A Comparative Analysis of Flicker Index and Modulation Depth on Few Existing Dimmable LED Drivers

摘要

This paper presents a computed comparative analysis of the standard metrics of Flicker Index and Modulation Depth defined in IEEE Std. 1789-2015, which are used to quantify the variation of light intensity, between few existing dimmable LED driver's LED current output. The standard metrics are the indices of flicker which is associated with LED dimming functionality and basically depends on the LED driver topology. The IEEE Std. 1789-2015 recommends the standard metrics to be kept low to avoid health hazards associated with flicker thereby contributing to the faster adoption of LED technology in the market. Three existing LED driver topologies with dimming capability are investigated in this paper and from their corresponding LED current outputs the standard metrics are evaluated and compared for different dimming ratios.