本論文的目的在於研製大電流交直流兩用變頻器，以供作驅動氬焊設備之電源供應器。本論文提出兩種變頻器架構：輸出單電感型變頻器與輸出雙電感型變頻器；在控制電路方面，則以微處理器8051配合積體電路來實現。而在大功率系統中最重要也最容易損壞的電力電子切換元件，則選擇絕緣閘雙極性電晶體(Insulated Gate Bipolar Transistor，IGBT)，文中並詳細介紹其元件特性、驅動電路的製作以及大電流系統之雜訊來源與抑制。最後所實作變頻器之輸出電流可調範圍為交流0~300 A、責任週期為50 %、頻率100 Hz，直流輸出則可達100 A。

The purpose of this thesis is to develop a switching power inverter supplying both regulated AC and DC currents for an arc welding machine. Two topologies of inverters, single-inductor type and double-inductor type, are analyzed and compared. The 8051 micro-processor incorporated with other logic IC’s is adopted to implement the control circuit. The characteristics of IGBT and the snubber circuits are discussed. Also a countermeasure for noise interference in high-current systems is presented. Finally, experimental results of two prototypes are demonstrated. The range of the output AC current is from 0 A to 300 A, with a frequency of 50 Hz and a duty cycle 50 %. The recorded maximum output DC current is up to 100 A.

[1] Welding Handbook, 8th edition: American Welding Society, vol. 2 welding process, 1991, pp74-155.
[2] J. Borka, and M. Horvath, “A new, simple, low-cost, modular arrangement of high power factor for both DC and AC welding,” IEEE Proc. ISIE '99, vol. 2, pp. 757-761, July, 1999.
[3] H. S. Mok, S. K. Sul, and M. H. Park, “A load commutated inverter-fed induction motor drive system using a novel DC-side commutation circuit,” IEEE Trans. Industry Applications, vol. 30, pp. 736-745, May-June, 1994.
[4] S. J. Jeon, and G. H. Cho, “Zero-voltage and zero-current switching full bridge DC-DC converter for arc welding machines,” IEE Trans. Electronics Letters, vol. 35, pp. 1043-1044, June, 1999.
[5] T. F. Wu, H. P. Yang and C. M. Pan, “Analysis and design of variable frequency and phase-shift controlled series resonant converter applied for electric arc welding machines,” IEEE Proc. IECON’95, vol. 1, pp. 656-661, Nov., 1995.
[6] H. Pollock and J. O. Flower, “Series-parallel load-resonant converter for controlled-current arc welding power supply,” IEE Trans. Electric Power Applications, vol. 143, pp. 211-218, May, 1996.
[7] Y. M. Chae, J. S. Gho, G. H. Choe, W. S. Shinand, and J. Y. Choi, “PWM converter-inverter arc welding machine using new type N.C.T.,” IEEE Proc. PESC’98, vol. 2, pp. 1636-1641, May, 1998.
[8] Y. H. Chung, and G. H. Cho, “New current source inverters with DC-side commutation and load-side energy recovery circuit,” IEEE Trans. Industry Applications, vol. 27, pp. 52-62, Jan.-Feb., 1991.
[9] 王順忠譯，“電力電子學”，東華書局，2002。
[10] X. He, B. W. Williams, S. J. Finney, and Qian Z., “New energy recovery snubber configurations for IGBT inverters,” IEEE Proc. Power Electronics and Variable Speed Drives, pp. 54-59, 1996.
[11] Stephen J. Finney, Daniel J. Tooth, John Edward Fletcher,Barry W. Williams, “The application of saturable turn-on snubbers to IGBT bridge-leg circuits". IEEE Trans. POWER ELECTRONICS, Vol. 14, no. 6, Nov. 1999.
[12] N. Mohan, T. M. Undeland, and W. P. Robbins, Power Electronics, 3rd ed, John Wiley&Sons, Inc.
[13] 吳金戊，沈慶陽，郭庭吉，“8051單晶片微電腦實習與應用”，松崗電腦，1995。
[14] 鄧錦城，8051單晶片專題製作益眾資訊，1993。
[15] 楊明豐，8051單晶片設計實務，碁峯資訊，1998。
[16] 陳柏宏，電磁干擾與防止對策，文笙書局，1996。
[17] 廖財昌，雜訊探究與誤動作防止對策，全華科技圖書，1991。
[18] 陳連春，雜訊解析與對策，建興出版社，1999。
[19] 行政院勞工委員會勞工安全衛生研究所，“電焊作業”，2002。
[20] 謝俊明，“不銹鋼電弧焊燻煙暴露危害與評估技術之檢討與建議”，行政院勞工委員會勞工安全衛生研究所，1999。