Pwm driving half bridge

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captainshahid

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hi everyone

i am confused here that in a half bridge mosfet driver opposite pwm drive upper and lower mosfet, as soon as duty cycle increases voltage increases to form a sine wave half cycle but for negative cycle how they works?
 

Supply is + and - . GND is at 0 volts. Now voltage is either positive going or negative going according to postive half and negative half cycle.
 

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