Primary Side Constant Power Control Scheme for LED Drivers Compatible with TRIAC Dimmers

This paper proposes a primary side constant power control scheme for TRIAC dimmer compatible LED drivers. The LED driver is a Flyback converter operated in boundary conduction mode (BCM) to minimize the switching loss. With the proposed control scheme, the input power of the Flyback converter can be controlled by the TRIAC dimming angle, which is not affected by AC input voltage variations. Since the output voltage is almost constant for LED loads, the output current can be changed by controlling the input power with a given conversion efficiency. The isolated feedback circuit is eliminated with the proposed primary side control scheme, which dramatically simplifies the whole circuit. In addition, the input current automatically follows the input voltage due to the BCM operation, and the resistive input characteristic can be achieved which is attractive for TRIAC dimming applications. Experimental results from a 15W prototype verify the theoretical analysis.

[1]  Fei Yu,et al.  Modeling and Control Method for High-power Electromagnetic Transmitter Power Supplies , 2013 .

[2]  Hulong Zeng,et al.  A Primary-Side Control Scheme for High-Power-Factor LED Driver With TRIAC Dimming Capability , 2012, IEEE Transactions on Power Electronics.

[3]  Zhaoming Qian,et al.  A primary side controlled WLED driver compatible with Triac dimmer , 2011, 2011 Twenty-Sixth Annual IEEE Applied Power Electronics Conference and Exposition (APEC).

[4]  Dan Chen,et al.  An adaptive high-precision overpower protection scheme for primary-side controlled flyback converters , 2011, 2011 Twenty-Sixth Annual IEEE Applied Power Electronics Conference and Exposition (APEC).

[5]  Xiaohui Qu,et al.  Resonance-Assisted Buck Converter for Offline Driving of Power LED Replacement Lamps , 2011, IEEE Transactions on Power Electronics.

[6]  Tzuen-Lih Chern,et al.  High power factor Flyback converter for LED driver with Boundary Conduction Mode control , 2010, 2010 5th IEEE Conference on Industrial Electronics and Applications.

[7]  Zhaoming Qian,et al.  A Precise Passive Current Balancing Method for Multioutput LED Drivers , 2011, IEEE Transactions on Power Electronics.

[8]  Hyunchul Eom,et al.  Design optimization of TRIAC-dimmable AC-DC converter in LED lighting , 2012, 2012 Twenty-Seventh Annual IEEE Applied Power Electronics Conference and Exposition (APEC).

[9]  Andre Tjokrorahardjo,et al.  Simple triac dimmable Compact Fluorescent Lamp ballast and Light Emitting Diode driver , 2010, 2010 Twenty-Fifth Annual IEEE Applied Power Electronics Conference and Exposition (APEC).

[10]  Xiaogao Xie,et al.  A Novel Output Current Estimation and Regulation Circuit for Primary Side Controlled High Power Factor Single-Stage Flyback LED Driver , 2012, IEEE Transactions on Power Electronics.

[11]  Dan Chen,et al.  An Adaptive High-Precision Overpower Protection Scheme for Primary-Side Controlled Flyback Converters , 2011, IEEE Transactions on Power Electronics.

[12]  N. Narendran,et al.  Life of LED-based white light sources , 2005, Journal of Display Technology.

[13]  Regan Zane,et al.  A 0.9 PF LED driver with small LED current ripple based on series-input digitally-controlled converter modules , 2010, 2010 Twenty-Fifth Annual IEEE Applied Power Electronics Conference and Exposition (APEC).

[14]  B. Lehman,et al.  Issues, Models and Solutions for Triac Modulated Phase Dimming of LED Lamps , 2007, 2007 IEEE Power Electronics Specialists Conference.

[15]  M. Rico-Secades,et al.  A Universal-Input Single-Stage High-Power-Factor Power Supply for HB-LEDs Based on Integrated Buck-Flyback Converter , 2009, 2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition.

[16]  Zhu Feng,et al.  Primary side control circuit of a flyback converter for HBLED , 2010, The 2nd International Symposium on Power Electronics for Distributed Generation Systems.

[17]  Javier Sebasti.  A Very Simple Control Strategy for Power Factor Correctors Driving High-Brightness LEDs , 2009 .

[18]  José Marcos Alonso Alvarez,et al.  A Universal-Input Single-Stag2e High-Power-Factor Power Supply for HB-LEDs Based on Integrated Buck–Flyback Converter , 2011, IEEE Transactions on Industrial Electronics.

[19]  Henry Shu-hung Chung,et al.  A driving technology for retrofit LED lamp for fluorescent lighting fixtures with electronic ballasts , 2010, 2010 IEEE Energy Conversion Congress and Exposition.

[20]  José Marcos Alonso Alvarez,et al.  Analysis and Design of the Integrated Double Buck–Boost Converter as a High-Power-Factor Driver for Power-LED Lamps , 2012, IEEE Transactions on Industrial Electronics.

[21]  H. M. Pang,et al.  A stability issue with current mode control flyback converter driving LEDs , 2009, 2009 IEEE 6th International Power Electronics and Motion Control Conference.