Abstract
This paper presents and implements a single-stage high-power-factor light-emitting diode (LED) driver with coupled inductors, suitable for streetlight applications. The presented LED driver integrates an interleaved buck-boost power factor correction (PFC) converter with coupled inductors and a half-bridge-type series-resonant converter cascaded with a full-bridge rectifier into a single-stage power conversion circuit. Coupled inductors inside the interleaved buck-boost PFC converter sub-circuit are designed to operate in discontinuous conduction mode (DCM) for achieving input-current shaping, and the half-bridge-type series resonant converter cascaded with a full-bridge rectifier is designed for obtaining zero-voltage switching (ZVS) on two power switches to reduce their switching losses. Analysis of operational modes and design equations for the presented LED driver are described and included. In addition, the presented driver features a high power factor, low total harmonic distortion (THD) of input current, and soft switching. Finally, a prototype driver is developed and implemented to supply a 165-W-rated LED streetlight module with utility-line input voltages ranging from 210 to 230 V. Experimental results demonstrate that high power factor (>0.99), low utility-line current THD ( 90%) are obtained in the presented single-stage driver for LED streetlight applications.
Highlights
Instead of incandescent bulbs with poor lighting efficiency, light-emitting diode (LED) light sources offer high luminous efficacy, long lamp-life, and are mercury-free alternatives for indoor and outdoor lighting applications [1,2,3]
LEDs has been widely utilized in our daily lives such as streetlights, flashlights, backlight sources, displays, decorative lighting, automotive lighting, and so on [4,5,6,7,8,9,10,11,12,13,14,15,16]
Because the DC bus voltage is reduced, the presented LED driver is suitable for the applications with high utility-line voltage
Summary
Instead of incandescent bulbs with poor lighting efficiency, light-emitting diode (LED) light sources offer high luminous efficacy, long lamp-life, and are mercury-free alternatives for indoor and outdoor lighting applications [1,2,3]. Traditional lighting sources for streetlight applications have been high-pressure mercury lamps because of their low-cost. LEDs have begun to replace the conventional high-pressure mercury streetlight. LED driver supplying a rated lamp power of greater than 70 W for streetlight applications, shown. In with coupled inductors and high power factor for streetlight applications. Descriptions and analysis with coupled inductors and high power factor for streetlight applications. LEDLED driver, and of modes, and anddesign designequations equationsofof key components in the presented driver, experimental results obtained from a prototype circuit are are demonstrated.
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