臺灣博碩士論文加值系統

隨著科技的進步，電腦的快速發展，電源供應器所需提供之高功率品質的需求越來越高，為了滿足這些需求，如何設計一台適用於PWM輸入端之具高功率因數修正切換式電源供應器，可以獲得較高功率因數以提供最佳之用電品質，便成為一項值得研究的課題。因此，提高功率因數、改善交流輸入電源即是本論文之研究重點。
為了使系統達到理想的穩壓控制並且提高系統的功率因數，本論文使用ML4812為控制IC，主要電路為升壓型電路架構，採用控制方式為峰值電流控制法則，並利用霍爾電流感測器取代傳統電流變壓器，以達成簡化電路體積與節省成本之目的。其輸入為一般市電及輸出穩定直流電壓180V。實驗結果驗證所提出之系統的確可獲得高功率因數與穩定之直流輸出電壓。

Along with the advanced technology, the rapid development of the computer, the requirement of the high power quality that is provided by power supply is higher and higher. For satisfying these need, it is worth studying issue that how to design a switching power supply with high power factor furnishing the best electricity quality. Therefore, the exaltation of power factor and improvement of the input source of electricity is the research point of this thesis.
In this thesis, a FAIRCHILD SEMICONDUCTOR power factor controller ML4812 is used to implement the peak current control method of the system based on boost converter for the purpose of achieving the stable voltage and high power factor of the system. Furthermore, the Hall current sensor is replaced the current transformer in order to reduce the circuit volume and cost. The input is the utility power, and the stable output of the DC voltage is 180V. The experimental results justify the performance of the power factor correction in high power applications.

ABSTRACT (IN CHINESE) Ⅰ
ABSTRACT (IN ENGLISH) Ⅱ
ACKNOWLEDGMENT (IN CHINESE) Ⅲ
CONTENTS Ⅳ
LIST OF FIGURES Ⅵ
LIST OF TABLES Ⅷ
CHAPTER 1 INTRODUCTION 1
CHAPTER 2 BASIC CONCEPTS OF POWER FACTOR CORRECTION 5
2.1 Definition of the Power Factor 5
2.2 Types of Converter for PFC and its Development 9
2.2.1 Buck converter 9
2.2.2 Boost converter 11
2.2.3 Buck-Boost converter 15
2.3 The Control Method of the Boost PFC 17
2.3.1 Average current control 17
2.3.2 Hysteresis current control 19
2.3.3 Peak current control 20
2.4 The Principle of the Active Boost PFC 22
CHAPTER 3 HARDWARE STRUCTURES AND DESIGN 25
3.1 The Overview of the Power Factor Correction Controller 26
3.2 System Configurations 28
3.2.1 Bridge rectifier 29
3.2.2 Boost circuit 30
3.2.3 Output capacitor 32
3.2.4 Input/Output isolation 32
3.2.5 The description of the controller and its application 33
3.3 Hardware Design 35
CHAPTER 4 EXPERIMENTAL RESULTS 40
4.1 Experimental Results of the Proposed Circuit 40
4.2 Comparison of the Different Control Method 48
CHAPTER 5 CONCLUSION 55
REFERENCES 56

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