基于DSP的脉冲MIG焊数字控制系统

针对模拟控制系统和单片机控制系统灵活性差、控制精度低和可靠性差等缺点，设计了以数字信号处理器（DSP）TMS320LF2407A为核心的数字控制系统，介绍了系统的硬件电路设计和软件框图。同时，采用模糊控制方法对弧长进行闭环控制，以定脉宽调频率的PFM调节机理实现脉冲波形的调制。结果表明，基于DSP的脉冲MIG焊数字控制系统动态响应快、可靠性高、弧长控制稳定、焊缝成形良好，控制效果较常见的模拟控制和单片机控制好；应用模糊控制理论控制电弧，保证了焊接过程的稳定性，解决了脉冲M1G焊多参数的匹配和调节问题。

Digital control system based on DSP for pulsed MIG welding

A digital control system with TMS320LF2407A DSP as its kernel was designed aiming at some deficiencies in the simulating control system and single-chip control system, such as poor flexibility, control precision and reliability.The hardware circuit and software flow chart were presented.In this control system, fuzzy control and close-loop control were applied to control the arc length, and modification mechanism of PFM to modify the pulse shape.The experimental results show that the pulse MIG welding digital control system based on DSP has the advantages of quicker response, better reliability, more stable arc length and better-formed welding seam, over the traditional simulating control system and single-chip control system;furthermore, by using the fuzzy control theory, the stability of welding process is improved and the optimization of multi-parameters match is solved.