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就国内外对于软开关逆变电源的研究来看，主要集中在通讯电源及航空电源上，经过十多年的研究和发展已日趋成熟。近来，它已开始向焊接电源方面引进，但由于电弧负载的特殊性（低电压大电流，负载变化大等），要把通讯电源上的技术引进到焊接电源中，有必要对其结构进行改进。现在，国内对于焊接电源的研究几乎全部采用串联谐振结构，它存在着较开关范围小（空载或小负载下不易实现零开关）、占空比丢失严重等问题。本文从ＭＬ型谐振结构出发，分析了其原理，给出了其典型波形，同时讨论了ＬＣＬ型谐振弧焊电源的工作原理，建立了其稳态数学模型，讨论了该模型的求解方法，并且应用 ＭＡＴＨ ＣＡＤ进行求解，做了 ＳＰＩＣＥ仿真试验，并把ＳＰＩＣＥ仿真结果与数学模型求解结果进行比较分析，对比结果证明该数学模型正确。
At home and abroad for the study of soft-switching inverter power point of view, mainly in the communications power and aviation power, after more than 10 years of research and development has matured. Recently, it has been introduced to the welding power source. However, due to the particularity of the arc load (low voltage and high current, large load variation, etc.), it is necessary to introduce the technique of communication power source into the welding power source and it is necessary to improve its structure . Nowadays, almost all the research on welding power source adopts series resonant structure, which has some problems such as less switching range (zero-switching under no-load or small load) and loss of duty ratio. Based on the ML resonant structure, the principle of the ML resonant structure is analyzed and its typical waveform is given. The working principle of the LCL resonant arc welding power source is discussed. The steady-state mathematical model is established and the method of solving the model is discussed. MATH CAD is used to solve the problem. The SPICE simulation test is carried out. The results of SPICE simulation and the mathematical model are compared and analyzed. The comparison results show that the mathematical model is correct.