數位控制應用於半橋式轉換器｜國立臺灣科技大學博碩士論文系統

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研究生：	許文政 Wun-Jheng Hsu
論文名稱：	數位控制應用於半橋式轉換器 Digital Control Application in Half-Bridge Converter
指導教授：	呂錦山 Ching-Shan Leu
口試委員:	邱煌仁 Huang-Jen Chiu 榮世良 Brady Jung 林瑞禮 Ray-Lee Lin 黃仲欽 Jong-Chin Hwang
學位類別：	碩士 Master
系所名稱：	電資學院 - 電機工程系 Department of Electrical Engineering
論文出版年：	2012
畢業學年度：	100
語文別：	英文
論文頁數：	71
中文關鍵詞：	類比控制、數位控制、Taiwan Tech 半橋式轉換器
外文關鍵詞：	Analog control, digital control, Taiwan Tech Half-Bridge Converter
相關次數：	點閱：469 下載：12
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以40V到75V輸入電壓，48V輸出電壓的電池備用電源的通信系統電能轉換應用，除了需要可昇壓可降壓的電壓增益，為延長電池壽命需要連續的輸入電流。在可利用的轉換器技術之中，Buck-Boost衍生的轉換器雖然可以提供所需的電壓增益。然而輸入電流是非連續的，產生di/dt的雜訊。因此需要一個較大的EMI輸入濾波器。同時因轉換的小信號轉移函數有移動的極點，使得電壓模式的脈寬調變控制難以達成穩定的工作狀況。
本論文使用低輸入電流漣波半橋式轉換器，搭配一昇壓變壓器，除了可獲得可升可降的電壓增益，低輸入電流連波，並容易達成電壓模式的脈寬調變控制。然而，此一電路的控制方面尚未被探討。因此控制技術成為了本篇論文的研究主題。
在完成此一電路的類比控制設計和實現，藉由將類比控制的電路參數，利用雙線Z-轉換，獲得數位控制的差分方程式，再透過韌體的程式寫入德州儀器公司的 TMS320F28027 數位信號處理器，藉此實現數位控制。最後包括類比控制和數位控制的實驗結果將被呈現和比較。

In this thesis, a backup power converter with wide-range input voltage from 40 to 75 Vdc and output voltage 48 Vdc is required in telecommunication system application. Therefore, a step-up/step-down voltage gain and non-pulsating input current is requested. Among the available topologies, the buck-boost derived converters are suitable for this applications. However, there is a pulsating input current waveform of the Buck-Boost derived converters. The pulsating input current ripple generates di/dt noise and is not suitable for the battery based backup power system. Therefore, a larger filter is needed to meet the EMI regulation and extend the battery life. On the other hand, both derived converters have moving pole characteristic inherited from the Boost converter resulting in hard realizing the controller with PWM voltage-mode control.
Therefore, the Half-Bridge Converter with Input Current Ripple Reduction (HBC-CRR) is employed to obtain the required voltage gain, reduced input current ripple, and a controller with the simple voltage mode. Although the required voltage gain and a continuous input current can be achieved, the control of this topology has not been explored yet. It becomes the research topic of this thesis.
The analog control of HBC-CRR will be designed and implemented. Moreover, the obtained transfer function will be converted into the difference equation for the design of the digital control. Thus, digital control will be implemented by using TI TMS320F28027 Digital Signal Processors (DSPs). In addition to the theory, several main features and development tools for DSPs are introduced. Moreover, the experimental results of both analog and digital controllers for a Half-Bridge Converter with Current Ripple Reduction (HBC-CRR) power converter are presented and compared.

Abstract............................................................II
Acknowledgement.....................................................IV
Table of Contents....................................................V
List of Figures....................................................VII
List of Table.......................................................IX
Chapter 1 Introduction...............................................1
1.1 Background and Motivation........................................1
1.2 Objectives of the Thesis.........................................4
1.3 Organization of the Thesis.......................................4
Chapter 2 Half-Bridge Converter with Current Ripple Reduction........5
2.1 Introduction.....................................................5
2.2 Operation Principle..............................................7
2.3 Circuit Parameters Design.......................................10
2.4 Experimental Result of HBC-CRR..................................11
2.5 Summary.........................................................14
Chapter 3 Analog Control............................................16
3.1 Introduction....................................................16
3.2 Analog Control Design...........................................17
3.3 Experimental Results............................................26
3.3.1 Experimental Specifications and the Results...................27
3.4 Summary.........................................................29
Chapter 4 Digital control...........................................30
4.1 Introduction....................................................30
4.2 Design of the Digital Control...................................31
4.2.1 Analog-to-Digital Conversion (ADC)............................31
4.2.2 Digital PWM Module (DPWM).....................................32
4.2.3 IQ math Library...............................................33
4.2.4 Q15 Format....................................................33
4.2.5 Digital Compensator...........................................33
4.3 Hardware of the Digital Control.................................37
4.4 The Software of Digital Control.................................39
4.4.1 The Flowchart of Digital Control..............................39
4.4.2 Digital Control Sampling Scheme...............................42
4.5 Experimental Results............................................43
4.5.1 Experimental Result of the Digital Control for the HBC-CRR....43
4.6 Summary.........................................................45
Chapter 5 Conclusions and Future Research...........................47
5.1 Conclusions.....................................................47
5.2 Future Research.................................................48
Reference...........................................................49
Appendix............................................................52
Vita................................................................62

                                

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