Design and realization of LED Driver for solar street lighting applications

The use of white LEDs in photovoltaic standalone lighting systems requires knowledge of electrical, optical and thermal characteristics. These parameters allow us to improve and develop this type of system. Luminous intensity and life time of LEDs components are functions of the current intensity. To have stable LEDs characteristics various configurations are proposed for the Driver circuit (Direct Current “DC” mode, Pulse Width Modulation “PWM” mode). Various selection criteria are discussed such as: the simplicity of the circuit, the cost of manufacturing, energy consumption and losses (thermal and electrical) generated by this specific LED's Driver. This study allowed us to implement a command control (DC Driver) to solar LEDs lamp based on white diodes of phosphorus GaN semiconductors. This system is applied to street lighting by means of photovoltaic standalone system. The aim of this work is to obtain a stable LEDs control command by using a minimum of electric power for operation with long service life and stable illumination.