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Unusual gate pulses in LLC converter

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biswaIITH

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Hii ,

I am currently working on an LLC half bridge resonant converter for battery charger application.

Below are the gate pulse we captured on the scope.

Yellow one is for high side mosfet & green is for bottom side mosfet.

Any idea why is there a bump on high side pulse before it turns on.?????

Gate_Pulse.png
 

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Can you not feed it all by isolation AC source or isol txformer, and then read the signal with home brew coaxial probe?...beware probe capacitance though.
 

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cupoftea said:
Can you not feed it all by isolation AC source or isol txformer, and then read the signal with home brew coaxial probe?...beware probe capacitance though.
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I have checked the gate pulse via two different differential probes. The top(Blue colored ) is with low CMRR & BW probe & bottom one is with high BW &CMRR probe

1678980020075.png
 
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If the circuit is otherwise performing as expected, I think it's safe to assume the issues with the other waveforms were just probing artifacts.
 
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