A single stage SEPIC PFC converter for LED street lighting applications

Light Emitting Diodes (LEDs) with their current performances have been proved to be the most suitable solution for street lighting applications. Nowadays, a topic of interest in this context is the design for electronic driver in order to take the advantage of LEDs performances. However, requirements such as high power factor, long life time, accurate current control and high efficiency pose challenges to the design of LED driver circuits. Single-stage power factor correction (PFC) topologies are preferred here for their advantages of lower cost and near unity power factor, while adding a separated PFC stage will surely increase the cost. This paper presents a high efficiency single-stage LED lamp driver for street lighting applications based on SEPIC PFC converter topology operating in continuous conduction mode (CCM). This converter has achieved high efficiency and high power factor all over the operating range with low total harmonic distortion (THD). Simulation results are provided to demonstrate the effectiveness of the proposed driver. Then, a laboratory prototype is built to verify the feasibility of the proposed LED lamp driver.