本論文根據部分功率能量調節之觀念設計電源轉換電路，僅轉換少部分功率，調節電源轉換電路之輸出電壓或電流。部分功率調節器所處理的功率可串聯或並聯於主輸入電源以共同供應負載。串聯型部分功率調節器為電壓調節型之電力轉換器，輸出電壓的極性可與主輸入電源相同或相反極性，以提高或降低電力轉換器輸出端之電壓。另一方面，電流調節型之電源轉換電路係由並聯型部分功率調節器汲取或匯出電流以調節輸出電流。具部分功率調節之電源轉換電路，因大部分之負載功率直接由輸入電源供應，僅轉換少部分功率以調節負載之電壓或電流，可有效提升整體電能轉換效率。
本文提出兩種具串聯型部分功率調節之LED照明驅動電路，採用返馳式轉換器分別實現昇壓與降壓功能。其中，三原色LED組成之白光LED燈驅動電路採用多輸出返馳式轉換器，包含三組昇壓型部分功率調節器，以多相脈衝寬度調變控制，個別調節三原色LED串列電流。降壓型可調光之LED照明驅動電路則採用具部分功率調節之降壓型電力轉換器，可用單一主動開關，搭配雙頻脈衝寬度調變，線性或脈寬調節LED之電流。
並聯型部分功率調節器可應用於串聯太陽能板發電系統，執行分散式架構最大功率追蹤。系統可設定直接輸出之太陽能板串聯電流，再由每片太陽能板配置之雙向返馳式轉換器，汲取或匯入太陽能板之電流，使所有太陽能板於遮陰狀況不同時，皆操作在最大功率點，並使電能轉換損耗最小。因此，串聯型太陽能板系統可輸出最大的功率，達到太陽能發電之最大利用率。
本研究經實驗結果證實，具部分功率調節之電源轉換電路的電能轉換效率高於傳統架構之電源轉換器。此外，電源轉換電路具有較小的電壓電流應力，使產品可達到體積小、重量輕和低成本的需求。

Based on the concept of partial power regulation, power source conversion circuits can be designed to process a fractional power to outputs for voltage or current adaptation. The partial power regulator (PPR) for processing a part of the supplied power can be connected in series or in parallel with the main power source. A series-connected PPR serves as a voltage regulator, which can be either the same or reverse polarity with the main voltage source to provide a step-up or step-down voltage at output terminal. On the other hand, a current regulator as the parallel-connected PPR can add or detract a current to adapt a higher or lower current. A power source conversion circuit with a PPR for processing only a small part of the input power, delivers the most power directly to the load, and thus can have a high overall power conversion efficiency.
Two power source conversion circuits with series-connected PPRs are derived for driving LED lamps. Both step-up and step-down voltage regulations are realized by flyback converters. A driver circuit with three PPRs is designed for a white light lamp with three red-green-blue (RGB) LED strings. By multi-phase pulse-width modulation (PWM), LED currents can be controlled precisely and independently. Another LED driver with a series-connected PPR for step-down voltage regulation is accomplished by single active power switch with double-frequency PWM.
In a solar power system, a circuit structure with the parallel-connected PPRs is implemented for utilizing the maximum power from the photovoltaic (PV) panels connected in series. By operating all PV panels at their maximum power points (MPPs) even under partial shaded conditions with unequally illumination, the attached bi-directional flyback converters add a current into or detract a current from the generated MPP currents forming an identical series current. By delicately selecting an adequate series current, the power conversion losses can be minimized. As a result, the maximum generated power from series PV panels can be obtained.
The experimental results carried out on laboratory circuits have demonstrated that the overall power conversion efficiencies of the power source conversion circuits with PPRs are much higher than those of the conventional ones. In addition, the power source conversion circuits with PPRs are advantageous of smaller voltage and current stresses on circuit components, leading to products of smaller size, lighter weight and lower cost.

中文審定書 i
英文審定書 ii
誌謝 iii
摘要 iv
Abstract vi
Table of Contents viii
List of Figures xi
List of Tables xv
Chapter 1 Introduction 1
1-1 Background 1
1-2 Literature Review 3
1-3 Research Objectives and Dissertation Organizations 8
Chapter 2 Partial Power Regulation 10
2-1 Concept of Partial Power Regulation 10
2-2 Series-Connected Partial Power Regulator 12
2-3 Parallel-Connected Partial Power Regulator 13
2-4 Applications of Power Source Conversion Circuits with PPRs 14
Chapter 3 Step-Up LED Driver with Series-Connected PPR 16
3-1 Circuit Configuration 16
3-2 Circuit Structure 18
3-3 Circuit Operation 19
3-4 Power Efficiency Estimation 22
3-5 Circuit Analysis 24
3-6 Ripple-Frequency Model 27
3-7 Design Criterion 33
3-8 Dimming Control Scheme 34
3-9 Experimental Verification I:
A Step-Up Dimmable LED Driver 36
3-10 Experimental Verification II:
A Driving Circuit for RGB White-Light LED Lamp 42
Chapter 4 Step-Down LED Driver with Series-Connected PPR 55
4-1 Circuit Configuration 55
4-2 Circuit Structure 57
4-3 Circuit Operation 58
4-4 Power Efficiency Estimation 61
4-5 Circuit Analysis 62
4-6 Experimental Verification:
A Step-Down Dimmable LED Driver 64
Chapter 5 MPPT for PV System with Parallel-Connected PPRs 73
5-1 Partial Power Regulators for Maximum Power Point Tracking 73
5-2 Circuit Structure 73
5-3 Circuit Operation 75
5-4 Power Utilization Optimization of PV System 79
5-5 Experimental Verification:
The MPPT with Parallel-Connected PPRs in PV System 83
Chapter 6 Conclusions and Future Perspective 93
REFERENCES 97
PUBLICATIONS 104

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