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ferride core transformer designing formula

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respected sir
I am trying to built a invertor with high efficency about 95%
working on 12 volt dc input & out put of 100 volts ac & out put current of 0.4
amp or (420 milliampre).using saturable core invertor common emmiter
push pull using 2n3055 transistor frequency dosent matter could u please guide me with the formula to be used for the purpose. & could u please
help me finding core saturation flux density so that i can applay the
formula.for turns per volt i am using 2 transformer one for driving the
transistor which will be operated in saturation mode & have small size & other to be used in linear mode having a bigger size so that power losses r less .
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