蔡建军

摘 要： 由于动态光调节下的数字式LED驱动电源设计不完善，使动态光对LED的调节无法达到预期效果，而嵌入式系统则可有效提升LED驱动电源各项性能。为此，设计基于嵌入式系统的动态光调节下数字式LED驱动电源。其中的A/D采集模块对动态光调节下的数字式LED数据进行采集、整流、滤波和A/D转换，得到A/D采样数据并传输到驱动电路。驱动电路采用嵌入式设计对A/D采样数据进行优化，进而实现对LED发光的合理控制和动态光对数字式LED的有效调节。C8051F021芯片是基于嵌入式系统的动态光调节下数字式LED驱动电源的“管理者”，其管理流程图于软件中给出。软件还对A/D采集模块的数据采集语言进行了设计。实验结果表明，所设计的数字式LED驱动电源驱动性能强、电源转换效率高。

关键词： 动态光调节； 数字式LED驱动电源； 嵌入式设计； C8051F021

中图分类号： TN86?34； TP303.3 文献标识码： A 文章编号： 1004?373X（2017）10?0103?04

Abstract： The adjustment of LED controlled by dynamic light can′t achieve the expected effect due to the imperfect design of digital LED driving power supply adjusted by dynamic light， but the embedded system can improve the performances of LED driving power supply effectively. An embedded system based digital LED driving power supply controlled by dynamic light was designed. The A/D acquisition module performs the acquisition， rectification， filtering and A/D conversion of data of digital LED adjusted by dynamic light to get the A/D sampling data， and transfer it to the driving circuit. The embedded design is adopted in the driving circuit to optimize the A/D sampling data， so as to control the LED lighting reasonably and regulate the digital LED with dynamic light effectively. The C8051F021 chip is the "manager" of the embedded system based digital LED driving power supply under dynamic light control. Its management flow chart is given in the third part of this paper. The data acquisition language of A/D acquisition module was design also in the third part. The experimental results show that the designed digital LED driving power supply has strong driving performance and high power conversion efficiency.

Keywords： dynamic light control； digital LED driving power supply； embedded design； C8051F021

0 引 言

现如今，数字式LED以其低耗、显示清晰、寿命长等优点，在家用电器的显示配件方面占据了主导地位。动态光调节是一种能够有效缩减数字式LED显示屏漏光现象、增强显示效果的方法，但由于动态光调节下的数字式LED驱动电源的设计不完善，使动态光对LED的调节无法达到预期效果，这已成为科研组织的研究难题[1?4]。嵌入式是一种以应用为核心、以电子信息技术为根基的计算机系统，其能够调控软硬件的灵活性，进而提升LED驱动电源的各项性能[5?6]。为此，利用嵌入式系统，设计动态光调节下的数字式LED驱动电源，增强数字式LED驱动电源的驱动性能和转换效率，实现动态光对数字式LED的调节效果。……