auxilary supply in transformer

[--BawA--]

I have designed an inverter based on smps. In the ferrite core transformer there is an auxilary winding to provide 14VDC regulated after rectification. I want to power up all the ICs from that 14VDC . Till now i am using battery to power up the ICs but the problem is battery voltage is not constant .it varies from 10V to 13.5V .so how to toggle from 12Vbattery supply to 14V regulated supply from transformer during operation as initially the transformer output is 0 . So i have to start the circuit from battery and then switch to 14V provided by transformer.

 

[phobos1]

hXXp://www.diodes.com/_files/design_note_pdfs/zetex/dn82.pdf

 

[FvM]

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