Design of Dimmable Light Emitting Diode Driver for Low Power Applications

Ramanjaneya reddy U, Kalyan Kumar Koppolu

Abstract


High-brightness light emitting diodes (HB-LED) are used in various applications in preference to conventional light bulbs due to
following merits: eco-friendly nature, high luminous efficacy, prolonged life, compactness and low heat dissipation. This work
presents the boost converter fed dimmable light emitting diode where illumination control is required. The proposed work uses
pulse width modulated (PWM) controlled switch in series with LED load to control the illumination level by adjusting the pulse
width. The closed loop control is designed in Matlab/Simulink to regulate the load voltage. This paper first illustrates in detail
the basic operation of the converter and dimming control and then provides the simulation results with different illumination
levels to demonstrate the effectiveness of converter and controller.


Keywords


Light emitting diode, Pulse width modulation, boost converter, closed loop control, illumination

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