This article presents a single-stage ac–dc light-emitting diode (LED) driver to achieve current regulation of red, green, and blue (RGB)-LED strings and ac–dc rectification with high power factor. The advantages of single-stage topology include single inductor, lower component counts, and smaller form factor. To adaptively and accurately regulate RGB-LED strings a switching capacitor control scheme is adopted with the properties of dynamic voltage difference detection and fast bus voltage hopping. The dynamic voltage difference detection precisely detects the voltage difference between the R- and GB-LED strings while the fast bus voltage hopping can immediately adjust the bus voltage level. The experimental results are shown to verify the theoretical analysis of the proposed LED driver, and the transient response time is less than 0.3 μs, which is at least three orders faster than the previous work. The peak efficiency of the proposed LED driver is up to 88.6%.

中文翻译：

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具有开关电容控制方案的单级低功耗 AC-DC RGB-LED 驱动器

本文介绍了一种单级交流-直流发光二极管 (LED) 驱动器，以实现红、绿、蓝 (RGB)-LED 灯串的电流调节和高功率因数的交流-直流整流。单级拓扑的优点包括单个电感器、更少的组件数量和更小的外形尺寸。为了自适应准确地调节RGB-LED灯串，采用具有动态电压差检测和快速总线电压跳跃特性的开关电容器控制方案。动态电压差检测精确检测R-和GB-LED串之间的电压差，而快速总线电压跳变可以立即调整总线电压电平。实验结果验证了所提出的 LED 驱动器的理论分析，瞬态响应时间小于 0.3 μs，这比之前的工作至少快了三个订单。建议的 LED 驱动器的峰值效率高达 88.6%。