A high-input-voltage backlight module driver for multi-lamp LCD panels

作者：Lo Yu Kang^*; Pai Kai Jun; Wu Kuan Hung; Chiu Huang Jen

来源：International Journal of Circuit Theory and Applications, 2011, 39(5): 533-542.

DOI：10.1002/cta.639

• half-bridge resonant inverter
• cold cathode fluorescent lamp
• LCD backlight module
• power factor correction

A half-bridge (HB) resonant inverter for driving a backlight module with multiple cold cathode fluorescent lamps (CCFLs) is proposed. Conventionally, a backlight module driving inverter is designed to operate with a low-input DC voltage. Therefore, a buck converter is required to step down the high-output DC voltage of a power factor correction (PFC) pre-regulator. The circuit cost is high and the conversion efficiency is low. In this letter, a high-input-voltage HB resonant inverter with only one transformer is used to drive multiple lamps. Analysis and design considerations are discussed in detail. Simulations and experimental results are close to the theoretical prediction.

• 出版日期2011-5