LED照明驅動電路與燈具結構最佳化研究

The Study of LED Lighting Driver and Lighting Module Structure Optimization

張文忠(Wen-Chung Chang)

指導教授 ： 莊賦祥

國立虎尾科技大學/電機資訊學院/光電與材料科技研究所/碩士(2013年)

摘要

照明是人類生活的基本需求，由於近期環保意識抬頭。相較於一般傳統燈具，發光二極體更為省電、污染低等優點，讓許多公司投入LED燈具的開發，作為取代傳統燈泡的重要光源。LED在發光時會產生熱量，如果燈具的散熱設計不佳，會影響到LED的發光效率與壽命，最重要是選擇最適合之導熱材料，以提昇整體電子產品之散熱效能。
本研究規劃設計一種具有高功率因數的返馳式轉換器，所設計電源供應器採用邊界導通模式的架構。其功率開關因零電流切換的特性，可降低切換時損失。且各串LED的輸出電流不會隨著輸出端的負載變化而隨之變化，為了提升功率因數，更進一步使用功率因數修正IC組成主動式功率因數校正電路，其功率因數在輸入電壓110 Vac、220 Vac時皆達到0.95以上，轉換效率也皆有80%以上。
本研究同時檢驗LED元件的特性，藉著替換不同類型的板材與散熱材，找出最佳化的散熱模組型式，實驗中散熱基座連接於LED發光模組上，將LED發光時所產生的熱量吸收，藉由傳導方式散熱，傳送至周遭環境中。

關鍵字

返馳式轉換器 ； LED散熱模組 ； LED照明

並列摘要

Lighting is the basic needs of human life, due to the recent rise of environmental awareness. Compared to the conventional lighting, light emitting diodes are more energy-efficient and low pollution. Many companies put into developing LED lamps, which will replace traditional lamps as light sources in the future.
The study planning designs a high power-factor flyback converters. The design of the power supply used boundary conduction mode structures. The power switch has zero-current-switching characteristics, so the switching losses can be reduced. The output current of each LED series will not change along the output load. In order to improve the power-factor, we further use the power factors corrector IC composed of an active power factor correction circuit. The power factors at input voltage of 110Vac and 220Vac all reach above 0.95. And the conversion efficiency reach more than 80%.
The study also tested the characteristics of LED devices, to substitute different types of plates and thermal materials. The best type of thermal module was found. The heat dissipation plate was bonded on the LED modules in the experiment. When LEDs emit light, the generated heat will be absorbed by the dissipation of heat conduction, and then transferred to the surrounding environment.

並列關鍵字

Flyback converters ； LED cooling modules ； LED lighting

參考文獻

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