Pulse Width Modulation current control for LED lighting horticulture systems

This paper presents a DC-DC LED driver for a 200 W luminaire dedicated to greenhouses lighting applications. Plants are more sensitive to particular radiations for their growth. Hence, we adopted only five LED types that favor photosynthesis process. In order to better control the luminous flux of plants, we used an inverted-Buck converter in each LED string type through four parallel devices of 50 W. A pulse width modulation (PWM) is carried out using the proportional-integral (PI) in order to control the LED's current. The present driver is designed and simulated using PSIM environment. Simulations results prove that the PWM current control guarantees an average current 280 mA with a low current ripple of the order of 10 mA maximizing efficiency energy.