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Energies 2015, 8(3), 2125-2144; doi:10.3390/en8032125

Design of an LLC Resonant Converter for Driving Multiple LED Lights Using Current Balancing of Capacitor and Transformer

1
LG Innotek Co., Ltd., 26, Hanamsandan 5beon-ro, Gwangsan-gu, Gwangju 506-731, Korea
2
Department of Electrical Engineering, Chonnam National University, Gwangju 500-757, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Chris Bingham
Received: 3 November 2014 / Accepted: 12 March 2015 / Published: 18 March 2015

Abstract

In this study, to achieve the constant current drive and brightness control without a separate pulse width modulation (PWM) converter, a single converter is designed and verified by experiment under the condition of a multiple LED light load with different output voltage (Vf) characteristics. In the case of the input of 140 Watt class level, the proposed converter can drive two voltage type 95 Vdc (300 mA) light emitting diode (LED) lights loads and 120 Vdc (300 mA) LED lights loads simultaneously. In addition, to improve commercial compatibility, the proposed converter is operated in a wide range of the input voltage 90~264 Vac; also, the Power Factor Correction (PFC) circuit with the input power factor of more than 0.9 is added. In order to maximize the power conversion efficiency, a LLC resonant converter is applied to the PFC block with the output voltage of 380 Vdc and to a DC-DC conversion block. Finally, reliability of the proposed converter is verified through total harmonic distortion (THD) and electromagnetic interference (EMI) tests. View Full-Text
Keywords: multiple LED lights; LLC resonant converter; current balancing; efficiency; power factor; total harmonic distortion (THD); electromagnetic interference (EMI) test; life time multiple LED lights; LLC resonant converter; current balancing; efficiency; power factor; total harmonic distortion (THD); electromagnetic interference (EMI) test; life time
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Han, J.-H.; Lim, Y.-C. Design of an LLC Resonant Converter for Driving Multiple LED Lights Using Current Balancing of Capacitor and Transformer. Energies 2015, 8, 2125-2144.

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