采用自适应断时控制的滞后电流控制方法设计LED恒流驱动器

Honghui Deng, Liuwei Shan, Yongsheng Yin, Guangfa Si, Yuqing Sun
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引用次数: 5

摘要

本文提出了一种新的自适应开关时间(AOT)技术,该技术适用于采用磁滞电流控制方法的交直流恒流LED驱动器的电路设计。针对典型低侧电流感测拓扑中由于采用恒定断时(COT)技术导致峰值电流与平均电流不一致的问题,提出了一种基于峰值电流环与误差样本反馈环相结合的新型断时控制方法。输出电流大小由感测电阻控制。仿真结果表明,平均电流误差不大于1.1%。在20V ~ 100V输出电压范围内,平均电流变化小于1.5%,具有良好的负载调节特性。该设计采用台积电0.25μm 40V BCD工艺实现。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Design of a LED constant-current driver using a novel hysteresis-current control method with adaptive off-time control
A novel adaptive off-time (AOT) technique, which is applicable to the circuit design of an AC-DC constant-current LED driver using hysteresis-current control method, is proposed in this paper. The AOT is achieved by a novel off-time control method, which is based on the combination of peak-current-loop and error sample feedback-loop, to solve the problem that peak current is not consistent with average current due to the constant off-time (COT) technique in the typical low side current sense topology. Output current magnitude is controlled by sense resistor. The simulation result shows that the average current error is no more than 1.1%. The average current achieves less than 1.5% variation in the output voltage range from 20V to 100V, which means good load regulation characteristic can be achieved. The design was implemented with TSMC' 0.25μm 40V BCD process.
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