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该论文提出了一种用于多串LED驱动器的软自换向方法，通过最小化控制电路实现高效率和高功率因数。该方法解决了传统多串LED驱动器中因高电压余量导致的效率下降问题，并降低了总谐波失真。
Light-emitting diodes (LEDs) are widely used in general lightings due to their several advantages including high efficiency, high reliability, long life, and environmental friendliness. Recently, various converter-free methods for non-isolated LED drivers with multiple LED strings connected in series have been introduced, enabling both a higher efficiency and power factor (PF) as well as lower total harmonic distortion (THD) [1-3]. In multiple-string LED drivers, the efficiency and PF are enhanced as the number of LED strings increases because of a low overhead voltage. However, as the operational voltage range decreases, it is difficult to find a proper commutation time using input voltage sensing approaches due to input voltage noise and LED voltage variation [4]. Other concerns are EMI and EMC noise caused by high di/dt and dv/dt in hard commutations. When the LED current is high, negative effects of hard commutation
Junsik Kim, Jiyong Lee, Shihong Park
Dankook University, Yongin, Korea