double side topology

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hai everybody
i am new to this forum .i have designed a power supply please see in the attachment . the primary side is given 250-350vdc and switching the primary to charge charge the 12 volts battery 180AH , If the 300Vdc is absent the secondary side switching takes place to give 300VDC with 250watts continous and the transition period will be less . the primary side topology used is half bride and secondary side topology is pushpull . my doubt is whether this concept of two topology in single tx works and during the transition period whether any effect will occur.please help in this regard
 

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