JSTS:Journal of Semiconductor Technology and Science

  • 제15권3호
  • /
  • Pages.390-396
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  • 2015
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  • 1598-1657(pISSN)
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  • 2233-4866(eISSN)
대한전자공학회 (The Institute of Electronics and Information Engineers)
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A Direct AC Driver with Reduced Flicker for Multiple String LEDs

  • Kim, Junsik (Dept. of Electronics and Electrical Engineering, Dankook University) ;
  • Park, Shihong (Dept. of Electronics and Electrical Engineering, Dankook University)
  • 투고 : 2015.01.21
  • 심사 : 2015.05.12
  • 발행 : 2015.06.30
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초록

This paper proposes a method to reduce flicker when running an AC-power direct-drive type multiple string LED driver IC. The proposed method greatly decreases flicker using one capacitor and P-type MOSFET transistor (PMOS). The flicker index (FI) was reduced by over 40% through experiments, and less than half of the conventional external components are used in the passive valley fill circuit, which gives an advantage in the cost and utilization in the design of LED lighting modules. The 0.35 um 700 V BCD process was used to manufacture this LED driver.

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참고문헌

  1. J. Kim, J. Lee, S. Park, "A Soft Self-Commutating Method Using Minimum Control Circuitry for Multiple-String LED Drivers", 2013 IEEE International Solid-State Circuits Conference, pp 376-378, Feb. 2013
  2. S. Cha, D. Park, Y. Lee, et al, "AC/DC Converter Free LED Driver for Lightings," IEEE International Conference on Consumer Electronics, pp. 706-708, Jan. 2012.
  3. K. Hwu, et al, "A High Brightness Light-Emitting Diode Driver with Power Factor and Total Harmonic Distortion Improved," IEEE Applied Electronics Conference and Exposition, pp. 713- 717, Mar. 2011
  4. E. Kang, J. Kim, D. Oh, and D. Min, "A 6.8-W Purely-Resistive AC Light-Emitting Diode Driver Circuit with 95% Power Factor," IEEE International Conference on Power Electronics and ECCE Asia, pp. 778-781, May 30-June 3, 2011
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  9. Texas Advanced Optoelectonic Solutions, "Radiometric and Photometric Measurements with TAOS PhotoSensors", [online] http://ams.com/eng/ Products/Light-Sens...nt-Light-Sensor- ALS/Technical-Documents.