Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title Design and Application of PFC Direct Drive Inverter for LCD-TV
Authors Tae-Seok Ko ; Yong-Joon Jung ; Sung-Soo Hong ; Sang-Kyu Han ; Byung-Jun Jang ; Young-Su Jang ; Seung-Ho Han ; 盧Chung-Wook Roh
DOI 10.6113/TKPE/2010.15.1.52
Page pp.52-59
ISSN 1229-2214
Keywords CCFL; Inverter; PFC direct drive
Abstract The conventional CCFL (Cold Cathode Fluorescent Lamp) inverter used in the backlight unit for LCD-TV, composed of the three power stage, can degrade the whole power conversion efficiency. In this paper, a novel scheme to drive the CCFL, composed only of the two power stage without using a dc/dc power stage, is proposed to enhance the whole power conversion efficiency. By adopting the proposed "4-in-1 Transformer", the current balance and the simultaneous ignition among the four CCFL lamp are assured with the one inverter circuit. The proposed scheme features the simple circuit structure, which can save the volume and the cost in the LCD backlight unit. Design considerations are discussed and design procedures are derived. Experimental results of the proposed scheme for 40" LCD-TV are presented to confirm the theoretical analysis.