High Power Factor AC–DC LED Driver With Film Capacitors

In this paper, a new method is proposed to eliminate electrolytic capacitors in a two-stage ac-dc light-emitting diode (LED) driver. DC-biased sinusoidal or square-wave LED driving-current can help to reduce the power imbalance between ac input and dc output. In doing so, film capacitors can be adopted to improve LED driver's lifetime. The relationship between the peak-to-average ratio of the pulsating current in LEDs and the storage capacitance according to given storage capacitance is derived. Using the proposed “zero-low-level square-wave driving current” scheme, the storage capacitance in the LED driver can be reduced to 52.7% comparing with that in the driver using constant dc driving current. The input power factor is almost unity, which complies with lighting equipment standards such as IEC-1000-3-2 for Class C equipments. The voltage across the storage capacitors is analyzed and verified during the whole pulse width modulation dimming range. For the ease of dimming and implementation, a 50 W LED driver with zero-low-level square-wave driving current is built and the experimental results are presented to verify the proposed methods.

[1]  H. D. L. Dzn.  Research into the dynamic nature of the human fovea-cortex systems with intermittent and modulated light. I. Attenuation characteristics with white and colored light. , 1958 .

[2]  Frederick J. Bueche,et al.  Capacitors , 2018, Introductory Electrical Engineering with Math Explained in Accessible Language.

[3]  M. J. Mayer,et al.  Foveal flicker sensitivity in healthy aging eyes. I. Compensating for pupil variation. , 1988, Journal of the Optical Society of America. A, Optics and image science.

[4]  M. J. Mayer,et al.  Foveal flicker sensitivity in healthy aging eyes. II. Cross-sectional aging trends from 18 through 77 years of age. , 1994, Journal of the Optical Society of America. A, Optics, image science, and vision.

[5]  T. Kurachi,et al.  Analysis of ripple current of an electrolytic capacitor in power factor controller , 1995, Proceedings of 1995 International Conference on Power Electronics and Drive Systems. PEDS 95.

[6]  J.C. Lavandero,et al.  Instrumentation and methodology for revision of European flicker threshold , 2002, 10th International Conference on Harmonics and Quality of Power. Proceedings (Cat. No.02EX630).

[7]  Nadarajah Narendran,et al.  Impact of dimming white LEDs: chromaticity shifts due to different dimming methods , 2005, SPIE Optics + Photonics.

[8]  S. Buso,et al.  Analysis of a High-Power-Factor Electronic Ballast for High Brightness Light Emitting Diodes , 2005, 2005 IEEE 36th Power Electronics Specialists Conference.

[9]  E. Waffenschmidt,et al.  Driver Electronics for LEDs , 2006, Conference Record of the 2006 IEEE Industry Applications Conference Forty-First IAS Annual Meeting.

[10]  K. Wada,et al.  A Single-Phase Grid-Connected Inverter with a Power Decoupling Function , 2010, 2007 IEEE Power Electronics Specialists Conference.

[11]  D. Weng,et al.  Quasi-Active Power Factor Correction Circuit for HB LED Driver , 2007, APEC 07 - Twenty-Second Annual IEEE Applied Power Electronics Conference and Exposition.

[12]  Roger Shuttleworth,et al.  Design of a LED street lighting system , 2008 .

[13]  S. Hui,et al.  Current source ballast for high power lighting emitting diodes without electrolytic capacitor , 2008, 2008 34th Annual Conference of IEEE Industrial Electronics.

[14]  S. Buso,et al.  Performance Degradation of High-Brightness Light Emitting Diodes Under DC and Pulsed Bias , 2008, IEEE Transactions on Device and Materials Reliability.

[15]  Ajeet Rohatgi,et al.  Development of a Methodology for Improving Photovoltaic Inverter Reliability , 2008, IEEE Transactions on Industrial Electronics.

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

[17]  M. Rico-Secades,et al.  Dimming of High-Brightness LEDs by Means of Luminous Flux Thermal Estimation , 2009, IEEE Transactions on Power Electronics.

[18]  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).

[19]  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.

[20]  Andres Barrado,et al.  HBLED driving strategy with reduced storage capacitor based on load modularization , 2011, 2011 Twenty-Sixth Annual IEEE Applied Power Electronics Conference and Exposition (APEC).

[21]  X. Ruan,et al.  A flicker-free electrolytic capacitor-less ac-dc LED driver , 2011, 2011 IEEE Energy Conversion Congress and Exposition.

[22]  R. Zane,et al.  Minimizing Required Energy Storage in Off-Line LED Drivers Based on Series-Input Converter Modules , 2011, IEEE Transactions on Power Electronics.

[23]  Xinbo Ruan,et al.  Reducing Storage Capacitor of a DCM Boost PFC Converter , 2012, IEEE Transactions on Power Electronics.

[24]  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.

[25]  P. T. Krein,et al.  Minimum Energy and Capacitance Requirements for Single-Phase Inverters and Rectifiers Using a Ripple Port , 2012, IEEE Transactions on Power Electronics.