Shock for the Ignition driver IGBT box.

[KJ_Miller_Cycle]

Hi there, So the current build is running with MS3x and 3.0 main board full sequential fuel and cop ignition. I have an upgraded coil that are dumb and so I built a ignition driver IGBT set up. The problem is that I get shocked when I touch the IGBT housing and any ground. It also does not run smooth. So The system works with smart coil, but I am having spark leakage with my built driver unit and dumb coil. Any help would be great. The ground is attached to the battery negative, the IGBT are the fairchild ones, the mounting tabs are not grounded to the housing.

[Matt Cramer]

Just checking - there ARE mica insulators under the IGBTs, right? If so, make sure the heat sink grease isn't shorting things out.

[KJ_Miller_Cycle]

Hey Matt, I will give that a try and clean up the heat sink compound.

[racingmini_mtl]

If you're using a silver type of compound, they are usually conductive. You need to make sure to use a non-conductive type.

Jean

[KJ_Miller_Cycle]

Thanks for the help... I feel foolish that I missed that my self. I got the super high spec silver compound from my dad and I guess I overlooked that Detail. I have built these several IGBT driver units and always used the white thermal compound grease. So the solution was simple clean off silver and replace with white.