Means of Eliminating Electrolytic Capacitor in AC/DC Power Supplies for LED Lightings

This paper proposes two methods of reducing the storage capacitance in the ac/dc power supplies for light emitting diode (LED) lighting. In doing so, film capacitors can be adopted instead of electrolytic capacitors to achieve a long power suppliespsila lifetime. The voltage ripple of the storage capacitor is intentionally increased to reduce the storage capacitance. The method of determining the storage capacitance for ensuring that the boost power factor correction converter operates normally in the whole input voltage range is also discussed. For the purpose of further reducing the storage capacitance, a method of injecting the third harmonic current into the input current flow is proposed. While ensuring that the input power factor is always higher than 0.9 to comply with regulation standards such as ENERGY STAR, the storage capacitance can be reduced to 65.6% of that with an input power factor of 1. A 60-W experimental prototype is built to verify the proposed methods.

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

[2]  Keyue Smedley,et al.  A topology survey of single-stage power factor corrector with a boost type input-current-shaper , 2001 .

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

[4]  Michael A. E. Andersen,et al.  Two-stage power factor corrected power supplies: the low component-stress approach , 2002, APEC. Seventeenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.02CH37335).

[5]  Paul S. Martin,et al.  Illumination with solid state lighting technology , 2002 .

[6]  Tamotsu Ninomiya,et al.  A unified design of single-stage and two-stage PFC converter , 2003, IEEE 34th Annual Conference on Power Electronics Specialist, 2003. PESC '03..

[7]  Oscar Garcia,et al.  Single phase power factor correction: a survey , 2003 .

[8]  T. Ninomiya,et al.  Study of alternative regimes to analyze two-stage PFC converter , 2004, Nineteenth Annual IEEE Applied Power Electronics Conference and Exposition, 2004. APEC '04..

[9]  M.M. Hernando,et al.  Power factor correction with a partial power processing converter , 2005, Twentieth Annual IEEE Applied Power Electronics Conference and Exposition, 2005. APEC 2005..

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

[11]  Heinz van der Broeck,et al.  Power driver topologies and control schemes for LEDs , 2007, APEC 07 - Twenty-Second Annual IEEE Applied Power Electronics Conference and Exposition.

[12]  Giovanni Carraro.  Solving high-voltage off-line HB-LED constantcurrent contro-circuit issues , 2007, APEC 07 - Twenty-Second Annual IEEE Applied Power Electronics Conference and Exposition.

[13]  Antonio Lázaro,et al.  New Power Factor Correction AC-DC Converter With Reduced Storage Capacitor Voltage , 2007, IEEE Transactions on Industrial Electronics.

[14]  M.M. Hernando,et al.  A very simple control strategy for power factor correctors driving high-brightness light-emitting diodes , 2008, 2008 Twenty-Third Annual IEEE Applied Power Electronics Conference and Exposition.

[15]  Yu-Kang Lo,et al.  A High-Efficiency AC-to-DC Adaptor With a Low Standby Power Consumption , 2008, IEEE Transactions on Industrial Electronics.

[16]  Wei-Hsu Chang,et al.  A Digital boost converter to drive white LEDs , 2008, 2008 Twenty-Third Annual IEEE Applied Power Electronics Conference and Exposition.