本文主要对工频交流方波弧焊电源电流动态过程进行分析,阐明在换向时间内,主回路中两组可控硅分别由截止到导通和由导通到截止的过渡过程中电流的变化,以及影响换向电流上升率及换向时间的各种参数,以便合理选择电源中可控硅元件的动态参数值。 This paper mainly analyzes the dynamic current of the AC-DC square-wave arc welding power supply, and shows that during the commutation time, the two groups of thyristors in the main circuit are respectively controlled by the current from the cut-off to the conduction and from the conduction to the cut-off Changes, as well as various parameters that affect the rate of change of the commutation current and the commutation time so as to reasonably select the dynamic parameter values ​​of thyristors in the power supply.