簡易檢索 / 詳目顯示
| 研究生： |
李勇進 Yong-chin Lee |
|---|---|
| 論文名稱： |
高效率LED動態顯示看板電源供應器之研製 Design and Implementation of a High Efficiency Power Supply of LED Dynamic Display Board |
| 指導教授： |
陳南鳴
Nan-Ming Chen |
| 口試委員: |
呂錦山
Ching-Shan Leu 劉國基 Kuo-Chi Liu |
| 學位類別： |
碩士 Master |
| 系所名稱： |
電資學院 - 電機工程系 Department of Electrical Engineering |
| 論文出版年： | 2011 |
| 畢業學年度： | 99 |
| 語文別： | 中文 |
| 論文頁數： | 96 |
| 中文關鍵詞： | 轉換器 、動態顯示看板 、諧振式 、功因修正 、電源供應器 |
| 外文關鍵詞： | LED, PFC, LLC, converter, power factor corrector, LLC resonant converter |
| 相關次數： | 點閱：795 下載：18 |
| 分享至: |
| 查詢本校圖書館目錄 查詢臺灣博碩士論文知識加值系統 勘誤回報 |
本論文主要研製一高效率LED動態顯示看板電源供應器，以及對LED驅動電路之改善與規劃。電源供應器架構為一雙功率級的架構，在雙功率級的架構下，僅使用單顆控制IC來作控制。前級為升壓型功率因數修正器，後級為LLC半橋諧振式轉換器。但後級的LLC半橋諧振式轉換器是以開迴路的方式做控制，轉換器的上下橋開關信號則是由同步驅動電路來驅動，而此驅動信號會與升壓型功率因數修正器之驅動信號同步，使LLC半橋諧振式轉換器操作在定頻的模式下。故本研究將切換頻率設計在諧振頻率點上，可降低轉換器之切換損失和導通損失，以達到高轉換效率之訴求。此外，輸出電壓控制迴路則是從後級變壓器的第三繞組擷取迴授電壓信號作控制，此方式不需該變壓器一、二次側的隔離電路，可降低轉換器電路成本。
在LED動態顯示看板驅動電路方面，則是沿用文獻[1]所提出的LED電壓迴授電路。由於顯示看板紅光LED與藍、綠光LED的Vf相差甚大，故本研究規畫LED動態顯示看板驅動電路之架構分成兩組驅動電路來作驅動。此外，再針對LED電壓迴授電路做改善，改善前的LED電壓迴授電路在實際的LED動態顯示看板調光下，有將近0.7V的多餘電壓降。本研究改善LED電壓迴授電路之速度響應，使得降壓轉換器之輸出電壓可提供更適當的電壓值，去驅動LED動態顯示看板之紅光、綠光和藍光LED，以降低看板之功率損耗。
The main purpose of this thesis is to investigate and implement a high efficiency power supply for LED dynamic display board. LED driver circuits are designed with improvement of LED voltage feedback circuits. Only one control IC is used in the two power stage structure of the LED power supply. The front-end part of the converter is a boost power factor corrector (PFC). The second power stage is a half-bridge LLC resonant converter. The control method of the second stage uses open loop control. The driving signal of its power switch is driven synchronously with the boost power factor corrector. The half-bridge resonant converter is operated in fixed frequency mode at the first resonant frequency. The power supply can reduce switching loss and conduction loss to achieve high conversion efficiency. Furthermore, the feedback voltage of the output voltage control circuit is taken from the tertiary winding of the LLC converter transformer. This method needs no isolation circuit between primary and secondary windings of the transformer, so that the power supply cost can be reduced.
In LED driver circuit design, references [1] proposed the LED voltage feedback control circuit. It is applied to LED display board circuit design. Since the forward voltages are different between red LED and blue or green LED, this research uses two driving circuits to drive R and GB LED separately. Moreover, the voltage feedback circuit is improved. When an LED dynamic display board is under dimming control condition, there was an excess voltage drop of approximately 0.7V. This design reduces the excess voltage and improves the speed response of the voltage feedback circuit so that the buck converter output voltages can provide more appropriate voltages to drive red, green and blue LEDs of the LED dynamic display board to reduce the power loss of it.
[1] 李明學，「彩色動態廣告看板LED驅動電路之研究」，國立台灣科技大學電機工程系碩士論文，民國九十七年。
[2] IBTS(Industrial Bank of Taiwan Securities)整理http://www.china-led
.net/src/20080530-2.jpg
[3] 光磊科技，http://www.optotech.com.tw/ch/tch_index.aspx
[4] 松下電器，http://www.panasonic.com.tw/
[5] S.Kumar, “Low Power LED-Based Marquee Systems,” United States Patent 20070171158, Jul. 2007.
[6] 戲骨光電科技公司http://www.taiwanpage.com.tw/co/co2/introduce.
cfm?id=107517
[7] 莊曜全，「具功因修正之全橋相移零電壓切換直流電源供應器之設計與製作」，國立台灣科技大學電機工程學系碩士論文，民國九十一年五月。
[8] 劉國基、陳南鳴、李勇進、李明學，「降低功率耗損的電源供應器」，台灣專利申請編號 99107277，民國九十九年三月十二日。
[9] 立錡科技，http://tw.richtek.com/
[10] 劉泰錫，「三相交錯式升壓型功率因數修正器」，國立台灣科技大學電子工程學系碩士論文，民國九十五年六月。
[11] W. Tang, R. Ridley, F. C. Lee, “Small-Signal Modeling of Average Current-mode Control,” Proceedings of VPEC Seminar, Blacksburg, USA, pp. 193-201, April 1991.
[12] C. Zhou, M. M. Jovanović, “Design Trade-offs in Continuous Current-Mode Controlled Boost Power-Factor Correction Circuits,” Proceedings of High Frequency Power Conversion Conference, Richmond, USA, pp. 209-220, May 1992.
[13] 謝士弘，「LLC半橋串聯諧振式轉換器之設計考量與研製」，國立台灣科技大學電子工程學系碩士論文，民國九十六年七月。
[14] G. C. Hsieh, C. Y. Tsai, and S. H. Hsieh,“Design Considerations for LLC Series-resonant Converter in Two-resonant Regions,” Proceedings of IEEE PESC’07, Taipei, Taiwan, Oct. 2007.
[15] 徐維利，「同步整流式LLC半橋串聯諧振轉換器之研製」，國立台灣科技大學電子工程學系碩士論文，民國九十五年七月。
[16] B. Yang, Topology Investigation for Front End DC/DC Power Conversion for Distributed Power System, Ph. D. Dissertation, Virginia Tech, Sep. 2003.
[17] Philip C. TODD, “UC3854 Controlled Power Factor Correction Circuit Design,” http://focus.ti.com/lit/an/slua144/slua144.pdf
[18] 梁適安，「高頻交換式電源供應器原理與設計」，全華圖書股份有限公司，民國八十四年。
[19] Chang Sung Corporation, “Magnetic Powder Cores Datasheet”, Chang Sung Corporation, 2006.
[20] 楊詠迪，「雙輸出串聯諧振轉換器研製」，國立台灣科技大學電子工程系碩士論文，民國九十八年六月。
[21] TDK Corporation, “Ferrite for Switching Power Supplies Introduction”, TDK Corporation, 2005.
[22] 陳揚斌，「高效率LLC同步整流串聯諧振轉換器之研製」，國立台灣科技大學電子工程系碩士論文，民國九十八年一月。
[23] CD4098 Datasheet, http://pdf1.alldatasheet.com/datasheet-pdf/view/
26897/TI/CD4098.html, Texas Instruments, Nov. 2004.
