说明：  对应电阻负载：从t1开始把一周期等分为6段，ud波形仍 由6段线电压构成，不会出现负值；在VT1处于通态的120?期间，ia为正，ia波形的形状与同时段的ud波形相同，在VT4处于通态的 120?期间，ia波形的形状也与同时段的ud波形相同，但为负值。电阻负载时α角的移相范围为150°。 对应阻感负载：α ≤60?时 ud波形连续，工作情况与带电阻负载时相似，α >60?时 阻感负载时的工作情况与电阻负载时不同，电阻负载时ud波形不会出现负的部分，而阻感负载时，由于电感L的作用，ud波形会出现负的部分。
(Corresponding Resistance Load: A period is divided into six segments from t1, and the UD waveform is still composed of six segments of line voltage, and there will be no negative value. During the period when VT1 is in the state of 120, the IA waveform is positive, and the shape of the IA waveform is the same as that of the UD waveform in the same period. During the period when VT4 is in the state of 120, the shape of the IA waveform is the same as that of the UD waveform in the same period, but negative value. The phase shifting range of alpha angle under resistance load is 150 degrees. Corresponding to resistance-inductance load: the UD waveform is continuous when the resistance load is less than 60_and the working condition is similar to that of the resistive load. When the resistance load is greater than 60_, the UD waveform will not appear negative part, while when the resistance load is used, the UD waveform will appear negative part because of the effect of the inductance L.)