在照明的領域中，螢光燈的使用甚是廣泛。而基於節約用電與照明品質的雙重需求，在螢光燈具中搭配採用電子式安定器實有其必要性。而為了符合電器用品的高功因要求，電子安定器中之功因修正電路部份，多有採用主動式功因修正的方式；但為了成本與市場競爭性的因素，亦有許多小型螢光燈具採用被動式功因修正者，如填谷式濾波電路即是。其具有高功因與電路簡單成本低廉的優點，但卻會使得燈管電流具有偏高的峰值因數，而致傷害螢光燈管之電極與縮短燈管之使用壽命。
在本論文中提出以脈寬調變之方法，來降低填谷式電子安定器所導致之偏高的燈管電流峰值因數。其饋入填谷式濾波電路之直流鏈電壓波形，以控制晶體開關之切換責任周期，使其能有效的抑制燈管電流之峰值，進而改善燈管電流峰值因數。文中介紹脈寬調變之控制方塊圖並推導控制方程式，更進一步地將燈管電流峰值與有效值予以函數化，因而能尋求得到燈管電流峰值因數之最小改善值。本文所採之控制改善方式無須使用電流感測回授控制，因而使得控制電路簡單易實現且成本低廉。而在全區的脈寬調變範圍裡，換流器之晶體開關可完全做到零電壓切換。此外，由於採取固定頻率的控制方式，可使得EMI濾波電路易於設計且有較佳之濾波效果。在電路模擬中以四種小型螢光燈作為模擬標的，從其燈管電流峰值因數的改善結果來看，本文所提出之脈寬調變的改善方法，對於各種低啟動電壓之小型螢光燈都具有普遍的適用性。最後經由電路實作獲得良好的驗證，實測其燈管電流峰值因數可由1.9改善至1.58，電源功率因數約為0.96，電流總諧波失真(THDI)為29.3%。

Fluorescent lamps are used generally in lighting domain. Due to the demand of energy saving and lighting quality, it is necessary to adopt the electronic ballast in the lighting fixture. Besides, in order to gain high power factor, the active power factor correction circuit is usually used in the electronic ballast. However, due to the considerations of cost-effective and market-competitive, the valley-filled PFC circuit is extensively applied in the small or compact fluorescent lamps. It has merits of high power, simple structure and low cost. However, it also makes the lamp has an over high current crest factor, which is harmful to the electrodes of lamp and shorten the lifetime of lamps.
In this dissertation, a PWM method to improve the lamp current crest factor of the valley-filled electronic ballast is presented. The proposed method controls switching duty ratio by feeding forward the dc-link voltage waveform of the valley-filled filter. It decreases the duty ratio with rising of dc-link voltage. Therefore, the proposed method can restrain the lamp peak current and improve the lamp current crest factor. The control block diagram and basic theory are introduced to explain the improving principle. Furthermore, the functions of lamp effective current and peak current can be calculated to gain the minimum current crest factor. The control circuit is simple, economy and unnecessary to use the feedback control and current sensor. Moreover, the proposed method can achieve soft-switching (zero voltage switching) in whole modulation range. Additionally, fixed switching frequency operation provides good filer effect and simplified EMI filter design. Finally, the computer simulation and circuit implementation verify the proposed method. The experimental results demonstrate the lamp current crest factor was reduced from 1.9 to 1.58, the ac line power factor is 96% and the input current THD is 29.3%.

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