A Cost-Efficient LED Driver with Low-Flicker

Chih-Lung Yang ； Y.T. Yau

《Journal of Innovative Technology》 4卷2期 (2022/09) Pp. 21-27

https://doi.org/10.29424/JIT.202209_4(2).0003

摘要

The market for LED lighting has been growing steadily due to its high efficiency and long life. However, there are still several technical challenges to overcome, especially with grid-powered LED drivers. The line-frequency flicker has become a health issue. Although line-frequency flicker is usually invisible, it can be picked up by the retina, causing visual fatigue. Therefore, LED drivers need to produce constant power to avoid flicker. In this paper, a hybrid driver circuit with an isolated PFC flyback and a linear constant current LED driver is proposed with the novel dynamic control method. The new approach enables the linear constant-current LED driver to operate with high efficiency. Since the linear constant-current LED driver has no concern about high-frequency, high-voltage, and high-current switching. It minimizes EMI risk and reduces the system complex and cost. Finally, a low flicker 25W LED driver with DALI 2.0 interface is completed.

關鍵字

LED ； flicker ； lighting

參考文獻

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