit and to raise the system efficiency. A piezoelectric transformer (PT) is used to drive the cold cathode fluorescent lamp (CCFL) to eliminate the drawbacks of a conventional transformer and to reduce the dimension of the backlight module. Next, phase-locked loop (PLL) technique is embedded in the backlight system, as a feedback mechanism, to track the optimal operating frequency of the PT so that the PTs temperature effect is removed and, hence, the system efficiency and stability is improved. The feedback variable proposed is a phase difference rather than lamp current amplitude traditionally used. The complete analysis and design considerations are detailed.

作者: Chang-Hua LIN Juing-Huei SU Chien-Yeh HO

作者单位: St.Johns University, Taiwan Lunghwa University of Science and Technology, Taiwan

会议类型: 国际会议

会议名称: 2nd IEEE Conference on Industrial Electronics and Applications(ICIEA 2007)(第二届IEEE工业电子与应用国际会议)

会议地点: 哈尔滨

会议语种:英文

在线出版日期: 2007-05-23（万方平台首次上网日期，不代表论文的发表时间）