MOSFET question

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Joined Dec 28, 2015

How I can switch on 1st(Upper left side) MOSFET initially if I hadn't started the 2nd(lower left side) Mosfet because as per i know bootstrap capacitor start charging only if it gets a ground which is only possible when 2nd(lower left side) Mosfet is ON. Could anybody please suggest the pwm logic for the gate to turn ON and OFF all the Mosfet to get Sin wave.

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