电工技术学报2018，Vol.33Issue(8)：1793-1801,9.DOI:10.19595/j.cnki.1000-6753.tces.161716
峰值I2C控制Buck型LED驱动电源稳定性分析
Stability Analysis of Peak I2C Controlled LED Power Driver Based on Buck Converter
摘要
Abstract
Peak I2C control for lighting emitting diode (LED) driver to output constant current is investigated. In order to analyze the stability of peak I2C control, taking buck-based LED driver as an example, its control equation was established by Fourier series. The stable boundary equation was derived as well, which was simplified by the first-order Taylor series. With the increasing of the weight factor of output current in inner loop, the proportional term of compensator in outer loop increases, and the equivalent series resistance of LED varies. Their effects on the stability of LED driver were analyzed with the simplified boundary equation. It is found out that, when the equivalent series resistance of LED decreases, or the weight factor of output current and the proportional term of compensator increase, the stable region of the LED driver will be narrowed; slope compensation can extend the stable region by lessening the unstable phenomenon. Finally, the stability analysis is verified by computer simulation and hardware experiment.关键词
LED驱动电源/I2C控制/权重因子/稳定边界/斜坡补偿Key words
LED power driver/I2C control/weight factor/stable boundary/slope compensation分类
信息技术与安全科学引用本文复制引用
张凯暾,周国华,周述晗,吴佳慧,徐顺刚..峰值I2C控制Buck型LED驱动电源稳定性分析[J].电工技术学报,2018,33(8):1793-1801,9.基金项目
国家自然科学基金(61771405、61371033),全国优秀博士学位论文作者专项资金(201442),四川省学术和技术带头人培养资金和中央高校基本科研业务费专项资金(2682016CX035)资助项目. （61771405、61371033）
