本研究整合降升壓式轉換器及半橋諧振式換流器而成一單級高功因電子安定器之電路架構，以高頻弦波電流驅動複金屬燈。其中，藉由將降升壓式轉換器之儲能電感電流操作於不連續電流導通模式，可於輸入電源端獲得高功率因數；半橋諧振式換流器則用以調整操作頻率，避開音頻共振的區域。
為避免複金屬燈因高頻操作所伴隨而來的音頻共振問題，單級高功因電子安定器將搭配音頻共振偵測電路，隨時偵測複金屬燈音頻共振的發生，即時改變安定器的操作頻率。安定器同時可控制轉換電路之導通率以調節複金屬燈之操作功率，使複金屬燈可因應各種不同的操作條件，皆可維持在額定功率穩定工作。最後，將以不同品牌之70W 複金屬燈為對象，實際設計製作具有自動頻率搜尋功能之單級高功因電子安定器。實驗證實，安定器不論在啟動暫態或穩態工作時，一旦發生音頻共振，都能快速進行頻率搜尋，使複金屬燈穩定操作於無音頻共振的頻率窗口。

A single-stage high-power-factor electronic ballast with auto frequency searching capability provides a compact and efficient solution for ballasting metal halide lamps. The circuit configuration is originated from the integration of a buck-boost converter and a half-bridge resonant inverter. The buck-boost converter is designed to operate in discontinuous current mode (DCM) to improve the input power factor and at the same time to regulate the output lamp power. The resonant inverter operating at a high frequency is adopted to obtain a high efficiency on the power conversion circuit. The control strategy of auto frequency searching is realized by a microprocessor along with the acoustic resonance detection circuit.
To avoid the acoustic resonance, an auto-frequency-searching method is used to search “quite windows” on operating metal halide lamps with the high-frequency electronic ballast. Provided the acoustic resonance should happen to the lamp on operation, the electronic ballast will automatically change the operating frequency until a stable frequency is located. When the operating frequency has been changed, the duty-ratio of the buck-boost converter is adjusted to regulate the lamp power at the rated value. Experimental tests are carried out on a laboratory with 70-W metal halide lamps to verify the effectiveness of the auto-frequency- searching control.

中文摘要 I
英文摘要 II
目錄 III
圖表目錄 V
第一章 簡介 1
1-1研究動機 1
1-2論文大綱 5
第二章 複金屬燈音頻共振現象與偵測電路 6
2-1音頻共振 6
2-1-1音頻共振電氣特性分析 9
2-2音頻共振偵測電路 10
第三章 具自動頻率搜尋功能之單級高功因電子安定器 15
3-1兩級式高頻電子安定器電路架構 15
3-1-1定功率功因修正電路 15
3-1-2負載諧振式換流器 17
3-2單級高功因電子安定器電路架構 19
3-3單級高壓點火電路 20
3-4電路工作原理 21
3-4-1電路工作模式 21
3-5電路特性分析 26
3-5-1降升壓式轉換器 26
3-5-2負載諧振式換流器 28
3-5-2-1換流器等效電路 30
3-5-2-2燈管點燈電壓 32
3-5-2-3串聯諧振電路 32
3-5-2-4輸入阻抗、輸入電流與品質因數 33
3-6自動頻率搜尋控制電路與流程 34
3-6-1自動頻率搜尋控制電路 34
3-6-2自動頻率搜尋控制流程 35
第四章 電路製作與實驗量測 38
4-1電路參數設計 38
4-2實驗量測結果 41
4-3音頻共振偵測電路實驗結果 46
4-3-1複金屬燈啟動於無音頻共振頻率窗口 46
4-3-2複金屬燈工作於音頻共振頻率窗口 48
第五章 結論與討論 52
參考文獻 55

圖表目錄
圖2-1 70W陶瓷放電管複金屬燈 7
圖2-2 燈管穩定工作與音頻共振之光譜能量分佈 8
圖2-3 音頻共振發生之燈管電壓與電流波形 10
圖2-4 音頻共振偵測電路 11
圖2-5 音頻共振頻譜分佈圖 12
圖2-6 燈管電壓波形與音頻共振偵測電壓訊號 13
圖2-6 燈管電壓波形與音頻共振偵測電壓訊號(續) 14
圖3-1 兩級式複金屬燈高頻電子式安定器電路架構 16
圖3-2 降升壓式功因修正電路 17
圖3-3 準半橋串聯諧振並聯負載諧振式換流器 18
圖3-4 具自動頻率搜尋功能之單級高功因電子安定器 19
圖3-5 單級高壓點火電路 21
圖3-6 電路工作模式 23
圖3-6 電路工作模式(續) 24
圖3-7 理論波形 25
圖3-8 電感電流波形 27
圖3-9 輸入電流波形示意圖 28
圖3-10 燈管負載諧振式電子安定器 29
圖3-11 負載諧振式電子安定器之等效電路 30
圖3-12 諧振式電子安定器之戴維寧等效電路 32
圖3-13 自動頻率搜尋控制電路圖 34
圖3-14 自動頻率搜尋控制流程圖 36
圖4-1 輸入電流及儲能電感電流波形 42
圖4-2 輸入電壓、電流及儲能電感電流波形 42
圖4-3 直流鏈電壓啟動暫態至穩態之變化 43
圖4-4 燈管穩態工作之燈管電壓與燈管電流波形 43
圖4-5 主動切換開關之電壓與電流波形 44
圖4-6 燈管功率變化與操作頻率關係圖 45
圖4-7 開關導通率變化關係圖 45
圖4-8 直流鏈電壓變化關係圖 46
圖4-9 燈管啟動於無音頻共振之頻率窗口 47
圖4-10 燈管電壓振幅的變動情形與燈管電流之波形 49
圖4-11 音頻共振偵測訊號與頻率移動之關係圖 49
圖4-12 燈管啟動於21.3kHz之燈管電壓及電流波形 50
圖4-13 音頻共振偵測訊號與頻率移動之關係圖 50
圖4-14 燈管電壓振幅的變動情形與燈管電流之波形 51
圖4-15 音頻共振偵測訊號與頻率移動之關係圖 51
表4-1 安定器電路規範 39
表4-2 安定器電路參數 41
表4-3 音頻共振偵測電路參數 48

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