本文針對應用於不斷電系統的輸出換流器，為了提高其功率密度，提出了一種柔性切換的單相脈寬調變換流器電路架構，詳細的說明了此電路的工作原理，並對此柔性切換單相脈寬調變換流器，做了完整分析、模擬與實驗。本文針對雙極性脈寬調變全橋架構之換流器，進行了電路分析與開關損失分析，經由比較不同的柔性切換方法後，選擇箝位模式共振極點柔性切換方法。本論文同時完成了一個可切換於輸出功率為1 kW、輸出電壓為AC 110 V、切換頻率為100 kHz之柔性切換單相脈寬調變換流器，實驗結果顯示所完成的原型電路在額定功率輸出下，整體效率較硬性切換可提高4%。

To increase the power density of the PWM inverter of modern uninterruptible power supplies (UPS), one approach is to increase the switching frequency, however, additional switching losses are usually accompanied with the increasing switching frequency. This thesis applies soft-switching technique in reducing switching losses of PWM inverters used for medium power UPS. The operational principle and switching loss analysis of the H-bridge inverter using bipolar PWM modulation technique have been studied in detail. After evaluation of various soft-switching techniques, a clamped-mode resonant pole inverter (CMRPI) soft-switching technique was adopted in realization of the PWM inverter circuit. Detailed circuit analysis and computer simulation of the developed soft-switching PWM inverter were given. We have constructed a soft-switching PWM inverter with switching frequency of 100 kHz. The rated output power of this prototype PWM inverter is 1kW, its DC bus voltage is 180 V, and its output ac voltage is 110 V. Experimental results show that the constructed soft-switching PWM inverter can reach an efficiency improvement of 4% at rated output.

中文摘要i
英文摘要ii
誌謝iii
目錄iv
表列vii
圖列viii
第一章緒論1
1.1研究背景及發展概況1
1.2研究動機及目的3
1.3系統描述4
1.4論文架構5
第二章橋式架構換流器的分析7
2.1雙極性脈寬調變換流器的分析7
2.1.1推導輸出電壓漣波 9
2.1.2推導電感電流漣波10
2.2輸出濾波器L、C值之設計法則12
2.2.1推導最大電感電流漣波計算公式12
2.2.2推導最大輸出電壓漣波計算公式13
2.2.3直流鏈電壓之選擇14
2.2.4諧振頻率(resonant frequency)之決定14
2.2.5L、C值之決定16
2.3空白時間的考慮17
2.4硬性切換在一次切換周期內各開關動作的分析19
2.4.1電流不連續模式19
2.4.2電流連續模式25
2.4.3討論30
2.5切換損失的估計30
2.5.1切換損失30
2.5.2導通損失33
2.5.3計算實例34
第三章硬性切換與柔性切換技術36
3.1硬性切換與柔性切換簡介36
3.2各種柔性切換換流器41
3.2.1負載共振柔性切換42
3.2.2直流鏈電壓共振柔性切換42
3.2.3共振轉移柔性切換42
3.2.4選擇電路架構47
3.3箝位模式共振極點柔性切換47
3.3.1基本運作原理分析48
3.3.2ZVS導通的條件55
3.3.3設計步驟57
第四章硬體實現62
4.1主要電路62
4.1.1雙極性脈寬調變產生電路62
4.1.2空白時間產生電路63
4.1.3閘極驅動電路64
4.2保護電路65
4.2.1短路保護65
4.2.2過載保護66
4.2.3過溫保護66
4.3主要元件的選擇與設計67
4.3.1主開關67
4.3.2輔助二極體68
4.3.3電感器68
4.3.4線材的選擇70
第五章模擬及實驗結果71
5.1模擬系統73
5.2實驗環境73
5.3模擬及實驗結果74
5.3.1切換頻率100kHz與20kHz下輸出電壓漣波比較74
5.3.2柔性切換下各時段各元件之模擬與實驗波形77
5.3.3加入所提柔性切換後並不影響輸出電壓81
5.3.4柔性切換共振元件狀態圖81
5.3.5柔性切換下主開關之電壓電流與切換軌跡圖81
5.4效率比較86
第六章結論89
參考文獻91
作者簡介94

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