Universal-input single-stage PFC flyback with variable boost inductance for high-brightness LED applications

This paper presents a single-stage flyback power-factor-correction circuit with a variable boost inductance for high-brightness light-emitting-diode applications for the universal input voltage (90-270 Vrms). The proposed circuit overcomes the limitations of the conventional single-stage PFC flyback with a constant boost inductance, which cannot be designed to achieve a practical bulk-capacitor voltage level (i.e., less than 450 V) at high line while meeting the IEC 61000-3-2 Class C line current harmonic limits at low line. According to the proposed variable boost inductance method, the boost inductance is constant in the high-voltage range and it is reduced in the low-voltage range, resulting in discontinuous-conduction-mode operation and a low total harmonic distortion (THD) in both the high-voltage and low-voltage ranges. Measurements obtained on a 24-V/91-W experimental prototype are as follows: PF = 0.9873, THD = 12%, and efficiency = 88% at nominal low line (120 Vrms); and PF = 0.9474, THD = 10.39%, and efficiency = 91% at nominal high line (230 Vrms). The line current harmonics satisfy the IEC 61000-3-2 Class C limits with enough margin.

[1]  Fred C. Lee,et al.  Voltage and current stress reduction in single-stage power factor correction AC/DC converters with bulk capacitor voltage feedback , 2002 .

[2]  Milan M. Jovanovic,et al.  Single-Stage Flyback Power-Factor-Correction Front-End for HB LED Application , 2009, 2009 IEEE Industry Applications Society Annual Meeting.

[3]  Masao Nakagawa,et al.  Fundamental analysis for visible-light communication system using LED lights , 2004, IEEE Transactions on Consumer Electronics.

[4]  Pan TianFu,et al.  An Improved Single-Stage Flyback PFC Converter for High-Luminance Lighting LED Lamps , 2007, 2007 8th International Conference on Electronic Measurement and Instruments.

[5]  S. Yuvarajan,et al.  Quasi-Active Power Factor Correction Circuit for HB LED Driver , 2007, IEEE Transactions on Power Electronics.

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

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

[8]  L. Huber,et al.  Single-stage single-switch input-current-shaping technique with reduced switching loss , 2000 .

[9]  L.G. de Vicuna,et al.  A sliding mode controller for the current-source parallel-resonant converter with zero-voltage switching , 1997, Proceedings of the IECON'97 23rd International Conference on Industrial Electronics, Control, and Instrumentation (Cat. No.97CH36066).

[10]  R. Redl,et al.  A new family of single-stage isolated power-factor correctors with fast regulation of the output voltage , 1994, Proceedings of 1994 Power Electronics Specialist Conference - PESC'94.

[11]  S. Ben-Yaakov,et al.  A self-adjusting sinusoidal power source suitable for driving capacitive loads , 2004, Nineteenth Annual IEEE Applied Power Electronics Conference and Exposition, 2004. APEC '04..

[12]  William Gerard Hurley,et al.  Quasi-active power factor correction with a variable inductive filter: theory, design and practice , 2003 .

[13]  Shu Fan Lim,et al.  Non linear inductor design for improving light load efficiency of boost PFC , 2009, 2009 IEEE Energy Conversion Congress and Exposition.

[14]  R. E. Allison.  A Variable Inductor , 1953 .

[15]  S. Ben-Yaakov,et al.  A current-controlled variable-inductor for high frequency resonant power circuits , 1994, Proceedings of 1994 IEEE Applied Power Electronics Conference and Exposition - ASPEC'94.

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

[17]  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.