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对同步方波交流电源（ＳＹＮＣＲＯＷＡＶＥ－３００（Ｓ）方波交流电源）的负半波时间随总电流增加而增加的原因进行了详细的试验研究和理论分析。结果表明：这种陡降特性的可控硅─电抗器式的交流电源的总电流的增加必须通过增加负半波的时间才能实现。这将会造成铝合金交流ＴＩＧ焊和等离子弧焊在大电流焊接时钨极严重烧损，降低电弧和焊缝成型的稳定性。该结论不但对更好地理解可控制硅─电抗器式方波交流电源的工作原理有重要的参考价值，而且对于改造这种电源，使其能较好地用于铝合金穿孔型等离子弧焊有很大的指导意义。
The reason why the negative half-wave time of the synchronous square wave AC power supply (SYNCROWAVE-300 (S) square wave AC power supply) increases with the increase of the total current is studied in detail and theoretically analyzed. The results show that the total current of the thyristor-reactor AC power supply with this steep drop must be increased by increasing the negative half-wave time. This will result in AC TIG welding and plasma arc welding of aluminum alloy in high current welding severe tungsten burning, reducing the stability of the arc and weld formation. This conclusion not only has an important reference value for the better understanding of the working principle of silicon-reactor-based square wave AC power supply, but also is of great reference value for revamping this power supply so that it can be used in aluminum alloy perforated plasma arc welding There is great guiding significance.