The stepping motor of wire feeding is controlled by a pulsed current, which is output from the HSO.1 port of a 80C196KC single-chip microcomputer(SCM) and thus oscillating feeding of wire is realized.

• 通过改变焊接回路的电压反馈比例获得脉冲电压，利用给定电压调节短路电流，用80C196KC单片机的HSO.；1口产生脉冲波形控制送丝步进电机，形成脉动送丝方式。