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系統識別號 U0026-1001202019331000
論文名稱(中文) 定頻漣波模式導通時間控制降壓轉換器
論文名稱(英文) Buck Converter with Constant-Frequency Ripple-Based On-Time Control
校院名稱 成功大學
系所名稱(中) 電機工程學系
系所名稱(英) Department of Electrical Engineering
學年度 108
學期 1
出版年 108
研究生(中文) 李文中
研究生(英文) Wen-Zhong Li
學號 N26064600
學位類別 碩士
語文別 中文
論文頁數 73頁
口試委員 指導教授-張簡樂仁
口試委員-梁從主
口試委員-魏嘉玲
口試委員-白富升
中文關鍵字 適性式導通時間控制  漣波控制型降壓轉換器 
英文關鍵字 Adaptive on time control  ripple based Buck converter 
學科別分類
中文摘要 本論文實現漣波回授導通時間控制之降壓轉換器並操作於固定頻率。漣波回授方面結合電流與電壓回授,有別於傳統電流回授是對於電感電流的感測,本研究採用低通濾波器產生偽電感電流訊號,使其具相同相位之交流訊號與較不受負載電流影響之直流訊號,根據上述回授訊號可以有效降低輸出電容之等效串連電阻且降低穩態誤差。控制方面採取適性式導通時間控制,藉由可調整的導通時間以因應受電路寄生參數影響之頻率變異,使電路之系統頻率定頻。此外使用暫態加速機制改善加入電流回授後造成較慢的暫態響應。
本研究利用PCB佈局建立功率級電路與其回授電路,並以FPGA實現數位導通時間控制法,完成實際電路功能驗證。在數位控制方面亦透過CIC晶片下線進一步驗證其功能。功率級電路輸入與輸出電壓分別為4.2V及1.2V,使用具較低等效串連電阻之積層陶瓷電容實現較小的輸出電壓漣波,在穩態時仍可在不同負載狀況下使系統頻率維持定頻,並於負載變化時,使暫態時間從12μs 減少至6μs。
英文摘要 This thesis presents the ripple-based on-time control on the Buck converter for constant frequency operation. The proposed ripple-based control contains current and voltage loops. Different from the traditional current loop which detects the inductor current, the low pass filter is implemented for reflecting the pseudo inductor current, whose AC signal is in phase with the switching signal and the DC signal is not vulnerable to the variation of load current. With the proposed control loops, there is no need to use the output capacitor with high equivalent series resistance and the steady state error of the output voltage can be effectively reduced. The adaptive on-time control is also introduced to restrain the frequency variation caused by the load current with parasitic elements inside the Buck converter. Besides, the transient boosting mechanism is used to improve the slower transient response that is caused by the introduction of the current feedback loop.
In real implementation, the power stage and the peripheral circuits were built on PCB. The proposed digital constant frequency on time control was validated by both FPGA and tape-out circuit by TSMC 0.18μm manufacturing process. The input and output voltages of the power stage were 4.2V and 1.2V, respectively. The experimental result showed that the operating frequency was fixed at 1MHz in the steady state for the use of MLCC capacitor under various loading conditions. The settling time of transient response was reduced from 12μs to 6μs.
論文目次 目錄
摘要 I
Abstract II
誌謝 XIII
目錄 XIV
表目錄 XVII
圖目錄 XVIII
Chapter 1 緒論 1
1.1 研究背景與動機 1
1.2 論文架構 4
Chapter 2 漣波模式導通時間控制降壓轉換器 5
2.1 基本介紹 5
2.2 電壓回授導通時間控制降壓轉換器 6
2.2.1基本介紹 6
2.2.2穩定性問題 7
2.3 電流回授導通時間控制降壓轉換器 9
2.3.1基本介紹 9
2.3.2穩態誤差問題 10
2.4 改良型電流回授導通時間控制降壓轉換器 11
2.4.1基本介紹 11
2.4.2穩定性問題 12
2.5 本文使用的導通時間控制降壓轉換器 15
2.5.1基本介紹 15
2.5.2穩定性問題 16
2.5.3穩態誤差問題 17
Chapter 3 數位定頻導通機制 20
3.1 前言 20
3.2 相關定頻導通時間控制法 23
3.2.1負載電流修正(Load Current Correction)[20] 23
3.2.2鎖相迴路定頻[18] 23
3.2.3預測修正技術(Predicting Correction Techniques)[21] 25
3.2.4導通時間控制法比較 26
3.3 本文所提出之數位定頻導通時間控制法 27
3.3.1數位斜波產生器 29
3.3.2數位參考電壓產生器 30
3.3.3解析度與頻率 31
Chapter 4 暫態加速機制 35
4.1 前言 35
4.2 相關暫態加速機制 36
4.2.1類比最佳時間控制法[22] 36
4.2.2偽波形追蹤技術(Pseudowave Tracking Technique)[23] 37
4.3 本文所提出之暫態加速機制 39
Chapter 5 電路設計與實現 45
5.1 電路架構 45
5.2 類比電路設計與實現 47
5.2.1新輸出電壓電路 47
5.2.2暫態偵測電路 48
5.2.3快速負載變動電路 49
5.3 數位電路設計與實現 50
5.3.1數位控制架構 50
5.3.2數位定頻導通時間機制 51
5.3.3暫態加速 53
Chapter 6 量測結果 55
6.1 實體電路 55
6.1.1改良型偽電流回授 55
6.1.2定頻機制 57
6.1.3加速暫態響應機制 60
6.1.4比較分析 62
6.2 IC量測結果 63
Chapter 7 結論 68
7.1 結論 68
7.2 未來展望 69
參考文獻 70


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