弧焊逆变器输出电流本脉冲反馈控制

Feedback Control for Welding Current in Present Output Pulse of Inverter

提出了基于输出电流瞬态信息处理的逆变器脉宽调制方法（即本脉冲ＰＷＭ控制），可在整个电弧负载变化范围内实现焊接电流的无超调快速控制，既满足了各种焊接工艺要求，又保证了逆变器的运行可靠性。本文阐述了其反馈控制基本原理及系统静、动态性能的数学分析和试验研究结果。

A PWM method named present pulse control for inverter, which is based on the treatment for instantaneous signal of welding current, was proposed in this paper. Rapid regulation without overshoot of welding current can be realized in the whole range of arc load. It meets requirments of varied welding processes and ensures the performance reliability of inverter. The basic principle of feedback control and mathematical analysis of the static and dynamic property, as well as the experiment results were described in this paper.