臺灣博碩士論文加值系統

在現今社會，可攜式產品已經成為人人不可或缺的必備工具。隨著電子產品的蓬勃發展，可充電電池也成為目前最適合可攜式產品使用的行動電源。因此，如何以最理想且安全的方式將能量傳遞到電池，對電池進行最快速也最有效率的充電是一個重要的課題。在電池到充電器之間所產生寄生電阻等非理想效應會對充電器判斷輸出電壓大小造成不小的影響，進而影響充電器的效能。本文所提出之開迴路控制器是一種高效率而且低成本的充電器，同時也是一種能容忍市電的高輸入電壓隔離式充電器。但是此控制器與一般控制器最大的分別就是它並沒有直接的迴授路徑來獲取輸出電壓資訊，因此如何準確從輔助繞組中去取得輸出電壓資訊同時排除上述非理想效應所造成的影響，進而準確控制整個系統變成一個重要問題。此外，為了確保充電器在定電流充電模式與定電壓充電模式皆能保持穩定且平穩切換，本切換式充電器將定電流充電迴路與定電壓充電迴路並聯，且同時達到兩者的穩定性。
本篇論文完成一具有排除非理想效應的電池電壓精準偵測電路。不同於以往的方式，這次提出的偵測電路不僅能準確的偵測電池電壓，並不需要外部原件來做修正，同時也使所有的控制路徑在定電流充電模式與定電壓充電模式皆能保持穩定且平穩切換。為了使效率更進一步提升，波谷切換以及動態頻率切換被應用在定電壓充電模式。

Electronic devices in all kinds of fields have been requested to run after perfection in terms of every aspect in recently. Nowadays, most of household appliances and portable devices in use are directly connected to the supply via plugs and sockets to get activated or to charge its built-in battery. With the rapid growth in the consumer electronics, rechargeable mobile battery bank has proved to be the most compatible for portable devices. The proposed open-loop regulator is a high efficiency and low cost solution for power applications, and it is also a high input voltage isolated charger compatible with AC supply. However, the biggest difference between the proposed and general regulators is that the proposed has no direct feedback loop to obtain output information. Hence, it’s a major challenge to precisely detect the battery voltage from auxiliary winding, and thus to accurately control the entire system.
This proposed open-loop regulator charger excludes non-ideal effects from the practical battery. Besides, the proposed technique detects battery voltage precisely without any feedback network and has all control paths stabilized and switched smoothly under constant voltage and constant current modes. Valley switching and dynamic frequency switching are both set and applied in the constant voltage mode in order to pursue high efficiency and performance.

CHAPTER 1 1
INTRODUCTION 1
1.1 THE BASIC CONCEPT OF THE ISOLATED CONVERTER 2
1.1.1 Architecture of Asymmetrical Isolated Converters 4
1.1.2 Architecture of Symmetrical Isolated Converters 7
1.2 MOTIVATION 11
1.3 THESIS ORGANIZATION 13
CHAPTER 2 14
THE CHARGER SYSTEM WITH THE PROPOSED TRANS-PREDICTOR 14
2.1 THE NON-IDEAL EFFECT OF PRACTICAL BATTERY 15
2.2 THE PRINCIPLES OF THE PROPOSED CHARGER SYSTEM WITH TRAN-PRECDICTOR 18
2.3 THE BASIC OPERATION OF FLY-BACK BASED CONTROLLER IN CHARGER SYSTEM 19
2.3.1 The Operation of the Flyback System 21
2.3.2 The Output Current Calculation 24
2.3.3The Constant Current Loop, Constant Voltage Loop and Siwtching Frequency 25
CHAPTER 3 27
THE CIRCUIT IMPLEMENTATIONS 27
3.1 THE TRANS-PREDICTOR 27
3.2 THE CURRENT TRANS-RUNNER 30
3.2 THE LOOP SELECTOR 32
3.3 PROTECTION MECHANISMS 33
3.4 THE POWER COMPENSATINO 34
CHAPTER 4 36
SYSTEM STABILITY ANALYSIS 36
CHAPTER 5 43
EXPERIMENTAL RESULTS 43
5.1 DESIGN SPECIFICATIONS, CHIP MICROGRAPH AND PCB PROTOTYPE 43
5.2 EXPERIMENTAL RESULTS 46
CHAPTER 6 52
CONCLUSIONS AND FUTURE WORK 52
6.1 CONCLUSIONS 52
6.2 FUTURE WORKS 52
REFERENCES 53

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