臺灣博碩士論文加值系統

在本文中，我們提出了應用多目標最佳化演算法法與田口方法針對DC-DC轉換器之RCD緩衝器進行最佳化設計。首先利用多目標演算法得到了RCD緩衝電路之理想參數值，再藉由田口方法進行最佳化實際電路設計。RCD緩衝電路經常應用於返馳式轉換器中為了消除由變壓器之漏電感所造成的峰值電壓，而在針對RCD緩衝電路進行設計時通常需要考慮此兩個目標 (1)減少電源開關上的峰值電壓(2)降低RCD緩衝電路上的損失。但是經由詳細分析過後可以知道這兩目標之間是互相衝突且矛盾的，因此我們使用了三個多目標演算Non-dominated sort genetic algorithm-II (NSGA-II)、Multi-objective particle swarm optimization (MOPSO)、 Multi-objective differential evolution (MODE)解決了目標與目標間互相衝突的問題並且將三個演算法進行性能比較並挑選出性能最好之pareto-optimal solutions解集合中選取折衷的參數實現電路進行驗證。最後也將經過最佳化設計過的電路與未經過最佳化設計的電路進行比較其最佳化設計效果。

In this paper, we propose that Multi-objective algorithm and the Taguchi method be employed in the optimal design of a DC-DC converter with an RCD snubber. The RCD snubber is usually used in flyback converter to limit the voltage spikes which are caused by leakage inductance of the transformer. The design considerations of RCD snubber are commonly two objectives: (1) minimize power loss in the snubber ; (2) minimize the voltage spikes across the transistor. But the RCD design consideration for voltage spikes suppression is usually in contradiction with power loss. So we implement the circuit by using optimal trade-off parameters, which results from comparison of pareto solution set of Multi-objective Differential Evolution (MODE), Non-Dominated sort genetic algorithm-II (NSGA-II) and Multi-objective particle swarm optimization (MOPSO) methods. Finally, the comparison of the spike voltage and power loss showed the advantages of the optimal circuit design over a non-optimal design .

摘要 i
Abstract ii
致謝 iii
目錄 iv
表目錄 vi
圖目錄 vii
第 一 章 緒論 1
1.1前言 1
1.2研究動機及文獻回顧 1
1.3論文架構 5
第 二 章 返馳式轉換器原理 6
2.1轉換器工作模式 7
2.1.1連續導通模式(Continuous-Conduction Mode, CCM) 8
2.1.2 不連續導通模式(Discontinuous-Conduction Mode, DCM) 8
2.2硬性與軟性切換技術 10
2.2.1硬性切換 10
2.2.2軟性切換 11
2.3電路工作原理 11
2.3.1基本型返馳式轉換器 11
2.3.2返馳式轉換器+RCD緩衝器 14
2.4電路推導與分析 15
2.4.1功率開關之峰值電壓 15
2.4.2 RCD緩衝器電路損失 19
第 三 章 最佳化方法理論與分析 21
3.1最佳化方法簡述 21
3.2單目標最佳化演算法 23
3.2.1遺傳基因演算法 23
3.2.2粒子群演算法 30
3.2.3微分進化演算法 34
3.3多目標最佳化演算法 39
3.3.1基於精英策略之非支配排序遺傳演算法 39
3.3.2多目標粒子群演算法 43
3.3.3多目標微分進化演算法 48
3.4田口方法 51
3.4.1直交表 52
3.4.2實驗配置與結果分析 53
第 四 章 返馳式轉換器之最佳化設計結果與分析 59
4.1返馳式轉換器之變壓器設計 59
4.1.1估算臨界電流(決定DCM/CCM 邊界) 60
4.1.2計算工作週期D 及計算匝數比n： 60
4.1.3計算CCM / DCM臨界狀態之二次側峰值電流： 60
4.1.4計算一、二次側電感 61
4.1.5計算一、二次側電感之峰值電流 61
4.1.6計算變壓器一、二次側之匝數： 62
4.2脈衝寬度調變控制電路 63
4.3返馳式轉換器之RCD緩衝電路最佳化設計 65
4.3.1選擇目標 66
4.3.2選擇設計參數 67
4.3.3演算法參數設定 69
4.3.4 Non-dominated Solution set 69
4.3.5演算法性能評估 73
4.3.6選擇折衷參數 81
4.3.7控制因子與水準數 82
4.3.8建立直交表 83
4.3.9回應表(圖) 84
4.3.10確認實驗 86
第 五 章 結論 90
5.1總結 90
5.2未來建議 91
參考文獻 92

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