氬焊設備在國家的重大建設中，是一項非常重要的技術，常被應用於建築業與汽車工業。依照焊接物的不同，氬焊設備之輸出電流主要可區分為交流電流與直流電流兩種。本論文的目的在於研製大電流輸出之交直流兩用變頻器，主要針對傳統交直流兩用變頻器的缺點加以改良，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，分別為雙電感型變頻器及耦合電感型變頻器，並且分析其基本工作原理。此兩種變頻器皆具有電弧燃燒穩定性佳、輸出電感上無高電壓突波、無需要吸收大能量之緩振電路、高功率輸出時效率佳等優點。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)。最後所實作變頻器之輸出電流規格可達交流100 A、責任週期為50 %、頻率100 Hz。

Arc welding machines are widely used in the construction and car manufacturing industries. The output current of an arc welding machine can be of AC or DC type, depending on the welding loads. The purpose of this dissertation is to develop a high output current switching power inverter for both AC and DC welding applications and improve the performance of the conventional ones. Two inverter topologies, double-inductor type and coupled-inductor type, are presented and analyzed. Both types have advantages such as excellent arc stability, no high voltage spike across the output inductor, no need of snubber circuits, and higher efficiency during high output power. The 8051 micro-processor incorporated with other logic ICs is adopted to implement the control circuit. In high power applications, the insulated gate bipolar transistors (IGBTs) are often chosen as the switches for their high current capability. Finally, experimental results of the two prototypes are demonstrated. The output AC current can reach the rated 100A level with a frequency of 100 Hz and a duty cycle of 50 %.

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