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Large Signal Analysis of Arc Welding Power Supply Based on Matlab Modeling and Simulation (基于MATLAB的弧焊电源信号分析的模拟与仿真) Arc welding inverter power switch frequency general in the 20 K-100 KHz between, because the higher the frequency, the bulk and weight of welding machine significantly decreases, and this for precise control of the arc welding inverter power to lay a good foundation because at present arc welding inverter power circuit simulation is used more control, the output signal of arc welding power source is the control precision and no substantial increase thus, the paper improve the precision control of arc welding inverter power of the arc welding inverter power in the system, and from the analysis of the arc of arc welding inverter power electric performance requirements set out to, and put forward the control system of the overall design scheme and design principles adopted TI companys TMS320LF2407 chip as core control chip, using its powerful data processing ability, high speed and high precision 40 MHz 16 bits, plus the single-chip microcomputer control ability strong characteristic, arc welding inverter power to achieve a truly digital in this paper the main part of the arc welding inverter power, established the arc welding inverter power of Matlab model, a simulation method is used to study the process of inverter, the control accuracy and the control effect is analyzed and predicted in this paper is combined with the application of the arc welding inverter power, the characteristics and jumping in the state of the simulation research in control algorithm, using PID control algorithm, and set up the Matlab simulation model, the algorithm is proved reliability and practicability. 摘要：焊接电弧是一种复杂的负载，作为对焊接电弧提供电能的专用设备弧焊电源，它的电气性能就要适应电弧的特性为适应新型弧焊工艺发展的需要，我们必须研制出具有相应电气性能的新型弧焊电源逆变弧焊电源的开关频率一般在20K-100KHz之间，因为频率提高了，焊机的体积和重量明显减小，这为逆变弧焊电源的精确控制奠定了良好的基础 由于目前逆变弧焊电源多采用模拟电路进行控制，弧焊电源的输出信号的控制精度并没有实质性的提高因此，本文针对提高逆变弧焊电源的精确控制对逆变弧焊电源进行了研究在本系统中，从分析电弧对逆变弧焊电源电气性能的要求着手，提出了控制系统的总体设计方