Method to design alternating current light-emitting diodes luminous flux

Abstract

Fluctuation of current through alternating current operated light-emitting diodes (AC LEDs) make luminous flux simply equivalent to the product of power consumption and luminous efficiency unreasonable, unlike constant current scenario. Based on application model and average luminous efficiency introduced by this paper, relationship between AC LEDs luminous flux and its application circuit parameters, including balance resistor, threshold voltage and equivalent resistor of LED etc. was presented. Then method to design AC LEDs through single LED photoelectric characters to meet luminous flux requirement was given.

Understanding multi-domain compact modeling of light-emitting diodes

“…The solid lines in Figure 3, represent normal operating parameters; the dotted lines are extrapolated ones. Further luminous flux ϕ v of an LED is proportional to its forward current, hence increased current levels will create unacceptable changes in photometric characteristics (Dulout et al, 2016;Gao et al, 2015;Grodzki, 2013;Keppens et al, 2009;Li et al, 2015;Moolman et al, 2009;Yuzhen et al, 2016). If the resulting forward current exceeds safe operating limits recommended by the manufacturer, the life and long-term performance of the LED will be affected.…”