Design and Analysis of a Piezoelectric Transformer-Based Half-Bridge Resonant Inverter for CCFL Backlight Modules

Author

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

Author_Institution

Dept. of Electron. Eng., NTUST, Taipei

Volume

2

fYear

2006

fDate

9-13 July 2006

Firstpage

892

Lastpage

896

Abstract

A half-bridge (HB) resonant inverter for driving a cold cathode fluorescent lamp (CCFL) backlight module with a piezoelectric transformer (PT) is analyzed in this paper. The resonant inductance of the HB inverter is expressed as a function of the load current, the load resistance the PT circuit parameters. Also, the trans-admittance of the PT-CCFL combination network is measured to track the resonant frequency of the PT which may be varied due to the temperature rise. The efficiency of the HB resonant inverter, the output power of the PT and the CCFL driving current are thus remained almost constant. Experiments show that the observed results match the theoretical analyses

Keywords

bridge circuits; fluorescent lamps; piezoelectric devices; power transformers; resonant invertors; CCFL backlight modules; cold cathode fluorescent lamp; half-bridge resonant inverter; load resistance; piezoelectric transformer; resonant frequency; resonant inductances; Cathodes; Electrical resistance measurement; Fluorescent lamps; Frequency measurement; Inductance; RLC circuits; Resonance; Resonant frequency; Resonant inverters; Temperature;

fLanguage

English

Publisher

ieee

Conference_Titel

Industrial Electronics, 2006 IEEE International Symposium on

Conference_Location

Montreal, Que.

Print_ISBN

1-4244-0496-7

Electronic_ISBN

1-4244-0497-5

Type

conf

DOI

10.1109/ISIE.2006.295753

Filename

4078203