A Novel Single-Stage High-Power-Factor AC-DC LED Power Supply for Streetlight Applications

摘要

This paper presents a novel single-stage AC-DC LED power supply with high power-factor correction (PFC) for streetlight applications. The proposed LED power supply integrates a totem-pole bridgeless boost converter with PFC and a half-bridge series-resonant converter cascaded with a bridge rectifier into a single-stage AC-DC power-conversion circuit. Additionally, input-current shaping of the utility-line and zero-voltage switching (ZVS) on power switches are achieved in the presented LED power supply. Furthermore, a prototype AC-DC power supply with a 165W (235V/700mA) rated power is developed and implemented to provide an LED streetlight module with an input utility-line voltage of 110V. High power factor, low utility-line current total-harmonic-distortion (THD), soft-switching of power switches, and high efficiency are obtained in the presented single-stage AC-DC LED power supply for streetlight applications.