Single-Stage AC/DC Single-Inductor Multiple-Output LED Drivers

Various ac/dc LED driver topologies have been proposed to meet the challenges of achieving a compact, efficient, low-cost, and robust multistring LED lighting system. These LED drivers typically employ a two-stage topology to realize the functions of ac/dc rectification and independent current control of each LED string. The choice of having two stage conversions involves additional hardware components and a more complicated controller design process. Such two-stage topologies suffer from a higher system cost, increased power loss, and large form factor. In this paper, a single-stage ac/dc single-inductor multiple-output LED driver is proposed. It uses only one single inductor and N + 1 active power switches (N being the number of LED strings) with reduced component count and smaller form factor. The proposed driver can achieve both functions of ac/dc rectification with a high power factor and precise independent current control of each individual LED string simultaneously. A prototype of an ac/dc single-inductor triple-output LED driver is constructed for verification. Experimental results corroborate that precise and independent current regulation of each individual LED string is achievable with the proposed driver. A power factor of above 0.99 and a peak efficiency of 89% at 30-W rated output power are attainable.

[1]  Albert T. L. Lee,et al.  Scalability of Quasi-Hysteretic FSM-Based Digitally Controlled Single-Inductor Dual-String Buck LED Driver to Multiple Strings , 2014, IEEE Transactions on Power Electronics.

[2]  J.Y. Tsao,et al.  Solid-state lighting: lamps, chips and materials for tomorrow , 2005, (CLEO). Conference on Lasers and Electro-Optics, 2005..

[3]  Hyun-Chang Kim,et al.  An AC-powered, flicker-free, multi-channel LED driver with current-balancing SIMO buck topology for large area lighting applications , 2014, 2014 IEEE Applied Power Electronics Conference and Exposition - APEC 2014.

[4]  Javier Sebastian,et al.  High-Efficiency LED Driver Without Electrolytic Capacitor for Street Lighting , 2013 .

[5]  K. Hwu,et al.  Applying One-Comparator Counter-Based Sampling to Current Sharing Control of Multichannel LED Strings , 2011, IEEE Transactions on Industry Applications.

[6]  Jianfeng Wang,et al.  A Capacitor-Isolated LED Driver With Inherent Current Balance Capability , 2012, IEEE Transactions on Industrial Electronics.

[7]  Chien-Ming Wang,et al.  A Balancing Strategy and Implementation of Current Equalizer for High Power LED Backlighting , 2007, 2007 7th International Conference on Power Electronics and Drive Systems.

[8]  Simon S. Ang,et al.  A RGB-driver for LED display panels , 2010, 2010 Twenty-Fifth Annual IEEE Applied Power Electronics Conference and Exposition (APEC).

[9]  Chi-Ying Tsui,et al.  A 1.8 V single-inductor dual-output switching converter for power reduction techniques , 2001, 2001 Symposium on VLSI Circuits. Digest of Technical Papers (IEEE Cat. No.01CH37185).

[10]  M. Craford.  LEDs challenge the incandescents , 1992, IEEE Circuits and Devices Magazine.

[11]  Xiaohui Qu,et al.  Color Control System for RGB LED Light Sources Using Junction Temperature Measurement , 2007, IECON 2007 - 33rd Annual Conference of the IEEE Industrial Electronics Society.

[12]  Siew-Chong Tan,et al.  Reset-sensing quasi-V2 single-inductor multiple-output buck converter with reduced cross-regulation , 2015, 2015 IEEE Applied Power Electronics Conference and Exposition (APEC).

[13]  Siew-Chong Tan,et al.  Precise Dimming and Color Control of LED Systems Based on Color Mixing , 2016, IEEE Transactions on Power Electronics.

[14]  Yu-Kang Lo,et al.  Design and Implementation of RGB LED Drivers for LCD Backlight Modules , 2009, IEEE Transactions on Industrial Electronics.

[15]  Chern-Lin Chen,et al.  A Novel Single-Stage High-Power-Factor AC-to-DC LED Driving Circuit With Leakage Inductance Energy Recycling , 2012, IEEE Transactions on Industrial Electronics.

[16]  Chi K. Tse,et al.  A Survey, Classification, and Critical Review of Light-Emitting Diode Drivers , 2016, IEEE Transactions on Power Electronics.

[17]  Adrian Ioinovici,et al.  A single switch boost-flyback DC-DC converter integrated with switched-capacitor cell , 2011, 8th International Conference on Power Electronics - ECCE Asia.

[18]  E. L. Corominas,et al.  A Study on LED Retrofit Solutions for Low-Voltage Halogen Cycle Lamps , 2012 .

[19]  K. I. Hwu,et al.  A Simple Current-Balancing Converter for LED Lighting , 2009, 2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition.

[20]  Jih-Sheng Lai,et al.  A Novel Valley-Fill SEPIC-Derived Power Supply Without Electrolytic Capacitor for LED Lighting Application , 2012, IEEE Transactions on Power Electronics.

[21]  R. Zane,et al.  LED Driver Circuit with Series-Input-Connected Converter Cells Operating in Continuous Conduction Mode , 2010, IEEE Transactions on Power Electronics.

[22]  Robert W. Erickson,et al.  Fundamentals of Power Electronics , 2001 .

[23]  Fred C. Lee,et al.  Multi-channel constant current (MC3) LLC resonant LED driver , 2011, 2011 IEEE Energy Conversion Congress and Exposition.

[24]  Xinbo Ruan,et al.  Means of Eliminating Electrolytic Capacitor in AC/DC Power Supplies for LED Lightings , 2009, IEEE Transactions on Power Electronics.

[25]  Yi Zhang,et al.  A SIMO Parallel-String Driver IC for Dimmable LED Backlighting With Local Bus Voltage Optimization and Single Time-Shared Regulation Loop , 2012, IEEE Transactions on Power Electronics.

[26]  T.-F. Wu,et al.  LED back-light driving system for LCD panels , 2006, Twenty-First Annual IEEE Applied Power Electronics Conference and Exposition, 2006. APEC '06..

[27]  Sinan Li,et al.  Self-Configurable Current-Mirror Circuit With Short-Circuit and Open-Circuit Fault Tolerance for Balancing Parallel Light-Emitting Diode (LED) String Currents , 2014, IEEE Transactions on Power Electronics.

[28]  Huang-Jen Chiu,et al.  A High-Efficiency Dimmable LED Driver for Low-Power Lighting Applications , 2010, IEEE Transactions on Industrial Electronics.

[29]  M.M. Jovanovic,et al.  LED Driver With Self-Adaptive Drive Voltage , 2008, IEEE Transactions on Power Electronics.

[30]  Wu Chen,et al.  A Dimmable Light-Emitting Diode (LED) Driver With Mag-Amp Postregulators for Multistring Applications , 2011, IEEE Transactions on Power Electronics.

[31]  Tsai-Fu Wu,et al.  Multistring LED Backlight Driving System for LCD Panels With Color Sequential Display and Area Control , 2008, IEEE Transactions on Industrial Electronics.

[32]  Chi-Ying Tsui,et al.  Single-inductor multiple-output switching converters with bipolar outputs , 2001, ISCAS 2001. The 2001 IEEE International Symposium on Circuits and Systems (Cat. No.01CH37196).

[33]  Henry Shu-Hung Chung,et al.  Use of Daisy-Chained Transformers for Current-Balancing Multiple LED Strings , 2014, IEEE Transactions on Power Electronics.