基于SG3525的液晶显示器平面背光源驱动电路设计  

Design of Driving Circuit for LCD Flat Backlighting Based on SG3525

作　　者：熊博[1] 刘震[1] 胡文波[1] 丁兴隆 唐李晟 姜凤山 

机构地区：[1]西安交通大学电子物理与器件教育部重点实验室,陕西西安710049 [2]彩虹集团公司技术中心,北京100085

出　　处：《液晶与显示》2009年第1期81-86,共6页Chinese Journal of Liquid Crystals and Displays

基　　金：教育部“春晖计划”科研合作项目(No.Z2004-1-61005)

摘　　要：介质阻挡放电平面荧光灯（Flat Fluorescent Lamps，FFL）是一种新型的平面光源，在液晶显示器背光源方面具有很好的应用前景。研制了一种基于PWM控制芯片SG3525的FFL驱动电路，采用一种反激逆变结构，以直流80～100V作为输入电压，产生出脉宽为3～4μs，幅值为1500-2000V的高压高频尖峰脉冲信号。本方案具有电路设计简单、灵活、效率高及成本低的优点。对FFL进行点屏试验的结果表明，设计出的电路可使FFL的平均亮度达到6000cd／m^2，亮度均匀性达到80％以上。Flat Fluorescent Lamps（FFL）with dielectric barrier discharge is a new type of flat light source, which has a cheerful prospect as backlight for LCD. In this paper, the pin structure and internal structure of SG3525 were introduced, moreover, based on this chip, a method of designing the driving circuit for FFL was proposed. A flyback inverter was adopted in this design. A series of peak pulses with a width of 3--4μs and an amplitude of 2 000-2 500 V were created, when the input direct current voltage was 80-100 V. The circuit has been proved on a FFL prototype, the results show that this design method has some advantages such as easy, flexible, high efficient and cheap. Moreover, the FFL＇s brightness of 6 000 cd/m^2 and brightness uniformity of above 80% can be achieved by the circuit.

关 键 词：平面荧光灯 介质阻挡放电 驱动电路 反激逆变电路 背光源 

分 类 号：TN27[电子电信—物理电子学]