Double space vector modulation can realize zero current commutation of the rectifier side, greatly reduce the switch loss, and improve the efficiency of the converter.

双空间矢量调制两级协调控制能实现整流级零电流换流，极大地减少了开关损耗，提高了变换器的效率。

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The centrobaric method was used to determine the position with the maximum modulation value of fringes and the position was used as the point of zero light path difference.

采用重心法确定干涉条纹调制度的最大值位置，并以此作为零光程差位置。

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Secondly, a current for it is developed, which consists of a bridge zero modulation current, signal amplifier and analog filter.

然后为其设计了信号放大、滤波和调零电路；

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