Reconfigurable PSFB transformer

adam18

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Hi i have been working on a reconfigurable phase shift full bridge transformer design for PSFB working at 100KHz. The transformer works either in series or or parallel by adding a third leg of switches to the full bridge.
i wanted to calculate the magnetizing inductance of the transformer when they are connected in series, during which only the two legs are active third leg is not required.
The transformer core used is EE core but the windings are provided as shown in the image. what i am trying to do is to combine two transformers into a single one. Screenshot 2025-03-07 122522.png
The leakage inductance is chosen to be between 2% to 10%of the magnetizing inductance .I wanted to plot a graph of the energy stored in the leakage inductance at different levels of the nominal current, such that i could find the leakage required for ZVS for each case. Can somebody help me with the magnetization inductance , calculation of the transformer.
 
The way you have shown it there is net zero MMF across the centre leg - so it can be there or not - makes no difference.
ok but i am trying to calculate the ZVS energy in the leakage inductance,(0.5Li^2)>CV^2. I am considering leakage inductance to be in the range of 2 to 10 percent of the magnetizing inductance ,the mosfet capacitance is in the range of pF.Zvs.png
This is what iam getting even at light load condition it is showing ZVS.This is too good to be true right?Can you help me where iam going wrong
 

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Don't forget - the total leakage energy drives both sec and pri sides - unless the sec side is shorted - then the total leakage energy would tend to drive the pri side.
 

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