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標題: 多通道可調LED數之高精準恆流LED驅動電路
A Multi-Channel LED Driver with Accurate Current Control and Adjustable LED Numbers
作者: 柯佩瑋
Ko, Pei-Wei
關鍵字: LED driver;發光二極體驅動;boost converter;升壓轉換器
出版社: 電機工程學系所
引用: [1] 電子工程專輯, [2] 奇摩理財新聞, 研究報告, [3] MoneyDJ理財網, 財金知識庫, [4] 自動化在線, [5] R. C. Chang, H.-M. Chen, and P.-S. Lei, “An exact, high-efficiency PFM DC-DC boost converter with dynamic stored energy,” in Proc. IEEE International Conference on Electronics, Circuits and Systems, Aug. 2008, pp.622-625. [6] C.-J. Cheng, C.-J. Wu, and S.-Y. Lee, “Programmable pacing channel with a fully on-chip LDO regulator for cardiac pacemaker,” in Proc. IEEE Conference on Asian Solid-State Circuits, Dec. 2008, pp.285-288. [7] 魏嘉玲, 楊琇惠, “A step-down regulated charge-pump DC-DC converter,” 國立成功大學電機工程學系碩士論文, 中華民國九十七年六月 [8] 簡峯偉, “A high efficiency and wide range dual-mode buck converter,” 國立中興大學電機工程學系碩士論文, 中華民國九十五年六月 [9] 郭榮凱, “A dual-mode DC/DC buck converter with fast transient response control,” 國立中興大學電機工程學系碩士論文, 中華民國九十六年六月 [10] 周志敏, 周紀海, 紀愛華, “DC/DC模組化實用電路,” 全華科技圖書股份有限公司, 初版一刷, Feb.2006. [11] WIKIPEDIA, [12] 晶詠科技, [13] MOBILE01, [14] EVERTEO, [15] LEDinside of TRENDFORCE Corp. [16] 億光電子, [17] Y.-Q. Hu, and M. M. Jovanovic, “LED driver with self-adaptive drive voltage,” IEEE Transaction on Power Electronics, vol. 23, no.6, pp.3116-3125, Dec. 2008. [18] J.-H. Park, and H.-D. Yoon, “LED Driver with self-optimized channel voltage: A switch-mode voltage regulator optimizes an active current regulator for a LED driver,” in Proc. IEEE International Conference on SoC Design, Mar. 2010, pp.516-519. [19] W. Y. Leung, T. Y. Man, and M. Chan, “A high-power-LED driver with power-efficient LED current sensing circuit,” in Proc. IEEE Conference on European Solig-State Circuits, Nov. 2008, pp.354-357. [20] C.-L. Chiu, and K.-H. Chen, “A high accuracy current-balanced control technique for LED backlight,” in Proc. IEEE Conference on Power Electronics Specialists, Aug. 2008, pp.4202-4206. [21] 華昕科技,
本電路使用TSMC 0.35μm 2P4M 3.3V/5V Mixed Signal CMOS製程技術,晶片面積大小為1.328×1.328mm2,晶片內建實用性功能控制電路與接腳,可直接應用於汽車電子設備上。

In recent years, we have gradually accepted the concept of the energy conservation and reducing carbon dioxide emission, and the mainstream of the design and manufacturing idea for daily supplies will follow it. Therefore, it is very important for increasing the efficiency when we make use of energy. It is possible to conserve electricity energy by using some suitable components, LED especially. Long life of LED is its merit, and LED can be widely applied in many products, such as the lighting and lamps, large-scale electronic monitors, back lights, vehicles electronic parts, portable electronic devices and so on. In this thesis, it is mainly aimed at the LED driver to have a discussion about reducing the electricity energy loss and enhancing the accuracy of lower error driving current, and looking forward to more practical applications for automobile equipments that are necessary, for instance, the rear light, the turn signal, the head light, the brake light, the lighting, the indicator, the back light signal, the head light, the brake light, the lighting, the indicator, the back light panel, etc. When the battery power is unstable, or insufficient battery charge by the problems of charging circuit, engine or generator, it can assure the reliability of driving safety.
In addition to the system clock generator and the function control circuits, the circuit designed in this thesis makes use of a method of Automatic Pulse Frequency Modulation Control Output to design the boost converter circuits. It can supply a power source with preset and regulated voltage, offer a number of independent circuits for current balance which could preset different current in demand, and also control the lowest loading voltage automatically. In the experimental model, boost converter output voltage will rise to the preset value of 15.6V. The three current balance circuits provide the three LED strings with stable regulated current, respectively. Each LED string can serially connect from 1 up to 3 LEDs at will. The total loading current achieves approximately 150mA. Although the LED string has replaced the different number of LEDs, it can still maintain the same current, and the current error coefficient is just only 0.054%.
The circuit was designed by using TSMC 0.35μm 2P4M 3.3V/5V Mixed Signal CMOS fabrication process. The chip size is 1.328×1.328 mm2 .The chip was built in multi-function control circuit with pin out so that, it is so easy to be used for automobile electronic equipments.
其他識別: U0005-1708201118323400
Appears in Collections:電機工程學系所

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