Single-Phase LED Driver With Reduced Power Processing and Power Decoupling

Reduced power processing is a new trend to improve the conversion efficiency of light-emitting diode (LED) driver systems. Based on the concept, a new LED driver architecture is proposed in this article, which requires fewer power semiconductors compared with prior works, leading to the potential of lower cost and higher efficiency. A new ac/dc LED driver topology is derived accordingly based on the architecture to achieve the constant output current and unity power factor with significant energy storage reduction of the 100-/120-Hz energy buffer. Through a split and shared inductor, the required magnetic energy storage in the derived topology is the same as the conventional single-stage power factor correction converter, indicating high power density. Experimental evaluation verifies the performance in terms of improved power quality and conversion efficiency.