A single-stage LED driver for street-lighting applications with high PF

This paper proposes a novel single-stage, high-power-factor LED driver for street-lighting applications. The presented LED driver integrates a dual boost power-factor-correction (PFC) AC-DC converter with a half-bridge-type LLC DC-DC resonant converter into a single-stage conversion circuit topology. Tw o inductors inside the dual boost converter sub-circuit are designed to be operated in discontinuous-conduction mode (DCM) for achieving input current shaping. The proposed AC-DC resonant driver lowers the switching losses of two power switches and two output rectifier diodes in order to increase the circuit efficiency. The proposed driver features cost-effectiveness, high power factor and low levels of input current harmonics. Finally, a prototype driver for powering a 144W-rated LED lamp with a 110V utility-line input voltage is developed and tested, and satisfying experimental results verify the feasibility of the proposed LED circuit.