摘要
本文通过对一款66 cmLCD显示器的LED直下式背光源的主要技术要求和设计方法进行分析,论述通过对电流的取样、反馈去控制PWM的脉冲宽度来调节输出电压,进而实现对LED的供电恒定电流。测试结果表明:该电路通过减小输入功率来实现电流控制,符合节能低耗的原则。
This paper firstly analyzes the key technical requirements and design methods of a 26-inch LCD with direct LED backlight and then depicts the regulation of out voltage with current sampling and feedback of PWM to supply the constant current LED power.The test results indicate that this circuit by reducing input power to achieve current control is conformity with the principle of energy saving and low consuming.
出处
《成都电子机械高等专科学校学报》
2010年第4期17-20,共4页
Journal of Chengdu Electromechanical College
关键词
LED
稳压开关电源
恒流源
背光源
LED
regulated switching power supply
constant current source
backlight
