Gate protesction against undisired switch on

How about posting a circuit and some pictures of your set up.

MK

Hi Michael, here is the final IGBT

And here is each gate driver stage

Here the layout and highlighted the burned tracks (they correspond to collector high, emitterhigh/collector low and emitter low)

Any suggestion will be precious.

Thanks

Can you show a schematic? It sounds like you are not using a simple spark gap style Marx generator.

I'm not using spark gaps. I'm using IGBT

here is the general schematic

What prevents "shoot through" (both transistors on at the same time)? The lower transistor turns on before the top transistor turns off.

Have you simulated this design ?

Why use 2 IGBT per cell rather than one and a diode ?

Are you connecting the IGBT gate drives to the drivers with long wires (the reason I asked for pictures is that it saves us having to ask these tedious questions).

Doug's suggestion of shoot through sounds likely but I' wondering how we know that the 2 IGBTs are not both driven on.

How many volts are you trying to generate and what is the purpose of this device.

How many cells, was it the first one that burned out.

You need to describe the issue comprehensively to have any hope of good advice.

MK

this schematic is decriptive. in the top image you can see the gate driver stage.

Marx generator needs two igbt, one for charging capacitor and one for discherging on the load during the erecting phase.

Ihoot through is prevented since each rising edge of the gate signal is delayed by 6us but qhen there is no load, the floating voltage between two igbts doesn't discharge and this could cause hard switching (probabily).

Anyway, my question is how to avoid undisered switching on on the high gate

When you ask for help in a forum you are relying on others to expend time and thought on your problem. They are often willing to do so, but only under their own terms.

My terms are that

1) you are not trying to do something evil (but you won't say what this project is for)

2) you are sharing the IP so I can learn from you

You don't seem willing to play nicely so I shall leave you to solve your own problems.

MK

Hi Michael, this marx generator are not for any evil, this will be used for food application trateing oil paste and crushed grapes to increare their organoleptic properties.

I don't what you want to know. This is some simple half bridge in cascade, my question is about how to avoid undesired switching on in a half bridge :)