At present i am working on 1 kW battery charger based on full bridge topology. the charger repeatedly failed due to shoot through. this is not due to overlapping of gate pulse as my maximum duty cycle is 30% only. when i checked the gate pulses of upper and lower mosfet, i saw unwanted spikes during turn on & turn off of the complementory mosfet (waveform attached.) i believe this causes the shoot through. what causes this bounce in gate pulse.? Please also suggest if any further details required.

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