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以ＺＸＧ－２５０型硅整流弧焊机为例，介绍了采用ＭＣＳ－５１单片机控制弧焊电源外特性的原理和方法，阐述了闭环控制系统的硬件结构和软件特点。
Taking ZXG-250 silicon rectifier arc welding machine as an example, the principle and method of controlling the external characteristics of arc welding power supply by using MCS-51 single-chip microcomputer are introduced. The hardware structure and software features of the closed-loop control system are expounded.