A Novel AC-DC LED Integrated Streetlight Driver with Power-Factor-Correction and Soft-Switching Functions

This paper proposes a novel AC-DC light-emitting-diode (LED) integrated streetlight driver, which merges an interleaved buck converter with coupled inductors and a half-bridge series resonant converter with a full-bridge rectifier into a single-stage power conversion topology, featuring with power-factor-correction (PFC) and soft-switching. By designing the coupled inductors in the interleaved buck converting sub-circuit at discontinuous-conduction mode, the function of PFC is accomplished. In addition, the resonant tank in the half-bridge series resonant converting sub-circuit is designed to resemble an inductive load, so that the power switches have the function of zero-voltage switching (ZVS), reducing the switching loss and improving the overall efficiency of the proposed circuit.A 165W-rated (235V/0.7A) LED streetlight prototype driver with an input utility-line voltage of 110 V has been developed and tested. According to the measured results, a power factor greater than 0.98, an input current total harmonic distortion factor less than 3%, and an efficiency greater than 89% are obtained in the AC-DC LED integrated streetlight driver. Therefore, satisfying outcomes from experimental results demonstrate the functionality of the proposed LED streetlight driver.