Study and Implementation of LEDs Drivers with Dimming Capability

Abstract

Nowadays, LED lights take an important place in our daily lives and they have known a great growth in indoor as well as in outdoor lighting applications. LED (Light Emitting Diode) light sources including their own drivers have excluded many systems fitted with both inefficient light sources. In this paper we present, a LED driver handling a DC input power supply and piloting a series of powered LEDs Some topologies of LED driver supplying a constant voltage or a constant current toward a LED load and their operations are detailed and presented. In this regard, two types of DC-DC converter in occurrence buck and boost converter are analyzed, designed, and simulated. Furthermore, a design of laboratory prototype of constant-current LED drivers based on DC-DC buck converter totally dimed is achieved, and tested. Calculated and experimental results are in good correspondence with very small deviation of LED current in both cases for different levels of dimming.