A low-temperature driving scheme of EEFLS inverter for LCD TV backlights

Author

Cho, Tae-Seung ; Jung, Jin-Woo ; Lee, Dong-Myung ; Choi, Eun Ha ; Cho, Guangsup

Author_Institution

PDP Div., Samsung SDI Co., Ltd., Cheonan, South Korea

Volume

55

Issue

2

fYear

2009

fDate

5/1/2009 12:00:00 AM

Firstpage

699

Lastpage

706

Abstract

A new low-temperature driving method of EEFLs (external electrode fluorescent lamps) inverter for LCD TV backlights is proposed. The proposed driving scheme achieves a zero current switching (ZCS) of lower switches and dramatically reduces the temperature of the transformer at which the power loss mainly occurs. Moreover, the capacitance of EEFLs is calculated by the QV Lissajous analysis method and then the optimal switching interval for a low heating loss of the transformer is determined. To investigate the feasibility of the proposed driving method, various experimental results using a prototype 17-inch LCD TV backlight with 12 EEFLs are presented.

Keywords

fluorescent lamps; invertors; liquid crystal displays; television applications; zero current switching; QV Lissajous analysis method; ZCS; external electrode fluorescent lamps inverter; low heating loss; low-temperature driving scheme; optimal switching interval; size 17 in; zero current switching; Capacitance; Electrodes; Fluorescent lamps; Heating; Inverters; Prototypes; Switches; TV; Temperature; Zero current switching; Driving circuit, driving method, EEFL, fullbridge; inverter, LCD backlight, low temperature, trapezoidal; waveform;

fLanguage

English

Journal_Title

Consumer Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0098-3063

Type

jour

DOI

10.1109/TCE.2009.5174442

Filename

5174442