臺灣博碩士論文加值系統

本論文主要是利用Simplis模擬軟體來探討差頻對直流降壓轉換器的影響，探討的範圍包含差頻對單相電壓模式、峰值電流模式及雙相雙迴路模式降壓轉換器的影響，了解兩種模式之優缺點及各個模式對於差頻之處理方式。模擬在直流降壓轉換器的基本架構電路上，嘗試以單相電壓模式、峰值電流模式等不同控制。在模擬中，探討當差頻發生時，在不同控制模式下，輸出電壓及電感電流的變化。且在雙相直流降壓轉換器應用電路模擬中，探討當差頻發生時，為何各相電感電流變化幅度遠大於輸出電壓，及為何雙相與單相直流降壓轉換器的結果會不同。
在本文中，也藉由Simplis模擬軟體中所提供之雙相直流降壓轉換器應用電路，經由模擬之波形來解釋在不同的差頻負載下，輸出電壓及電感電流波形之相對應的變化，了解影響輸出電感電流變化之最大因素。在最後，會探討幾種可能的解決方案及其改善效果。同時，也針對目前之結果，提出建議方案及未來研究之目標。

In this thesis, the effect of beat frequency on DC-DC buck converters is discussed by using Simplis simulation software. This study covers the effect of the beat frequency on the single-phase voltage mode and peak current mode and the two-phase dual-loop control mode. The advantages and disadvantages of these two control modes and how these two control modes deal with the loading with beat frequency are also covered.
In the simulation, the behaviors of output voltage and current under beat frequency is discussed. In the simulation with the two-phase the DC buck converter, why the amplitude of the inductor current is much bigger than the output voltage’s under beat frequency is discussed. The discussion also explains why the behaviors under beat frequency condition are different among the voltage mode、peak current mode single phase buck converters and two phase dual-loop buck converters.
In the end of this thesis, some solutions are discussed. The proposed solution and the future research objectives are also disclosed.

摘要 i
Abstract ii
誌謝 iii
目錄 iv
圖索引 vi
表索引 ix
第一章 緒論 1
1.1 研究背景 1
1.2 研究動機及目的 1
1.3 內容編排方式 2
第二章 差頻對電壓模式的影響分析 4
2.1 差頻發生之原因 4
2.2 電壓模式降壓轉換器 6
2.3 電壓模式之迴路增益 9
2.4 單相電壓模式降壓轉換器多頻模型 15
2.5 單相電壓模式降壓轉換器Simplis電路 23
2.5.1 開關切換頻率為 600 kHz時之波德圖 25
2.5.2 負載為1.2 V/ 21 A時之電感電流 25
2.5.3 不同差頻下之電感電流比較 26
第三章 差頻對峰值電流模式之影響分析 29
3.1 峰值電流模式降壓轉換器 29
3.2 電流模式之迴路增益 33
3.3 單相峰值電流模式降壓轉換器多頻模型 37
3.4 峰值電流模式降壓轉換器電路 39
3.4.1 不同負載下之波德圖比較 40
3.4.2 負載為1.2V/21A時之電感電流 41
3.4.3 不同差頻下之電感電流比較 42
第四章 差頻對雙相式降壓轉換器的影響 46
4.1 多相降壓轉換器 46
4.1.1 峰值電流模式雙相式轉換器電路 47
4.1.2 輸出電壓頻率 48
4.1.3 平均電流模式 49
4.1.4 多頻雙相式轉換器電路模型轉移函數 50
4.2 ISL6313電壓模式雙相降壓轉換器電路 55
4.2.1 PWM與電感電流波形 56
4.2.2 不同負載下之波德圖 57
4.2.3 不同差頻下之電感電流比較 58
4.2.4 補償器頻寬與差頻電感電流關係 61
第五章 差頻問題解決方向 63
5.1 增加電流迴路的頻寬 64
5.2 改變開關切換頻率 65
5.3 使用定值導通模式(變頻)控制器 66
5.4 帶拒濾波器(Notch Filter) 66
5.5 定頻控制器的綜合解決方案 67
第六章 結論與未來研究方向 71
6.1 結論 71
6.2 未來研究方向 72
參考文獻 74

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