一次側控制方式能夠在一次側調節輸出電流而省去光耦合電路，並為反馳式架構提供了小面積、低成本的解決方案。然而、因為實際電路中MOSFET的截止延遲，使得一次側控制返馳式轉換器在全電壓操作下的線性調節率不佳。本論文提出具輸出電流估測之一次側控制返馳式LED驅動器來改善線性調節率，並且此電流估測技術能相容於現有的LED驅動電路。所提出之返馳式LED驅動器原型已經以新唐科技0.6 μm 5V/40V CMOS製程製作出來。在全電壓操作下，此LED驅動器的最大切換頻率約在100 kHz。實驗結果證明電流估測技術可以維持LED驅動器的線性調節率於1.7 %內。

A primary-side controlled method can regulate output current on the primary side to eliminate photo-coupling circuits and then offer a small size, low cost solution for flyback topology. However, because of the turn-off delay of MOSFET in actual circuits, a primary-side controlled flyback converter experiences worse line regulation in universal-line input. This dissertation proposes a primary-side controlled flyback LED driver with output current estimation to improve line regulation, and it can be compatible with the current LED driver circuits. The prototype of proposed flyback LED driver has been fabricated in Nuvoton Technology Corporation 0.6 μm 5V/40V CMOS process. The maximum switching frequency of this LED driver is approximately 100 kHz in universal-line input. Experimental results prove that the current estimation techniques can maintain line regulation of LED drivers within 1.7 %.

中文摘要 i
ABSTRACT ii
誌　謝 iii
CONTENTS iv
List of Tables vi
List of Figures vii
Chapter 1 Introduction 1
1.1 Background and Review 1
1.2 Motivation 5
1.3 Dissertation Organization 6
Chapter 2 Primary-Side Controlled Flyback Converter 7
2.1 Single-Stage AC/DC LED Driver 7
2.1.1 LED Driver Circuit Structure 7
2.1.2 Operating Principles 10
2.2 LED Driver Performance 12
2.2.1 Line Regulation 12
2.2.2 Load Regulation 13
2.2.3 Efficiency 13
2.2.4 Power Factor 13
2.3 Constant Output Current Control Principles 14
2.4 Causes and Effects of Delayed Control 16
2.4.1 Causes of Delayed Control 17
2.4.2 Effects of Delayed Control 17
2.5 Summary 20
Chapter 3 Output Current Estimation Technique 21
3.1 Design Concept 21
3.1.1 Turn-off Delay Analysis 21
3.1.2 Peak Current Compensation 24
3.2 Compensation Strategy 25
3.2.1 Circuit Time Sequence Control 25
3.2.2 Adaptive Detection Mechanism 25
Chapter 4 Function Blocks and Implementation 29
4.1 Peak Current Compensation Circuits 30
4.2 Turn-off Delay Sample and Hold 32
4.3 Gate Driver Circuit 33
4.4 Low Dropout Regulator 34
4.5 Protection Circuits 35
4.5.1 Over Voltage Protection 35
4.5.2 Short Circuit Protection 36
4.5.3 Over Temperature Protection 36
4.6 Limiter 36
4.6.1 Maximum Operation Frequency Limit 36
4.6.2 Maximum Toff Limit 36
4.7 ZCD detector 37
4.8 Reference Generator 38
4.9 Ramp Generator 39
4.10 SIMPLIS System Simulation 39
4.11 HSPICE Simulation 42
Chapter 5 Experimental Results 45
5.1 Chip Layout and PC Board Layout 45
5.2 Chip Measurement Results 48
5.2.1 Line Regulation 49
5.2.2 Load Regulation 61
5.2.3 Efficiency and Power Factor 65
Chapter 6 Conclusion and Future Work 67
6.1 Conclusion 67
6.2 Future Work 67
REFERENCES 69
Biography and Publication List 73

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