臺灣博碩士論文加值系統

本論文中提出了一個單電感雙輸出直流轉直流降壓併升壓轉換器。功率級開關的切換序列有別於傳統單電感雙輸出轉換器，除了三個開關外再加上飛輪(free-wheeling)開關用以防止電感電流逆流導致轉換器整體效能下降。控制迴路方面採用漣波控制機制，因此能提高整體開關的切換頻率進而縮小被動元件的體積，對於未來電源應用在整合電路上有相當的幫助。
此晶片使用台積電0.18微米互補式金氧半製程實現。在1.2伏特的供應電源下，可提供0.95伏特的壓降電壓及1.4伏特的壓升電壓，模擬之能源轉換效率可達80%。

A Single-Inductor Dual-Output (SIDO) DC to DC Buck/Boost Converter topology is proposed. The power stage switching sequence is different from conventional type. In addition to three switches, a freewheel switch is used to prevent negative inductor current occurring and degrading the power efficiency. The converter uses ripple-based control method, which facilitates high switching frequency and decreasing the passive components volume.
The chip is fabricated in 0.18 μm CMOS, the proposed SIDO DC-DC Buck/Boost Converter can produce 0.95 V buck voltage with 1.4 V boost voltage. The power transfer efficiency could reach 80% in simulation.

Chapter 1
Introduction 1
1.1 RESEARCH MOTIVATION 1
1.2 THESIS ORGANIZATION 3

Chapter 2
Background on Single-Inductor Dual-Outputs DC-DC Converter 5
2.1 A BRIEF OVERVIEW OF SWITCHING TYPE DC-DC CONVERTER 5
2.2 BUCK CONVERTER 5
2.2.1 Overall Topology of Power Stage 5
2.2.2 CCM and DCM Operation 6
2.2.2.1 Continuous Conduction Mode 6
2.2.2.2 Discontinuous Conduction Mode 9
2.3 BOOST CONVERTER 10
2.3.1 Overall Topology of Power Stage 10
2.3.2 CCM and DCM Operation 11
2.3.2.1 Continuous Conduction Mode 12
2.3.2.2 Discontinuous Conduction Mode 15
2.4 SIDO CONVERTER 15
2.4.1 Conventional Control Schemes of a SIDO Converter [3] 16
2.4.2 Prior Arts of SIDO or SIMO Converter 17
2.4.3 General Specifications for a SIDO Converter
23
2.4.3.1 Load Regulation 23
2.4.3.2 Cross Regulation Effect 23
2.4.3.3 Conduction Loss 24
2.4.3.4 Switching Loss 24
2.4.3.5 Efficiency 25

Chapter 3 Proposed Single-Inductor Dual-Output DC-DC Converter with Ripple-Based Control Method 27
3.1 INTRODUCTION 27
3.2 PROPOSED SIDO CONVERTER ARCHITECTURE 27
3.2.1 Switch of Sequence of the Power Stage 28
3.2.2 Control Loop Architecture with Power Stage
30
3.2.3 System Simulation Results 37
3.2.4 Load Current Unbalance Condition 41
3.3 CIRCUITS DESIGN 43
3.3.1 Power MOS Design 43
3.3.2 Comparator Design 44
3.3.3 SR-Latch 46
3.3.4 Edge Detector 47
3.3.5 Comparison Table 48

Chapter 4
Measurement Results 49
4.1 PCB PRODUCTION 49
4.2 MEASUREMENT SETUP 50
4.3 MEASUREMENT RESULTS 52

Chapter 5
Conclusions and Future Work 59
5.1 CONCLUSIONS 59
5.2 FUTURE WORK 59
5.2.1 Power Switches 59
5.2.2 Feedback Loop about System Stability 59
5.2.3 Controlling Method 60

References 61

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