Title :
The Elimination of the Leakage Current Effect for LCD Backlight Module Based on the Primary-side Control and the DPLL Technique
Author :
Lin, Chang-Hua ; Hung, Tsung-You ; Lu, Ying
Author_Institution :
St. John´´s Univ., Taipei
Abstract :
A new control method is proposed to eliminate the leakage current effect for backlight module in the LCD housing. First, a class D resonant inverter is employed to assess the system performance. Next, the primary-side control incorporating the DPLL technique is embedded in the backlight system, as a feedback mechanism, to reduce the influence of parasitic capacitance and to track an optimal operating frequency so that the leakage current effect is removed and, hence, the system efficiency and stability is improved. Complete mathematical analysis and design considerations are detailed. Experimental results agree with the theoretical predictions, and the parasitic capacitance in backlight system can be estimated by the derived mathematical models.
Keywords :
digital phase locked loops; leakage currents; liquid crystal displays; resonant invertors; DPLL technique; LCD backlight module; class D resonant inverter; digital phase locked loop; leakage current effect elimination; liquid crystal display housing; parasitic capacitance; primary-side control; Control systems; Feedback; Frequency; Leakage current; Mathematical analysis; Optimal control; Parasitic capacitance; Resonant inverters; Stability; System performance;
Conference_Titel :
Industrial Electronics and Applications, 2007. ICIEA 2007. 2nd IEEE Conference on
Conference_Location :
Harbin
Print_ISBN :
978-1-4244-0737-8
Electronic_ISBN :
978-1-4244-0737-8
DOI :
10.1109/ICIEA.2007.4318750
