(1)谐波是特征谐波,只和整流脉动数有关,例如三相对称桥整流,则为6脉动,最低谐波次数为5次,如果为18脉动,则最低谐波次数为17次(理论上没有5、7、11、13等低次谐波),所以大功率整流多采用多相整流,即变压器有多个付绕组,彼此的相角有移位,而且谐波次数愈高,谐波相对值愈小
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