Because the clamp effect of DC voltage source, AC side output the rectangular wave voltage waveform, and it has nothing to do with the load impedance Angle.
由于直流电压源的钳位作用，交流侧输出电压波形为矩形波，并且与负载阻抗角无关。
If a voltage change requires that a different tap be selected, the new tap is electronically switched in precisely at the zero-crossing, to avoid distorting the AC waveform.
如果电压变化需要选择不同的自来水，新的电子开关水龙头恰恰是在零交叉，以避免扭曲的交流波形。
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