具有高PF及低THD之AC LED驅動器

本論文提出兩種具有調光之交流發光二極體驅動電路，此架構利用LED串列與電流源作適當的連接，同時搭配以場效可規劃邏輯閘陣列為基礎之所提控制電路，來控制LED串列導通的順序及實現LED調光的功能，與傳統交流發光二極體驅動電路相比，可改善其總電流諧波失真、峯值因數及功率因數，以符合IEC 61000-3-2 Class C的規範。此外，所提交流發光二極體驅動器之主功率級中皆無使用電解電容器與電感器，故其優點為，電路整合容易、可靠度高及壽命長，而且本論文所提的方法並沒有高頻的切換，因此幾乎沒有電磁干擾的問題。本論文將詳述所提具調光交流發光二極體驅動電路之基本操作原理及理論分析，並搭配模擬與實作結果來驗證每一個所提架構之可行性及有效性。

關鍵字

交流發光二極體驅動器；功率因數；峯值因數；總諧波失真；調光控制；無電解電容器；無電感器；數位控制；場效可規劃邏輯閘陣列

並列摘要

In this dissertation, two types of AC light-emitting diode (LED) drivers with dimmable control are presented. By the suitable connection between LED strings and current sources as well as by the proposed control circuits based on digital control using the field programmable gate array (FPGA), the LED strings are turned on sequentially and dimmably controlled. By doing so, the total harmonic distortion (THD), crest factor (CF) and power factor (PF) of the proposed LED drivers are significantly improved as compared with the traditional AC LED drivers, so as to meet the IEC 61000-3-2 Class C standard. In addition, both the proposed AC LED drivers are capacitorless and inductorless in the main power stage as well as have no high- frequency switching. Therefore, these AC LED drivers have several advantages, such as little electromagnetic interference (EMI), easiness of circuit integration, high reliability and long lifetime. In this dissertation, the basic operating principles of the AC LED drivers with dimmable control are described in detail, along with some simulated and experimental results to demonstrate the feasibility and effectiveness of the proposed two types LED drivers.

並列關鍵字

AC LED driver ； power factor ； crest factor ； total harmonic distortion ； dimmable control ； capacitorless ； inductorless ； digital control ； field programmable gate array

參考文獻

[3] N. Narendran and Y. Gu, “Life of LED-based white light sources,” IEEE Journal of Display Technology, vol. 1, no. 1, pp. 167-171, 2005.

[4] J. Shao, “Single stage offline LED driver,” in Proc. IEEE APEC, 2009, pp. 582-586.

[5] J. M. Alonso, J. Vina, D. G. Vaquero, G. Martinez and 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., vol. 59, no. 4, pp. 1689-1697, 2012.

[6] S. Choi and T. Kim, “Symmetric current-balancing circuit for LED backlight with dimming,” IEEE Trans. Ind. Electron., vol. 59, no. 4, pp. 1698-1707, 2012.

[7] K. I. Hwu, Y. T. Yau, and L. L. Lee, “Powering LED using high-efficiency SR flyback converter,” IEEE Trans. Ind. Appl., vol 47, no 1, pp. 376-386, 2011.

國際替代計量

具有高PF及低THD之AC LED驅動器

未授權

主題瀏覽