A novel single-stage LED driver for street lighting

A novel single-stage LED driver for street lighting is proposed. The system consists of a constant current circuit and a constant voltage circuit, and the constant voltage circuit is obtained by integrating a Buck-Boost circuit and a Flyback circuit. Because the components of the system are reduced by integrating, the cost decreases, and the reliability and efficiency of the system are improved, and the peak current control mode is adopted in the constant current circuit which is a Boost circuit and works in PWM mode. Since the Boost topology is seleeted, the LED rings can be reduced which increases the efficiency of the system. The theoretical analysis and design procedures of the proposed lighting system are proposed and discussed in detail here. Simulation and experimental studies with 100W prototype are done to prove the analysis. In the experiment, the power factor of the system is as high as 0.99, and the efficiency is higher than 80% in full load.