Why 2 or 3 elements will conduct in my ac/ac converter?

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a_tek7

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ac/ac converter

Can any body tell me when and why 2 or 3 elemets will conduct together in these 2 ac/ac converter?
 

Re: ac/ac converter

To understand that, you should draw voltage/time graph of 3 phase system. You would see that at any time you have two phases with one polarity and one phase with oposite polarity and that is when 3 elements conduct current. Exceptions are moments when any phase passes through 0(every 60º), that is when only two elements are conducting.
 

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