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研究生:鐘志偉
研究生(外文):Chih-Wei Chung
論文名稱:具適應性過電流保護機制之多階D類音頻放大器
論文名稱(外文):Adaptive Overcurrent Protection Scheme for Multilevel Class D Audio Amplifier
指導教授:林俊偉林俊偉引用關係
指導教授(外文):Chun-Wei Lin
學位類別:碩士
校院名稱:國立雲林科技大學
系所名稱:電子與資訊工程研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2009
畢業學年度:97
語文別:中文
論文頁數:48
中文關鍵詞:D類音頻放大器脈波寬度調變過電流
外文關鍵詞:overcurrentclass DPWM
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本論文針對多階D類音頻放大器提出ㄧ適應性過電流保護機制,且此保護機制可使音頻放大器不致產生音頻缺陷(audio hole)的問題。其核心概念為偵測輸出級電流量並迴授可調整責任週期比率(duty ratio) 之控制訊號,以改變調變輸出訊號密度,由於調變輸出訊號密度的降低,使得多階運算所得之結果及輸出轉換器之輸出電壓位階值均依據此責任週期比率降低,因而達到利用調整輸出電壓值的方式衰減因過電流所增加的電流值,所以輸出最大功率恆維持在限定範圍內。本文提出之方法,經分析模擬後證明,不僅有效地解決音頻放大器的過電流問題,且不同於傳統直接將功率電晶體關掉的保護方式,故不會造成音頻缺陷的問題。
In this thesis, we propose an adaptive protecting scheme against the overcurrent of multilevel output class-D audio amplifier, which enable audio amplifier to prevent from causing the problem of audio holes. The core concept is to change the output signal density of pulse-width modulation (PWM) by detecting the current amount of the output stage and then feedbacking the controlling signal with adjustable duty cycle. Due to the decrease of the pulse density of the pulse-width mudulation, it makes that both the resulting value of the time-division-adder (TDA) and the output voltage level of the dual H-bridge multilevel converter decrease according to the duty ratio. In this way, we reach to that decreasing the additional current caused by overcurrent by adjusting the output voltage so as to keep the maximum power in the limited range all the time. By analyzing and simulating, it proofs that the proposed methodology not only effectively solves the overcurrent problem of audio amplifier, but also is different from the conventional ones protecting circuit by means of switching off power transistors directly. So there is not any problem of audio holes.
中文摘要 …...…………………..…………………………………………………………………………………… i
英文摘要 …………….............................…………………………………………………………………………… ii
誌謝 …………….............................…………………………………………………………………………… iii
目錄 ……………………..………...…………………………………………………………………………… iv
表目錄 ………………...…………………..……………………………………………………………………… v
圖目錄 …………….............................…………………………………………………………………………… vi
第一章 緒論......................................................................................................................................................... 1
1.1 研究背景............................................................................................................................................. 1
1.2 研究動機............................................................................................................................................. 2
1.3 論文架構............................................................................................................................................. 3
第二章 D類音頻放大器........................................................................................................................... 4
2.1 前言......................................................................................................................................................... 4
2.2 音頻放大器之分類及效能比較...................................................................................... 5
2.3 傳統D類音頻放大器............................................................................................................. 6
2.4 多階D類音頻放大器............................................................................................................. 7
第三章 適應性過電流保護機制設計原理................................................................................. 9
3.1 適應性過電流保護機制之理論分析與證明......................................................... 9
3.2 適應性過電流保護機制電路設計................................................................................ 16
第四章 硬體電路實現................................................................................................................................. 18
4.1 各個區塊之電路實現.............................................................................................................. 18
4.1.1 可調的脈波寬度產生器.............................................................................................. 18
4.1.2 多階D類音頻放大器…............................................................................................... 25
4.2 模擬結果............................................................................................................................................ 32
第五章 結論......................................................................................................................................................... 38
參考文獻 ……............................................................................................................................................................. 39
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[2]S. Burrow and D. Grant, “Efficiency of low power audio amplifiers and loudspeakers,” IEEE Trans. On Consumer Electronics, Vol. 47, No. 3, pp. 622-630, August 2001.
[3]S. C. Li, V. C.-C. Lin, K. Nandhasri, and J. Ngarmnil, “New high-efficiency 2.5V/0.45W RWDM class D audio amplifier for portable consumer electronics,” IEEE Trans. On Circuit and Systems I, Vol. 52, No. 9, pp. 1767-1774, September 2005.
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[5]M. Berkhout, ”An integrated 200-W Class-D audio amplifier,”Proc. IEEE J. Solid-State Circuits, Vol. 38, pp. 1198-1206, July 2003.
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[7]M. Berkhout, “Integrated overcurrent protection system for class-D audio power amplifiers,” IEEE Journal of Solid-State Circuits, Vol. 40, No. 11, pp. 2237-2245,
Nov. 2005.
[8]E. Gaalaas, “Class D audio amplifiers: what, why, and how,” Analog Dialogue, vol. 40, June 2003, Analog Devices.
[9]M. Bloechl, M. Bataineh, D. Harrell, “Class D Switching Power Amplifiers: Theory, Design, and Performance,” Proc. IEEE Southeast Conf., pp. 123-146, March 2004.
[10]M. Score, “Reducing the output filter of a Class-D amplifier,” Analog Applications Journal, pp. 19-23, August 1999, Texas Instruments.
[11]V. M. E. Antunes, V. F. Pires, and J. F. A. Silva, “Narrow pulse elimination PWM for multilevel digital audio power amplifiers using two cascaded H-Bridges as a nine-level converter,” IEEE Trans. On Power Electronics, Vol. 22, No. 2, pp. 425-434, March 2007.
[12]P. Muggler, W. Chen, C. Jones, P. Dagli, and N. Yazdi, “A filter free class D audio amplifier with 86% power efficiency,” in Proc. Int. Symp. Circuits and Systems, Vol.1, pp. I-1036-1039, May 2004.
[13]H.-S. Kim, S.-W. Jung, H.-M. Jung, J.-K. Shin, and P.-C. Choi, “Low cost implementation of filterless class D audio amplifier with,” IEEE Trans. On Consumer Electronics, Vol. 52, No. 4, pp. 1442-1446, November 2006.
[14]A. R. Oliva, S. S. Ang, and T. V. Vo, “A multi-loop voltage-feedback filterless Class-D switching audio amplifier using unipolar pulse-width-modulation,” IEEE Trans. On Consumer Electronics, Vol. 50, No. 1, pp. 312-319, February 2004.
[15]Chun-Wei Lin, Bing-Shiun Hsieh, Yu-Cheng Lin, “Enhanced Design of Filterless Class-D Audio Amplifier,” Proc. IEEE Design Automation and Test of Europe, pp. 1397-1402, April 2009.
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