A single-stage LED driver for street-lighting applications with interleaving PFC feature

Abstract

This paper proposes a single-stage light-emitting diode (LED) driver with interleaving power-factor-correction (PFC) feature for street-lighting applications. The presented circuit integrates an interleaved boost PFC converter with a half-bridge-type LLC resonant converter into a single-stage power converter. The presented AC-DC resonant converter uses interleaving methods to achieve input-current shaping, and possesses soft-switching functions on two active power switches to reduce their switching losses in order to increase the circuit efficiency. The proposed LED driver features low levels of input-current ripple, reduced switching losses, high power factor, low total harmonics distortion (THD) of input current, and a reduced components count. Finally, a prototype driver is successfully implemented and tested to provide a 144W-rated LED street-lighting module with a 110V utility-line input voltage. Experimental results demonstrate the feasibility of the proposed circuit.