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Synchronous rectification

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Romeo shashi

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Hello all

I am working on 3K phase shift Fullbridge converter here Iam getting softswitching in the primary and in the secondary I am using Diode rectification and Iam getting around 85% efficiency at 1Mhz But I would like to replace these Diodes with MOSFETS to improve the efficiency. How can i give the timing for Synchronous MOSFETS when it is operating in Phase shift mode?
Here I am attaching the timing diagram which i followed
https://obrazki.elektroda.pl/9116800900_1380902213.png

Thank you
 

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