Electrolytic capacitor-less AC-DC LED driver with constant output current and PFC

Recent developments in improving lighting efficiency and cost reduction of LED's have caused them to be a suitable alternative for the current lighting systems. In this paper a novel off-line structure is proposed to drive LED's. The proposed circuit has a high power factor and high efficiency and a long lifetime. To increase the life time of the converter, the proposed circuit doesn't use any electrolytic capacitors in the power stage. The proposed circuit consists of a transition mode (TM) Flyback converter in order to have power factor correction (PFC). A Buck converter is added to the third winding of the Flyback transformer in order to create two paths for the electrical power. DC power will get to the load through one stage converter (Flyback) and AC power will get to the load through two stage converter (Flyback+Buck). Therefore, the efficiency is improved in comparison with a regular two-stage circuit, as well as, having a low output current ripple. Principles of operation are presented as well as closed-loop simulation results for a 700mA / 20W prototype.

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

[2]  Chern-Lin Chen,et al.  Single-Stage Electrolytic-Capacitors-Free AC-to-DC LED Driving Circuit with High-Power-Factor , 2012, 2012 Asia-Pacific Power and Energy Engineering Conference.

[3]  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.

[4]  Alexandre Campos,et al.  Compact Emergency Lamp Using Power LEDs , 2012, IEEE Transactions on Industrial Electronics.

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

[6]  Chun-Taek Rim,et al.  Filter-free AC direct LED driver with unity power factor and low input current THD using binary segmented switched LED strings and linear current regulator , 2013, 2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC).

[7]  Javier Sebastian,et al.  Digital Implementation of the Feedforward Loop of the Asymmetrical Half-Bridge Converter for LED Lighting Applications , 2015, IEEE Journal of Emerging and Selected Topics in Power Electronics.

[8]  José Marcos Alonso Alvarez,et al.  Single-stage SEPIC-Buck converter for LED lighting with reduced storage capacitor , 2012, IECON.

[9]  Marco A. Dalla Costa,et al.  LED driver with bidirectional series converter for low frequency ripple cancelation , 2012, IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society.

[10]  Praveen K. Jain,et al.  A novel pulse current driving; High power factor LED driver without electrolytic capacitors , 2013, 2013 IEEE Energy Conversion Congress and Exposition.

[11]  Xinbo Ruan,et al.  A Method of Reducing the Peak-to-Average Ratio of LED Current for Electrolytic Capacitor-Less AC–DC Drivers , 2010, IEEE Transactions on Power Electronics.

[12]  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.

[13]  Xinbo Ruan,et al.  A Flicker-Free Electrolytic Capacitor-Less AC–DC LED Driver , 2011, IEEE Transactions on Power Electronics.

[14]  H. A. C. Braga,et al.  On the use of a low frequency boost rectifier as a high power factor LED driver , 2012, 2012 10th IEEE/IAS International Conference on Industry Applications.

[15]  J. Lam,et al.  A new high power factor, soft-switched LED driver without electrolytic capacitors , 2013, 2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC).

[16]  Wensong Yu,et al.  Bridgeless electrolytic capacitor-less valley-fill AC/DC converter for offline twin-bus light-emitting diode lighting application , 2013 .

[17]  N. Narendran,et al.  An Accelerated Test Method for Predicting the Useful Life of an LED Driver , 2011, IEEE Transactions on Power Electronics.

[18]  Rosario Casanueva,et al.  Feedforward compensation of resonant converters with heavy ripple in the DC bus for LED lamp driver applications , 2013, 2013 IEEE 14th Workshop on Control and Modeling for Power Electronics (COMPEL).

[19]  Wu Chen,et al.  A Novel Passive Offline LED Driver With Long Lifetime , 2010, IEEE Transactions on Power Electronics.

[20]  Tsorng-Juu Liang,et al.  A current ripple cancellation circuit for electrolytic capacitor-less AC-DC LED driver , 2013, 2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC).

[21]  S.Y.R. Hui,et al.  Comparative Study on the Structural Designs of LED Devices and Systems Based on the General Photo-Electro-Thermal Theory , 2010, IEEE Transactions on Power Electronics.

[22]  M. Arias,et al.  High-Efficiency Asymmetrical Half-Bridge Converter Without Electrolytic Capacitor for Low-Output-Voltage AC–DC LED Drivers , 2013, IEEE Transactions on Power Electronics.

[23]  M. Arias,et al.  Reduction of the output capacitor in Power Factor Correctors by distorting the line input current , 2010, 2010 Twenty-Fifth Annual IEEE Applied Power Electronics Conference and Exposition (APEC).

[24]  Wu Chen,et al.  Elimination of an Electrolytic Capacitor in AC/DC Light-Emitting Diode (LED) Driver With High Input Power Factor and Constant Output Current , 2012, IEEE Transactions on Power Electronics.

[25]  M. Pashley,et al.  Red, green, and blue LEDs for white light illumination , 2002 .

[26]  R. Stevenson.  LEDs for less , 2012, IEEE Spectrum.