臺灣博碩士論文加值系統

本篇論文提出應用於液晶電視背光驅動之台灣科技倍壓LLC諧振式轉換器(LLC-TVD)。除了提供開關零電壓、二極體零電流以外，還有其他功能。例如,整流二極體箝位在輸出電壓，變壓器次級漏感能量回收還有輸出濾波器不需使用電感。此外，變壓器可以使用較小的匝數比、以及內建的輸出電壓漣波消除機制以至於輸出電容可以顯著減小。因此，可以用薄膜電容器代替電解電容器，從而實現長壽命的性能。
本篇論文描述在高頻操作下輸入電壓300~400V和200V/200W輸出規格的工作原理、理論分析和設計考量，並且實現了傳統倍壓(LLC-CVD)、提出的LLC-TVD 的電路實作。

LLC with Taiwan Tech voltage doubler for LCD TV backlight driver applications is proposed. The proposed converter not only has zero-voltage switching operation on the MOSFETs, but also has zero-current switching on the rectifier diodes. Moreover, it has several additional features. For instance, the rectifier diodes are clamped to the output voltage, the transformer secondary leakage energies are covered, and the output filter is used without filter inductor. Even a smaller transformer secondary-to-primary turns-ratio can be used. Furthermore, the output capacitors are significantly reduced because of Taiwan Tech voltage doubler built-in output ripple-voltage cancellation mechanism. Consequently, film capacitor can be used instead of electrolytic capacitor resulting in achieving long life performance.
In addition to the descriptions of the operation principle, theoretical analysis, and design considerations, two hardware circuits, the LLC-CVD and the LLC-TVD, with 300-400 V input and 200 V/200 W output specifications are built and tested.

III
Table of Contents
Abstract ......................................................................................................................... I
Acknowledgements ..................................................................................................... II
Table of Contents ...................................................................................................... III
List of Figures .............................................................................................................. V
List of Tables ........................................................................................................... VIII
Chapter 1 Introduction .......................................................................................... 1
1.1 Background and Motivation .............................................................. 1
1.2 Objectives of the Thesis ..................................................................... 7
1.3 Organization of the Thesis ................................................................. 7
Chapter 2 LLC with Conventional Voltage Doubler (LLC-CVD) .................... 8
2.1 Introduction ........................................................................................ 8
2.2 Operation Principle .......................................................................... 10
2.3 Circuit Analysis ................................................................................ 15
2.3.1 Equivalent Load Resistance .................................................. 15
2.3.2 Voltage Gain ........................................................................... 16
2.3.3 Output ripple voltage cancellation ....................................... 18
2.3.4 Decisions of k value ................................................................ 20
2.3.5 Decisions of Q value ............................................................... 22
2.4 Design Procedure ............................................................................. 23
2.4.1 Design of transformer ............................................................ 23
2.4.2 Design of resonant tank ......................................................... 26
2.5 Simulations Results .......................................................................... 27
2.6 Experimental Results ....................................................................... 29
2.6.1 Specification............................................................................ 29
IV
2.6.2 Experimental waveforms....................................................... 30
2.6.3 Efficiency ................................................................................ 32
2.7 Summary .......................................................................................... 33
Chapter 3 LLC with Taiwan -Tech Voltage Doubler (LLC-TVD) ................... 37
3.1 Introduction ...................................................................................... 37
3.2 Operation Principle .......................................................................... 40
3.3 Circuit Analysis ................................................................................ 46
3.4 Design Procedure ............................................................................. 48
3.4.1 Design of clamping capacitor ................................................ 48
3.4.2 Design of output capacitor .................................................... 48
3.5 Simulations Results .......................................................................... 49
3.6 Experimental Results ....................................................................... 51
3.6.1 Specification............................................................................ 51
3.6.2 Experimental waveforms....................................................... 52
3.6.3 Efficiency ................................................................................ 55
3.7 Summary .......................................................................................... 56
Chapter 4 Conclusions and Future Research .................................................... 58
4.1 Conclusions ...................................................................................... 58
4.2 Future Research ............................................................................... 59
References ................................................................................................................... 60

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