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TIDM-1000: 关于Vienna整流中性线的问题

Part Number: TIDM-1000

如图,请问在三相三线Viennaa整流中,图上圈起来的地方是如何起到中性线的作用

还有一个问题就是,第二张图片中圈起来的地方是维也纳整流中一相的PFC部分,请问当电源输入通过电感LI后,开关管也导通后,电源的回路在哪里,电源怎么样形成回路为电感储能