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利用直流电抗器获得方波交流电流的工频弧焊电源主电路如图1所示。其基本工作原理是依靠 L 的滤波作用,在单相桥式可控整流器的直流侧获得脉动很小的整流电流,如交流侧没有阻碍电流突变的电感,那么交流电流的波形就近于矩形。同时,利用对晶闸管 T_1～T_4的反馈控制,即可得到所需的静态外特性。这种电源的主要优点,是大大提高了交流电流通过零值时的变化率,从而提高了交流电弧燃烧的稳定性,有可能使电源空载电
The use of DC reactor to obtain the square wave AC current power frequency arc welding power supply main circuit shown in Figure 1. Its basic working principle is to rely on the filtering effect of L to obtain a small pulsating rectified current on the DC side of a single-phase bridge-controlled rectifier. If the AC side does not have an inductance that hinders the sudden change of current, the waveform of the alternating current is nearly rectangular. At the same time, by using feedback control of thyristor T_1 ~ T_4, the required static external characteristics can be obtained. The main advantage of this power supply is that it greatly improves the rate of change of AC current through zero, thus improving the stability of the AC arc combustion, it is possible to make the power supply no-load electricity