臺灣博碩士論文加值系統

本論文提出一個具耦合電感之單級非對稱半橋功因校正轉換器。此轉換器是將一個非對稱半橋轉換器與一組耦合電感及一個阻隔二極體做整合所發展而來。透過此組耦合電感及此阻隔二極體，本論文所提出之轉換器可達成具buck-boost型功率因數校正功能之單級交流直流電能轉換。因此，此轉換器可在不使用額外的功率開關及控制電路的情況下，在通用輸入電壓條件下達成趨近於一之功率因數及低總諧波失真。另外，此轉換器之兩個功率開關在通用輸入電壓條件下皆可達成零電壓切換以減少切換損失。因此，此轉換器可提升交流直流轉換器之整體效率及功率密度。故，本論文所提出之轉換器在通用輸入電壓條件下具有功率因數趨近於一、總諧波失真低、元件數量少、控制策略簡單，以及轉換效率高之特點。最後，透過電腦模擬及實作一台100W之原型電路，來驗證本論文所提出的具耦合電感之單級非對稱半橋功因校正轉換器之概念及功能。

A single-stage asymmetrical half-bridge (AHB) power factor correction (PFC) converter with coupled inductors is proposed in this thesis. The proposed converter is developed from the combination of an AHB converter and a set of coupled inductors along with a blocking diode. By applying the set of coupled inductors and the blocking diode, the proposed converter can achieve single-stage AC-DC conversion with the buck-boost type PFC. Hence, the proposed converter can provide near unity power factor (PF) and low total harmonic distortion (THD) under the universal input condition without using any extra power switch and control circuit. In addition, the proposed converter can achieve zero-voltage switching (ZVS) operation for both of the power switches under the universal input condition to reduce switching loss. As a result, the proposed converter can improve the overall conversion efficiency and power density of the AC-DC converter. Therefore, the proposed converter features the advantages of near unity PF, low THD, little component counts, simple control strategy, and high circuit efficiency under the universal input condition. Computer simulation and hardware experimental results of a 100W prototype circuit are presented to verify the effectiveness of the proposed single-stage AHB PFC converter with coupled inductors.

CONTENTS

口試委員會審定書 i
誌謝 ii
中文摘要 iii
ABSTRACT iv
CONTENTS v
LIST OF FIGURES vii
LIST OF TABLES ix
Chapter 1 Introduction 1
1.1 Research Background and Motive 1
1.2 Organization 3
Chapter 2 Review of AC-DC Converters with Power Factor Correction 4
2.1 Power Factor Correction 4
2.2 Family of AC-DC Converters 9
2.2.1 Two-Stage AC-DC Converters 9
2.2.2 Modern Single-Stage AC-DC PFC Converters 10
Chapter 3 The Proposed Single-Stage AHB PFC Converter with Coupled Inductors 12
3.1 Derivation of the Proposed Circuit Topology 12
3.1.1 Selection of the Circuit Topology 12
3.1.2 Integration of the Proposed Circuit Topology 15
3.2 Operation Modes 18
3.3 Steady State Analysis and PFC Cell DCM Boundary Condition 26
3.3.1 Steady State Analysis 26
3.3.2 PFC Cell DCM Boundary Condition 29
Chapter 4 Circuit Design and Implementation 32
4.1 Circuit Specification and Component Design 32
4.1.1 Circuit Specification 32
4.1.2 Power Stage Component Design 34
4.1.3 Control Stage Component Design 35
4.2 Control Strategy Implementation 39
Chapter 5 Simulation and Experimental Results 43
5.1 PFC Function and Output Voltage Regulation 44
5.2 ZVS Operation 46
5.3 Performance Measurement 49
Chapter 6 Conclusions and Suggested Future Works 52
6.1 Conclusions 52
6.2 Suggested Future Works 53
REFERENCE 54

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