Miller DX200 welder SEMIKRON SkiiP 33NEC125T2 Power IGBT Module

I do not take credit for someone else's work.

Here is the assumed topology of the OEM diagram:

I am doing in this order:

Separate Diode Power Bridge Rectifiers from IGBT components to reduce a heat spread.

OEM PART IMAGES:

Now side by side:

Here is someone else's work so I do NOT take credit for reverse engineering ( also this all just assumption based on this diagram )

Based on the diagram on the image following components is no longer available for sale:

Component released on : July 2007

And last but not leased another member of this forum made a PCB preview ( PCB not complete and needs redesign )

it seems the bottom right corner of the original has 4 IGBTs in parallel which are used for PFC, not really critical if higher amps IGBTs used.

Another thing is I will attempt to measure the threshold value of Vge for main IGBTs. Will publish when I'm done, so we can compare with FGL40N120 on schema above.

I redraw module inside wiring like original, exept i added for all IGBT gate resistors.   

In wiring connectors names are like in module picture (see below).   

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Here some more wiring outside module to understanding topology

Thank you for sharing information !!!

Can I ask for detailed information for Gate Voltage Drives? I would need to pick proper Zenner Diode to avoid voltage jump for unrealizable power source.  

Also keep in mind per your schematic above: Q3 & Q4  also should have 6-9Ohm to gate & should not have floating Gate.

Thank you so much for sharing info.

I have to welder, Miller Maxstar 200 LX and Miller Maxstar 200 SD. LX has a problem with discrete elements, I will share photos of my board and what I fixed, SD has a broken IGBT ( Q4 is shorted , I have cut the wires connected to it, haven't check it yet, waiting for components) 

This is module wiring, exept added resistors and two zener diodes. Also in wiring missing 3 ph bridge rectifier. In welder is a lot of space to mount serparate bridge on radiator like this 

Need more wiring modifications or add/remove components?  Any suggestions?

If not, time to choose correct and specific ALL IGBT and diodes D1-D4.    

Do you have your Brocken / Damaged Module on hand?

Yes i do

IMO, Zenner's should be on all IGBT gates. Also R4 R6 10k 

Excellent!

With your approval will be interested to isolate damaged part in Power Module and replaced with external components.

Also will be nice, If someone has discord channel. 

I have enough K25H120J (30pcs),may be we can use it

K25H1203 - 30pcs

K25H1203 - 30pcs