A single‐stage LED streetlight driver with PFC and digital PWM dimming capability

Abstract

SUMMARYThis paper proposes a single-stage light-emitting diode (LED) driver that offers power-factor correction and digital pulse-width modulation (PWM) dimming capability for streetlight applications. The presented LED streetlight driver integrates an alternating current-direct current (AC-DC) converter with coupled inductors and a half-bridge-type LLC DC-DC resonant converter into a single-stage circuit topology. The sub-circuit of the AC-DC converter with coupled inductors is designed to be operated in discontinuous-conduction mode for achieving input-current shaping. Zero-voltage switching of two active power switches and zerocurrent switching of two output-rectifier diodes in the presented LED driver decrease the switching losses; thus, the circuit efficiency is increased. A prototype driver for powering a 144-W-rated LED streetlight module with input utility-line voltages ranging from 100 to 120 V is implemented and tested. The proposed streetlight driver features cost-effectiveness, high circuit efficiency, high power factor, low levels of inputcurrent harmonics, and a digital PWM dimming capability ranging from 20% to 100% output rated LED power, which is fulfilled by a micro-controller. Satisfying experimental results, including dimming tests, verify the feasibility of the proposed LED streetlight driver.

A three‐leg resonant converter for two output LED lighting application with independent control

“…With the recent developments in lighting industry, light emitting diodes (LEDs) have become more popular and more accessible to general public over conventional sources. [9][10][11][12][13][14] And also, DC operated driver circuits have been proposed for LED applications to enhance dc power distribution in lighting industry. [1][2][3] At present, LEDs have entered in almost all lighting applications like signal lighting, street lighting, indoor lighting, transportation, liquid crystal display (LCD) backlighting, architectural lighting, and parking lighting.…”

“…7,8 As LEDs are operated from dc sources, good number of ac-dc LED driver topologies have been proposed to meet the essential objectives like power factor correction (PFC) and elimination of electrolytic capacitor to improve reliability and dimming features. [9][10][11][12][13][14] And also, DC operated driver circuits have been proposed for LED applications to enhance dc power distribution in lighting industry. [15][16][17][18][19][20][21][22] LED lighting applications need efficient light output, independent current regulation, and illumination control to reduce energy expenses.…”

A Single-Stage LED Streetlight Driver with Soft-Switching and Interleaved PFC Features

“…However, the circuit is not efficient, and requires more power switches and components in a conventional two-stage streetlight driver. The literature presents some single-stage streetlight drivers that integrate an AC-DC converter with a DC-DC converter [16][17][18][19][20]. Figure 1 shows an existing single-stage LED streetlight driver, which combines an interleaved boost converter with a half-bridge-type LLC resonant converter into a converter with a half-bridge-type LLC resonant converter into a single-stage power converter for supplying the LED street-lighting module at a utility-line voltage of 110V [16].…”

A buck‐boost integrated high gain non‐isolated half‐bridge series resonant converter for solar PV/battery fed multiple load LED lighting applications

“…Several other LED driver configurations have adopted half‐bridge resonant converter due to its simple structure, easy implementation, small output filter size, and high efficiency due to zero voltage switching (ZVS), etc. Further, these half‐bridge resonant converters are integrated with other converters and called as a single‐stage AC‐DC LED drivers that achieve multitask with reduced component count and improved efficiency.…”