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TIDA-01604: Why are there three phase for the Totem-Pole PFC ?

Part Number: TIDA-01604

Hi Expert,

I have question about below system diagram. As discussed earlier in this TIDA, it only says use two phase for positive half cycle and negative half cycle. Whereas in the real design, there are three phase with 120 degree shift. I don't really understand the relations between them. Could you please help to explain a little? Thanks.


Elec Cheng