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博碩士論文 etd-1001117-221431 詳細資訊
Title page for etd-1001117-221431
論文名稱
Title
諧振電感對半橋LLC串聯諧振轉換器之 轉換效率影響分析
Conversion Efficiency Analysis for the Effect of Resonant Inductance in a Half-bridge LLC Series Resonant Converter
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
128
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2017-10-20
繳交日期
Date of Submission
2017-11-01
關鍵字
Keywords
LLC串聯諧振轉換器、諧振電感、操作頻率、導通損失、轉換效率
LLC Series Resonant Converter, Resonant Indutance, Operating Frequency, Conversion Efficiency, Conduction Loss
統計
Statistics
本論文已被瀏覽 5909 次,被下載 55
The thesis/dissertation has been browsed 5909 times, has been downloaded 55 times.
中文摘要
LLC串聯諧振轉換器在固定變壓器激磁電感下,諧振槽中不同的諧振電感會對應不同的諧振頻率、諧振電感比值及頻率響應增益趨勢,進而影響導通損失與轉換效率。故若能分析諧振電感對應之頻率及其與導通損失間的關係,對於LLC串聯諧振轉換器轉換效率提升將有助益。本論文分析不同諧振電感對LLC串聯諧振轉換器之轉換效率影響,整理三種不同損失估計公式,探討不同負載與操作頻率下,諧振電感電流大小與變壓器二次側元件電流大小,對導通損失之影響。由分析結果可以看出,LLC串聯諧振轉換器於不同負載下,透過諧振電感的選定,可得到較佳之轉換效率。論文中設計並研製一輸入直流380V,輸出直流48V,且額定輸出功率1200W的LLC串聯諧振轉換器,然後以多組諧振電感進行實測,並由導通損失公式估計其導通損失,驗證推導及實測效率趨勢。實驗結果顯示,透過選擇不同之諧振電感,於輕載最多可提升8.2%的轉換效率,而於重載時最多可提高1.43%之轉換效率。
Abstract
Under the fixed transformer excitated inductance of LLC series resonant converter, different resonant inductances in the resonant tank result in different resonant frequencies, resonant inductance ratios and trends of frequency response gain;therefore,the conduction loss and conversion efficiency will be affected. It is helpful to analyze the frequency of the resonant inductance and its relationship with the conduction loss to further improve the conversion efficiency of LLC series resonant converters. The influence of different resonant inductances on the conversion efficiencies of the LLC series resonant converter is analyzed in this thesis. Three different loss estimation formulas investigate the effects of the currents of resonant inductances and secondary side of the transformer on the conduction loss under different resonant inductances are discussed. It can be observed from the analysis results, through the selection of resonant inductor, LLC series resonant converter can obtain better conversion efficiency under different loads. A LLC series resonant converter with a rated input voltage of 380V DC, a rate output voltage of 48V DC and a rated output power of 1200W is designed and implemented in this thesis. Several resonant inductances are used in the implemented converter to measure the conversion efficiencies under different loads and then compared with the loss estimation formulas to verifiy the effect of resonant inductances. Experimental results show that by selecting an appropriate resonant inductance the maximum conversion efficiency improvement of 8% and 1.43% for light load and heavy load can be achieved, respectively.
目次 Table of Contents
目錄
論文審定書 i
誌謝 ii
摘要 iii
Abstract iv
目錄 v
圖目錄 viii
表目錄 xii
第一章 緒論 1
1-1研究背景 1
1-2研究動機 2
1-3論文大綱 4
第二章 諧振轉換器的特性分析簡介 5
2-1 理想RLC串聯諧振電路 5
2-1.1串聯諧振轉換器 7
2-1.2 並聯諧振轉換器 9
2-1.3 串並聯諧振轉換器 11
2-2 LLC轉換器簡介 13
2-3 LLC轉換器動作模式分析 20
2-3.1 LLC 工作區域Region 1 分析 20
2-3.2 LLC 工作區域Region 2 分析 29
2-4 LLC轉換器於相異諧振電感影響 38
2-5諧振式轉換器與LLC轉換器比較 40
第三章 LLC轉換器損失分析 42
3-1電流有效値與導通損推導 43
3-1.1電流有效値與導通損推導方法A 44
3-1.2電流有效値與導通損推導方法B 47
3-1.3電流有效値與導通損推導方法C 51
3-2 開關驅動與本體二極體損失推導 56
3-3 LLC轉換器切換損失推導 56
第四章 電路設計與控制 59
4-1電路元件設計考量 59
4-1.1功率開關元件選擇 60
4-1.2設計變壓器圈數比 60
4-1.3變壓器設計考量 61
4-1.4功率開關零電壓導通條件 63
4-1.5直流增益探討 64
4-1.6諧振槽設計考量 66
4-1.7二次側整流二極體選擇 67
4-1.8輸出電容設計 68
4-2控制晶片與PI控制 69
第五章 實驗及分析結果 72
5-1 LLC轉換器電路測試規格 72
5-2實際際波形量測 73
5-2.1實際諧振頻率量測 73
5-2.2諧振電感值148μH實際量測 76
5-2.3諧振電感值97μH實際量測 81
5-2.4諧振電感值47μH實際量測 85
5-2.5諧振電感值25μH實際量測 90
5-3效率估測與實測比較 96
5-3.1方法A效率估測 96
5-3.2方法B效率估測 97
5-3.3方法C效率估測 98
5-3.4實測效率與諧振電感選擇 100
第六章 結論與未來展望 112
6-1結論 112
6-2未來展望 113
參考文獻 114
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