An Efficient Reduced Power Processing Single-Phase LED Driver Using Unidirectional PFC Converter

Recent advancements in LED technology have led to the popularity of reduced-power processing schemes owing to their ability to improve conversion efficiency. When LEDs are connected to the ac grid, they satisfy essential requirements, such as power factor correction, resulting in reduced input-current harmonics and maintenance of ac grid power quality. To achieve a high-quality light output with no flickering, the LED load was supplied with a constant output current, resulting in the elimination of flickering. To address these requirements, a novel reduced-power LED driver was introduced in this study. It employs a switching mechanism to divide the input power into two parts, with one part directly transferred to the load, resulting in greater efficiency. A simple control method was used to eliminate flickering in the light output by reducing ripples present in the output current. Reducing ripples can decrease the capacitance requirements, enabling the substitution of electrolytic capacitors with film capacitors, thus increasing the lifespan of the LED driver. A prototype with a power rating of 30 W was developed, and its performance was evaluated. The findings showed that the input power factor was 0.99 and the lower harmonic distortion was minimal. In addition, the driver efficiency was 94.4% at full power. The converter underwent extensive testing with universal input voltages and power levels to guarantee a reliable dimming functionality.