以電流平衡機制實現單級多燈管LED電源驅動器

A Topology of Single Stage Power Supply for Driver Multi-LEDs with a New Current Balance Scheme

李志平(Chih-Ping Li)

指導教授 ： 涂世雄

中原大學/工學院/電機工程研究所/碩士(2011年)

https://doi.org/10.6840/cycu201100784

摘要

摘要

本文利用單級返馳式拓撲結構，實現多串LED驅動器，帶有隔離、高功率因數、高效率、低成本的發光二極管照明應用，達到最低的元件驅動多串LED的驅動器。

在這篇論文中，我們採用“Portel99“設計原型電路，並使用IC LD7591控制器產生PWM信號來驅動兩組LED串。透過本文提出的新型LED均流技術，可實現平均分配每串LED電流的結果。此外本文也使用了“IsSpice”模擬軟體來驗證實驗數據。可以準確的模擬所有元件的參數和結果。能節省大量的設計開發時間。實驗結果證明，本論文提出之方法可達到較少的零件與簡單的電路即可完成多串LED的驅動。

本論文的貢獻包括三個部分：
1. 結合PFC、返馳式拓墣與LED電流的均流。能僅使用”Single-
stage” 來驅動多串的LED。
2. ”Single-stage”的設計能降低電源損耗、提高效率，使照明更節能。
3. 較少的零件數量能使產品更輕，更薄，更便宜。讓固態照明的
實現更提早實現。

關鍵字

電流平衡技術 ； 多燈管LED 電源驅動器

並列摘要

ABSTRACT

This thesis uses Single-Stage Flyback topology to build a multi-string light-emitting diode (LED) driver, with the advantages of isolation, high power factor (PF), high efficiency and low cost. The light-emitting diode lighting system is a multi-string LED driver with minimum components.

In this thesis, the novel cascade current sharing technology is implemented by using “protel 99” to design the prototype circuit and then using IC LD7591 controller to drive two strings of LED. With our cascade current sharing technology, we can achieve equitable distribution of current in each LED string. In addition, we verify the validity of our technology by “ISSPICE” simulation software and determine the parameters of all components and increase system performance. Therefore, it can save a lot of time and provide proper components. Experimental results show that “Novel Cascade Current share technology” can achieve the advantages of fewer parts and simpler circuit to complete multi-string LED driver design.

The contributions of this thesis include three parts:
1.Combine single stage with current sharing: In our proposal, we combine PFC single stage topology with multi-string LED current sharing technology. It simplifies the structure of LED driver. The LED drivers can driver multi-string LED just only “one stage”. This Technology can substantially reduce development cost and time.

2.Reduce power loss: Single-stage design can reduce a lot of components, so that it reduces the power losses. Because current transmission by components will cause conduction loss, more components will cause more losses.

3.Get a result of smaller size: Fewer components make lighting system lighter, thinner and cheaper. Our proposal reaches a goal that the system size is smaller than others. Small size can reduce the installation space and can make it more convenient to install, and can possibly make solid-state lighting (SSL) more popular in our daily life.

並列關鍵字

New Current Balance Scheme

參考文獻

[26] 許德順，「高功率兩段式安定器之設計及分析」，中原大學碩士論文，民國92年。

[30] 廖顯奎、張詩意，”高功率白光發光二極體之技術發展”，科儀新知第6期第27卷，pp.78-86，2006年6月。

[4] Spiazzi G., Buso S. and Meneghesso G., “Analysis of a highpower-factor electronic ballast for high brightness light emitting diodes,” IEEE Power Electronics Specialists Conference (PESC) Proc., pp. 1494 - 1499, 11 - 14 Sept. 2005.

[5] Chang H. and Lai Y. S., “AC driver and protection circuits for light emitting diode,” Patent pending, July, 2007.

[7] Kanaan H. Y., A. Marquis, and AI-Haddad K., “Small-Signal Modeling and Linear Control of a Dual Boost Power Factor Correction Circuit,” IEEE International Conference on Power Electronics Specialists, 2004,pp.3127-3133.