0°≤ a <60°:三通与两通交替,每通180°-a 。但a=0°时一直是三通。负载上的电压波形线电压和相电压波形交替连续出现
F.
60°≤ a <90°时:两通,每通120°。负载上的电压波形线是相电压波形连续出现< /div>
G.
90°< a <150°:两通与无晶闸通交替,导通角300°-2 a。负载上的电压波形相电压波形断续出现
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