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研究生： 黃丙坤
Huang, Bin-Kun
論文名稱： 寬範圍操作之返馳式轉換器一次側控制晶片
Primary-Side Control IC for Flyback Converter with Wide-Range Operation
指導教授： 梁從主
Liang, Tsorng-Juu
學位類別： 碩士
Master
系所名稱： 電機資訊學院 - 電機工程學系
Department of Electrical Engineering
論文出版年： 2018
畢業學年度： 106
語文別： 英文
論文頁數： 67
中文關鍵詞： 返馳式轉換器 、DCM 、CCM 、一次側控制 、寬功率範圍
外文關鍵詞： flyback converter, DCM, CCM, PSR, wide power range
相關次數： 點閱：46  下載：4 
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    • 在一次側控制返馳式轉換器電路架構當中，輸出電壓及輸出電流皆藉由輔助繞組回授資訊，能減少二次側回授元件使用，以縮小體積、降低成本，及減少回授元件所造成的能量損失。傳統的一次側控制針對非連續導通模式(DCM)提出控制方法，系統電路僅能操作在非連續導通模式，系統在高功率應用時，電流漣波較高，元件上的損耗因而提升。而操作在連續導通模式(CCM)，在相同功率下，電流漣波較小，元件損失能有效降低。目前針對一次側返馳式電源轉換器的控制方法，多數僅限於單一操作模式(DCM或CCM)。在DCM控制方法中，於電感電流零點時，偵測輔助繞組上的電壓，估算輸出電壓值，但此方法應用前提是電感電流零點，不適用於CCM。而目前CCM的相關控制方法並不適用於DCM操作，系統電路的功率操作範圍因而限制。而本文提出一控制方法適用於DCM及CCM操作，以達寬功率操作範圍。最後，本控制晶片使用TSMC 0.25 μm CMOS 高壓製程實現並將其應用於一輸入電壓400 V，輸出電壓20 V，輸出功率為150 W的一次側控制返馳式電源轉換器以驗證此控制晶片之可行性。

    For a Primary-Side Regulation (PSR) control flyback converter, output voltage can be estimated by an auxiliary winding without secondary-side feedback devices. Therefore, more compact size, lower cost, and higher efficiency can be achieved. The traditional control method mainly focuses on discontinuous conduction mode (DCM) application; nevertheless, when the system operating in high power condition, higher current ripple leads to higher losses. In contrast, when the system operating in continuous conduction mode (CCM), lower losses can be achieved because of lower current ripple. Most of current PSR control methods are implemented in either DCM or CCM. For DCM control method, the controller estimates output voltage by sensing auxiliary winding voltage at magnetizing inductor current zero points which cannot happen in CCM. Additionally, CCM control method cannot be applied to DCM, either. Because of the difficulty in sensing the output voltage, no algorithm is suitable for both DCM and CCM, and the power range of the system is limited. Finally, this controller is fabricated to achieve wide power range operation with “TSMC 0.25 μm CMOS high voltage mixed signal general purpose” process, and applied to an input voltage of 400 V, output voltage of 20 V, and output power of 150 W flyback converter to verify the feasibility of proposed control IC.

    Chapter 1 Introduction 1 1.1 Background and Motivation 1 1.2 Organization 3 Chapter 2 Fundamental Concepts of PSR Flyback Converter 4 2.1 Fundamental Concepts of PSR Flyback Converter 4 2.2 PSR Flyback Converter Control Method for DCM 8 2.3 PSR Flyback Converter Control Merhod for DCM/CCM 11 Chapter 3 Analysis and Design of the Proposed Controller 14 3.1 Theoretical Analysis of the Proposed Control 14 3.2 Overview of the Main Function Blocks 18 3.3 Introduction and Design of the Main Function Blocks 22 3.3.1 Diode Conduction Period Detector 22 3.3.2 Midpoint Trigger 24 3.3.3 Voltage Control Current Source (VCCS) 28 3.3.4 Auxiliary Circuits 30 3.4 CMOS Circuit Design 33 3.4.1 Two-Stage Op-Amp 33 3.4.2 Hysteresis Comparator 35 3.4.3 Edge Detector 39 3.4.4 Buffer 40 3.4.5 Bias Circuit 42 3.5 Chip Layout 45 Chapter 4 System Simulation and Experimental Results 46 4.1 System Simulation Results 46 4.1.1 Circuit Parameters Design 47 4.1.2 Simulation Waveforms of Main Function Blocks 47 4.2 System Simulation Performance 55 4.3 System Experimetal Results 57 Chapter 5 Conclusions and Future Works 64 5.1 Conclusions 64 5.2 Future Works 65 REFERENCES 66

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