臺灣博碩士論文加值系統

本篇論文針對操作於虛擬連續信號模式之單電感雙輸出的升降壓切換式直流對直流轉換器進行分析與模型建立。並依此分析結果以MATLAB建立自動設計平臺SIDOLA。設計者只須於圖形介面輸入轉換器需求，SIDOLA即可計算系統及電路參數，並自動模擬相互/線性/負載的調節、 暫態響應和分析轉換器的穩定性。
由於兩個輸出節點之間存在交叉干擾，對系統的穩定性存在一定的影響，使得轉換器系統回授關係變得複雜；也因此，必須特別加強穩定性分析與補償設計，由相位邊界和奈奎斯特分析去判斷補償系統和轉換器模擬結果的穩定性。我們特地利用SIDOLA 試算一個實例，藉由 SIDOLA 所計算出設計參數，並使用HSPICE以台積電 0.35um 2P4M CMOS 製程參數來實現電路。根據模擬的結果 此直流對直流轉換器的最大輸出漣波電壓在23毫伏以下，而輸出電流範圍在40mA到120mA之間。直流對直流轉換器之操作頻率為0.3百萬兆赫。在輸入電壓範圍在1.8V到2.0V之間，產生升壓及降壓的輸出電壓為 1.2V和2.4V。

In this thesis, a single-inductor-double-output (SIDO) switching DC-DC converter in operating pseudo continuous conduction mode (PCCM) is studied. The system is thoroughly analyzed and the steady-state as well as the small signal models is established. Based on the models, an automatic design platform, SIDOLA, in MATLAB is built such that according to the provided system requirements, SIDOLA can generate all the required design parameters as well as the corresponding behavioral simulations including line/load/cross regulations, transient responses and stability analyses.
Special efforts have been made for system stability analysis while there exist cross interferences between the two output nodes. Due to the cross interferences, the feedback system becomes complicated; therefore, sophisticated compensation schemes for system stability have been proposed and the results are examined by means of phase margin tests and Nyquist analyses.
Following the design parameters calculated by SIDOLA, an HSPICE model of a design example was made in the TSMC 0.35um 2P4M CMOS process. According to the simulation results, the maximum peak-to peak output voltage ripple is less than 23mV and the output current ranges are between 40mA and 120mA. The DC-DC converter operates at a frequency in 0.3 MHz and a supply voltage ranging from 1.2 to 2.4V. The buck and boost output voltage holds 1.2V and 2.4V.

摘要 i
Abstract ii
Acknowledgement iv
List of Contents v
List of Tables viii
List of Figures ix
Chapter 1 1
Introduction 1
1.1 Background 1
1.1.1 Linear Regulator 2
1.1.2 Switching Regulator 3
1.2 Multiple Output 3
1.3 Organization 5
Chapter 2 6
Fundamentals of SIDO Regulator 6
2.1 The Basic Principles of SIDO Buck-Boost Converter 6
2.1.1 Discontinuous Conduction Mode 8
2.1.2 Continuous Conduction Mode 9
2.1.3 Pseudo Continuous Conduction Mode 11
2.2 Specifications of Switching Regulator [4] 12
2.2.1 Line Regulation 12
2.2.2 Load Regulation 12
2.2.3 Output Voltage Ripple 13
2.2.4 Temperature Regulation 13
2.2.5 Cross Regulation 13
2.2.6 Transient Response 14
2.2.7 Efficiency 17
Chapter 3 20
Steady-State Converter Analysis 20
3.1 Operation Mode of the SIDO Buck-Boost Converter 20
3.1.1 Duty Cycle Relationship between Vin and Vout 21
3.2 Duty Cycle Equations of Steady-State 23
3.2.1 Constant DC-Level 26
3.2.2 Dynamic DC-Level 28
3.3 Digital Controller [7] 29
3.3.1 Digital Control Circuit 30
Chapter 4 33
Analysis and Simulation of Current Mode SIDO Buck-Boost Regulator 33
4.1 Current Mode SIDO Buck-Boost regulator [7] 33
4.1.2 Current Compensation 35
4.2 AC Equivalent Circuit 37
4.2.1 Small-Signal Equations 41
4.2.2 Analysis of SIDO Converter Transfer Function 43
4.2.3 Complete Block Diagram [8] 47
4.3 Stability in Whole System [8][9] 50
Chapter 5 61
Automatic Design System in Matlab 61
5.1 Specification of Converter 61
5.1.1 Feedback Loop Analysis and Compensator 66
5.2 Compensator Regulation 67
Chapter 6 70
Design Example and Hspice Simulation 70
6.1 Current Sensor Module for SIDO Buck-Boost Converter 70
6.1.1 Inductor Current Sensor Circuit [3] 71
6.1.2 Charge Reservation Circuit [3] 72
6.1.3 Band Gap Circuit [11] 75
6.1.4 Error Op Amp 78
6.1.5 Comparator [23] 79
6.1.6 Output Filter Design 81
6.2 System Results 83
Chapter 7 89
Conclusions and Future Work 89
7.1 Conclusions 89
7.2 Future Work 91
Bibliography 91

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