This study presents a novel high-power light-emitting diode (LED) driver based on chip-level design. We propose a multi-level current approach to LED dimming, rather than pulsed current. The LED driving current can be controlled directly using a digital interface, making it more user-friendly. An analysis of output impedance and driving current demonstrates how the driver can be realised on a single chip. A prototype chip was designed using the second generation TSMC 0.25 μm high-voltage technology. The chip area, including I/O pads and power driver, is only 0.89 mm². The proposed chip is able to drive a 60 W LED panel at maximum output by regulating current in 16 steps for LED dimming. Measurement results indicate that driving efficiency reaches 96% and lighting efficiency is 20% higher than that achieved using pulsed-width modulation. Furthermore, the proposed chip is able to reduce interference, improve lighting efficiency, and prolong the lifespan of LED devices.

References

1. 1)
  - 6. Liao, T.J., Hung, C.C., Chen, C.L.: ‘Source switching circuit with low-gate-driving loss in high-voltage buck light emitting diode driver’, IET Power Electron., 2013, 6, (4), pp. 663–671 (doi: 10.1049/iet-pel.2012.0495).
2. 2)
  - 7. Hsieh, Y.T., Liu, B.D., Wu, J.F., Fang, C.L., Tsai, H.H., Juang, Y.Z.: ‘A high-dimming-ratio LED driver for LCD backlights’, IEEE Trans. Power Electron., 2012, 27, (11), pp. 4562–4570 (doi: 10.1109/TPEL.2012.2188306).
3. 3)
  - 22. http://www.yole.fr/.
4. 4)
  - 4. Lin, R.L., Chang, Y.C., Lee, C.C.: ‘Optimal design of LED array for single-Loop CCM buck–boost LED driver’, IEEE Trans. Power Electron., 2013, 49, (3), pp. 761–768.
5. 5)
  - 12. Moo, C.S., Chen, Y.J., Yang, W.C.: ‘An efficient driver for dimmable LED lighting’, IEEE Trans. Power Electron., 2012, 27, (11), pp. 4613–4618 (doi: 10.1109/TPEL.2012.2183892).
6. 6)
  - 7. Arias, M., Lamar, D.G., Sebastián, J., Balocco, D., Diallo, A.A.: ‘High-efficiency LED driver without electrolytic capacitor for street lighting’, IEEE Trans. Power Electron., 2013, 49, (1), pp. 127–137.
7. 7)
  - 16. Singh, B., Shrivastava, A.: ‘Buck converter-based power supply design for low power light emitting diode lamp lighting’, IET Power Electron., 2014, 7, (4), pp. 946–956 (doi: 10.1049/iet-pel.2013.0391).
8. 8)
  - 23. Wu, M.-T., Lin, C.-L., Lin, C.-C., Chung, L.-P.: ‘Stabilising current driver for high-voltage light-emitting diodes’, IET Power Electron., 2014, 7, (4), p. 1024 (doi: 10.1049/iet-pel.2013.0480).
9. 9)
  - 4. Hwu, K.I., Tu, W.C.: ‘Dimmable driver for light-emitting diode with total harmonic distortion improved’, IET Power Electron., 2012, 5, pp. 59–67 (doi: 10.1049/iet-pel.2011.0035).
10. 10)
  - 5. Cheng, C.A., Cheng, H.L., Yang, F.L., Ku, C.W.: ‘Single-stage driver for supplying high-power light-emitting-diodes with universal utility-line input voltages’, IET Power Electron., 2012, 5, pp. 1614–1623 (doi: 10.1049/iet-pel.2011.0478).
11. 11)
  - 13. Lin, M.S., Chen, C.L.: ‘An LED driver with pulse current driving technique’, IEEE Trans. Power Electron., 2012, 27, (11), pp. 4594–4601 (doi: 10.1109/TPEL.2011.2182212).
12. 12)
  - 19. Tan, S.C.: ‘General n-level driving approach for improving electrical-to-optical energy-conversion efficiency of fast-response saturable lighting devices’, IEEE Trans. Ind. Electron., 2010, 57, (4), pp. 1342–1353 (doi: 10.1109/TIE.2009.2029515).
13. 13)
  - 10. Gacio, D., Alonso, J.M., Garcia, J., Campa, L., Crespo, M.J., Secades, M.R.: ‘PWM series dimming for slow-dynamics HPF LED drivers: the high-frequency approach’, IEEE Trans. Ind. Electron., 2012, 59, (4), pp. 1717–1727 (doi: 10.1109/TIE.2011.2130503).
14. 14)
  - S. Buso . Performance degradation of high-brightness light emitting diodes under DC and pulsed bias. IEEE Trans. Device Mater. Reliab. , 312 - 322
15. 15)
  - 3. Zhang, J., Jiang, T., Zeng, H., Wu, X.: ‘Primary side feedforward control for TRIAC dimmable light emitting diode driver with Constant Power’, IET Power Electron., 2013, 6, (3), pp. 572–580 (doi: 10.1049/iet-pel.2012.0300).
16. 16)
  - 16. Lun, W.K., Loo, K.H., Tan, S.C., Lai, Y.M., Tse, C.K.: ‘Bilevel current driving technique for LEDs’, IEEE Trans. Power Electron., 2009, 24, (12), pp. 2920–2932 (doi: 10.1109/TPEL.2009.2021687).
17. 17)
  - J.M. Alonso , J. Vina , D.G. Vaquero , G. Martinez , R. Osorio . Analysis and design of the integrated double buck-boost converter as a high-power-factor driver for power-LED lamps. IEEE Trans. Ind. Electron. , 4 , 1689 - 1697
18. 18)
  - 21. Hwu, K.I., Tu, W.C., Lai, C.Y.: ‘Light-emitting diode driver with low-frequency ripple suppressed and dimming efficiency improved’, IET Power Electron., 2014, 7, (1), pp. 105–113 (doi: 10.1049/iet-pel.2013.0117).
19. 19)
  - 15. Luo, Q., Zhi, S., Zou, C., Zhao, B., Zhou, L.: ‘Analysis and design of a multi-channel constant current light-emitting diode driver based on high-frequency AC bus’, IET Power Electron., 2013, 6, (9), pp. 1803–1811 (doi: 10.1049/iet-pel.2012.0696).
20. 20)
  - 9. Ma1, H., Zheng, C., Yu, W., Gu, B., Lai, J.S., Feng, Q.: ‘Bridgeless electrolytic capacitor-less valley-fill AC/DC converter for offline Twin-Bus light-emitting diode lighting application’, IET Power Electron., 2013, 6, (9), pp. 1132–1141.
21. 21)
  - 17. Ng, S.K., Loo, K.H., Ip, S.K., Lai, Y.M., Tse, C.K., Mok, K.T.: ‘Sequential variable bilevel driving approach suitable for use in high-color-precision LED display panels’, IEEE Trans. Ind. Electron., 2012, 59, (12), pp. 4637–4645 (doi: 10.1109/TIE.2011.2180490).
22. 22)
  - 20. Saponara, S., Pasetti, G., Costantino, N., Tinfena, F., D'Abramo, P., Fanucci, L.: ‘A flexible LED driver for automotive lighting applications: IC design and experimental characterization’, IEEE Trans. Power Electron., 2012, 27, (3), pp. 1071–1075 (doi: 10.1109/TPEL.2011.2174653).

Chip implementation of high-efficient light-emitting diode dimming driver for high-power light-emitting diode lighting system

References

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