臺灣博碩士論文加值系統

本論文提出一個適用於多階D類音頻放大器之電源供應電路，以脈波寬度調變降壓轉換器為基礎，結合負載監測以及電壓準位調節器，發展出一個可調式切換技術。負載監測電路將持續確認多階D類音頻放大器內部的控制訊號，以判斷負載狀態為輕載或重載。電壓準位調節器則回授一個相對應的電壓準位來調節降壓轉換器當中的控制訊號之工作週期，且調整電流供應量以及功率傳遞量。在負載輕、重載切換的情況之下，所提出的可調式切換技術將可以穩定輸出電壓的變動，同時也提升了輸出音頻訊號的總諧波失真值。為了驗證理論的可行性，我們使用台積電0.35微米(μm)製程技術來實現電路。模擬結果也證實電路將提升訊號的總諧波失真達11分貝(dB)左右。

This paper presents a robust power supply circuit for multilevel converter of class-D audio amplifier. Based on pulse-width-modulation buck converter, we develop a sliding-switching technique comprises a loading monitor and a voltage level controller. The loading monitor continuously checks the internal control signal of multilevel class-D amplifier to identify whether the loading is light or heavy. The voltage level controller then feedbacks corresponding voltage level to modulate pulse width of control signal in buck converter and adjust supplying current and power delivery. The proposed sliding-switching technique stabilizes the voltage variation of power supply under the situation of alternating light and heavy loading and consequently enhances the performance of total-harmonic-distortion. To demonstrate the practicability, an integrated multilevel class-D amplifier with proposed power supply circuit is implemented under TSMC 0.35μm process. The simulation results show that the total-harmonic-distortion is improved more than 11dB without increasing power consumption of circuit.

中文摘要………………………………………………………………………………… i
英文摘要………………………………………………………………………………… ii
致謝……………………………………………………………………………………… iii
目錄……………………………………………………………………………………… iv

圖目錄…………………………………………………………………………………… v
表目錄…………………………………………………………………………………… vi
第一章 緒論........................................................... 1
1-1 研究背景....................................................... 1
1-2 研究動機....................................................... 6
1-3 相關研究....................................................... 7
1-4 論文架構....................................................... 10
第二章 放大器種類及切換式電源電路規格................................. 11
2-1 放大器的種類................................................... 11
2-2 切換式電源電路規格............................................. 15
2-3 一般型直流對直流降壓式轉換器................................... 17
第三章 可調式電源供應電路設計......................................... 24
3-1 可調式電源供應電路............................................. 24
3-2 電壓準位調節電路............................................... 27
第四章 硬體電路實現與模擬............................................. 31
4-1 控制訊號編碼電路............................................... 31
4-2 數位控制電壓準位調節電路....................................... 33
4-3 電路模擬結果………………………………………………………………… 34
4-4 電路佈局……………………………………………………………………… 38
第五章 結論…………………………………………………………………………… 40
參考文獻………………………………………………………………………………… 41

[1]Kwang Chan Lee, Chang Seok Chae, Kang Ho Lee, Gyu Hyeong Cho, “Fast switching charge dump assisted class-D audio amplifier with high fidelity and high efficiency,” Proc. IEEE Power Electronics Specialists, pp. 3506–3511, June 2008.
[2]Yu Jei Lin, Wan Rone Liou, Mei Ling Yeh, “A high efficiency filter-less class-D audio power amplifier,” Proc. IEEE ASIC, pp. 1062–1065, October 2009.
[3]Chun Wei Lin, Bing Shiun Hsieh, Yu Cheng Lin, “Enhanced design of filterless class-D audio amplifier,” Proc. IEEE Design, Automation & Test in Europe, pp.1397–1402, April 2009.
[4]Chun Wei Lin, Bing Shiun Hsieh, Chih Wei Chung, “PWM-based multilevel class-D amplifier with integrated over-current protection system,” Proc. IEEE Industrial Electronics and Applications, pp. 1394–1398, June 2010.
[5]Shiang Hwua Yu, Yung Huei Tsai, “Sliding-mode quantized control of a class-D audio power amplifier,” Proc. IEEE Power Electronics, pp. 553–556, June 2010.
[6]Wei Shu, Joseph S. Chang, Tong Ge, Meng Tong Tan, “Fourier series analysis for nonlinearities due to the power supply noise in open-loop class D amplifiers,” Proc. IEEE Circuits and Systems, pp. 720–723, December 2006.
[7]Wei Shu, Joseph S. Chang, “Power supply noise in analog audio class D amplifiers,” IEEE Transactions on Circuit and System Ⅰ,vol. 56, no. 1, pp. 84–96, January 2009.
[8]Robert W. Erickson, Dragan Maksimović, Fundamentals of Power Electronics, 2rd ed., New York: Kluwer Academic, 2001, pp. 188–256.
[9]S. K. Changchien, T. J. Liang, J. F. Chen, L. S. Yang, “Fast response DC/DC converter with transient suppression circuit,” Proc. IEEE Power Electronics, pp. 1–5, June 2006.
[10]W. T. Ng, J. Wang, K. Ng, A. Prodic, T. Kawashima, M. Sasaki, H. Nishio, “Digitally controlled integrated DC-DC converters with fast transient response,” Proc. IEEE Radio-Frequency Integration Technology, pp. 335–338, December 2009.
[11]Lars T. Jakobsen, Michael A. E. Andersen, “Digitally controlled point of load converter with very fast transient response,” Proc. IEEE Power Electronics and Applications, pp. 1–10, September 2007.
[12]Wenkang Huang, “A new control for multi-phase buck converter with fast transient response,” Proc. IEEE Applied Power Electronics, vol.1, pp. 273–279, March 2001.
[13]Majd Ghazi Batarseh, Ehab Shobaki, Xiang Fang, Haibing Hu, Issa Batarseh, “New digital control technique for improving transient response in DC-DC converters,” Proc. IEEE Digital System Design: Architectures, Methods and Tools, pp. 793–796, September 2010.
[14]Pang Jung Liu, Huang Jen Chiu, Yu Kang Lo, Yi Jan Emery Chen, “A fast transient recovery module for DC-DC converters,” IEEE Transactions on Industrial Electronics, vol. 56, no. 7, pp. 2522–2529, July 2009.
[15]Man Siu, Philip K. T. Mok, Ka Nang Leung, Yat Hei Lam, Wing Hung Ki, “A voltage-mode PWM buck regulator with end-point prediction,” IEEE Transactions on Circuits and Systems Ⅱ: Express Brifes, Vol.53, no. 4, pp. 294–298, April 2006.
[16]Yie Tone Chen, Cing Hong Chen, “A DC-DC buck converter chip with integrated PWM/PFM hybrid-mode control circuit,” Proc. IEEE Power Electronics and Drive Systems, pp. 181–186, November 2009.
[17]Hong Wei Huang, Hsin Hsin Ho, Chia Jung Chang, Ke Horng Chen, Sy Yen Kuo, “On-chip compensated error amplifier for fast transient DC-DC converters,” Proc. IEEE Electro/Information Technology, pp. 103–108, May 2006.