The Transactions of the Korean Institute of Power Electronics (전력전자학회논문지)

The Korean Institute of Power Electronics (전력전자학회)
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New LED Current Balancing Scheme Using C-Fed Z-Source Converter

전류형 Z-Source 컨버터를 이용한 새로운 LED 전류 밸런싱 기법

  • Hong, Daheon (School of Energy Engineering, Kyungpook National University) ;
  • Cha, Honnyong (School of Energy Engineering, Kyungpook National University)
  • Received : 2020.07.21
  • Accepted : 2020.09.17
  • Published : 2021.02.20
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Abstract

In multi-string light-emitting diode (LED) driver system, current balancing is crucial because the brightness of LED is directly related to its forward current. This paper presents a novel LED current balancing topology using current-fed Z-source converter. With the proposed structure, currents flowing through two LED strings are automatically balanced owing to the charge-balance condition on capacitors. Operation of the proposed converter is simple and the proposed converter uses only one active switch and one diode. Moreover, low-side gate driving can be used to operate the active switch. To verify the operation of the proposed LED current balancing converter, a prototype is built and tested with different numbers of LEDs.

Keywords

Acknowledgement

본 연구는 산업통상자원부(MOTIE)와 한국에너지기술평가원(KETEP)의 지원을 받아 수행한 연구과제입니다. (No. 20194030202310)

References

  1. C. Y. Park, J. W. Song, and J. W. Yoo, "The reduction method of strings current unbalancing in LED lighting driving system," Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, Vol. 27, No. 5, pp. 26-32, May 2013. https://doi.org/10.5207/JIEIE.2013.27.5.026
  2. S. H. Lee, S. H. Cho, C. W. Roh, S. S. Hong, and S. K. Han, "A new current-balancing multi-channel LED driver for a large screen LCD backlight unit," The Transactions of the Korean Institute of Power Electronics, Vol. 15, No. 2, pp. 111-118, Apr. 2010. https://doi.org/10.6113/TKPE.2010.15.2.111
  3. Y. Hu and M. M. Jovanovic, "LED driver with self-adaptive drive voltage," IEEE Transactions on Power Electronics, Vol. 23, No. 6, pp. 3116-3125, Nov. 2008. https://doi.org/10.1109/TPEL.2008.2004558
  4. X. Wu, Z. Wang, and J. Zhang, "Design considerations for dual-output quasi-resonant flyback LED driver with current-sharing transformer," IEEE Transactions on Power Electronics, Vol. 28, No. 10, pp. 4820-4830, Oct. 2013. https://doi.org/10.1109/TPEL.2012.2234480
  5. K. I. Hwu, W. C. Tu, and M. J. Hong, "A dimmable LED driver based on current balancing transformer with magnetizing energy recycling considered," Journal of Display Technology, Vol. 10, No. 5, pp. 388-395, May 2014. https://doi.org/10.1109/JDT.2014.2301883
  6. Y. Lin, H. Chiu, Y. Lo, and C. Leng, "LED backlight driver circuit with dual-mode dimming control and current-balancing design," IEEE Transactions on Industrial Electronics, Vol. 61, No. 9, pp. 4632-4639, Sep. 2014. https://doi.org/10.1109/TIE.2013.2288234
  7. J. Wang, J. Zhang, X. Huang, and L. Xu, "A family of capacitive current balancing methods for multi-output LED drivers," in 2011 Twenty-Sixth Annual IEEE Applied Power Electronics Conference and Exposition (APEC), Fort Worth, TX, pp. 2040-2046, 2011.
  8. X. Liu, Q. Yang, Q. Zhou, J. Xu, and G. Zhou, "Single-stage single-switch four-output resonant LED driver with high power factor and passive current balancing," IEEE Transactions on Power Electronics, Vol. 32, No. 6, pp. 4566-4576, Jun. 2017. https://doi.org/10.1109/TPEL.2016.2594836
  9. S. Choi and T. Kim, "Symmetric current-balancing circuit for LED backlight with dimming," IEEE Transactions on Industrial Electronics, Vol. 59, No. 4, pp. 1698-1707, Apr. 2012. https://doi.org/10.1109/TIE.2011.2138112
  10. K. I. Hwu and W. Z. Jiang, "Nonisolated two-channel LED driver with automatic current balance and zero-voltage switching," IEEE Transactions on Power Electronics, Vol. 31, No. 12, pp. 8359-8370, Dec. 2016. https://doi.org/10.1109/TPEL.2016.2515088
  11. K. I. Hwu and W. Z. Jiang, "Single-switch coupled-inductor-based two-channel LED driver with a passive regenerative snubber," IEEE Transactions on Power Electronics, Vol. 32, No. 6, pp. 4482-4490, Jun. 2017. https://doi.org/10.1109/TPEL.2016.2599271
  12. K. I. Hwu and W. Z. Jiang, "Nonisolated two-phase interleaved LED driver with capacitive current sharing," IEEE Transactions on Power Electronics, Vol. 33, No. 3, pp. 2295-2306, Mar. 2018. https://doi.org/10.1109/TPEL.2017.2695006
  13. F. Z. Peng, "Z-source inverter," IEEE Transactions on Industry Applications, Vol. 39, No. 2, pp. 504-510, Mar./Apr. 2003. https://doi.org/10.1109/TIA.2003.808920
  14. H. Shen, B. Zhang, D. Qiu, and L. Zhou, "A common grounded Z-source DC-DC converter with high voltage gain," IEEE Transactions on Industrial Electronics, Vol. 63, No. 5, pp. 2925-2935, May 2016. https://doi.org/10.1109/TIE.2016.2516505
  15. H. Shen, B. Zhang, and D. Qiu, "Hybrid Z-source boost DC-DC converters," IEEE Transactions on Industrial Electronics, Vol. 64, No. 1, pp. 310-319, Jan. 2017. https://doi.org/10.1109/TIE.2016.2607688
  16. A. Torkan and M. Ehsani, "A novel nonisolated Z-source DC-DC converter for photovoltaic applications," IEEE Transactions on Industry Applications, Vol. 54, No. 5, pp. 4574-4583, Sep./Oct. 2018. https://doi.org/10.1109/TIA.2018.2833821