A novel single-stage high-power-factor LED driver for street-lighting applications

This paper proposes a novel single-stage LED driver for street-lighting applications with high levels of power factor. The presented driver integrates a modified bridgeless power-factor-correction (PFC) AC-DC converter with a half-bridge-type LLC DC-DC resonant converter into a single-stage conversion circuit topology. The proposed AC-DC resonant driver provides input current shaping, and its offers attributes of lowered switching losses to the soft-switching functions obtained on two power switches and two output rectifier diodes. The proposed driver features cost-effectiveness, high circuit efficiency, high power factor, low input current ripples and a reduced components count. A prototype driver is developed to supply a 144W LED street-lighting module with a 110V utility-line input voltage. Experimental results demonstrate the functionalities of the proposed circuit.