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提出一种同步浮动电流镜技术，用于多串线性LED驱动器，解决传统顺序开关导致各串LED导通占空比差异大（如80%、60%、40%、20%）从而利用率低的问题。通过同步控制实现各LED串更均衡的导通时间，最大化LED利用率。
High-voltage linear drivers for multiple-string LEDs have been widely used in general lighting due to their low cost, simplicity, low electromagnetic interference (EMI), and high reliability. However, in conventional multiple-string LED drivers, the LED strings are turned on and off sequentially depending on the magnitude of input voltage (VIN) in order to achieve high power factor (PF) and low total harmonic distortion (THD) [1-3]. The turn-on duty cycles of each string in a fourstring LED driver are roughly 80, 60, 40 and 20% respectively, given that VLEDs are identical. Due to its low duty cycle operation, the total brightness is reduced and the brightness of each LED string becomes uneven. This problem becomes more noticeable in long bar-type or surface-type lamps when a triac dimmer is applied. This low utilization of LEDs is a major drawback of multi-string LED drivers. One approach to increase turn-on duty cycle uses diodes and capacitors
Junsik Kim, Shihong Park
Dankook University, Yongin, Korea