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Miller DX200 welder SEMIKRON SkiiP 33NEC125T2 Power IGBT Module

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imageThe hot topic for those who owns DX200 welder and willing to participate in re-implementing of the original PowerModule on discrete elements.

This is continuation of the discussion and efforts already put into at other forum:  Miller Boost Circuit Board Assembly NO. 200841

This is a restoration project attempt of reproducing using discreet components an obsolete  power module  which SkiiP 33NEC125T2 no longer produced by SEMIKRON.

DISCLAIMER: This is a high voltage project DANGER. Anyone who joins this experimental project need to be aware of high voltage (up to 1000v) and high currents (up to 100A) which is a high risk and requires to be qualified to work with such circuits and can be done only at your own risk.

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

    Here is the assumed topology of the OEM diagram:

    image

    I am doing in this order:

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

    image

    OEM PART IMAGES:

    image image

    Now side by side:

    imageimage

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

    image

    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 )

    image

  • in reply to lanuser

    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.

  • in reply to alvideo

    Do you have your Brocken / Damaged Module on hand?

  • in reply to alvideo

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

  • in reply to serg200010

    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. 

  • in reply to lanuser

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

  • in reply to lanuser

    The rest of the parts are not a problem.

  • in reply to serg200010

    Before moving forward!

    Did you fix the board the one made your Power Module damage? 

  • in reply to lanuser

    Yes i did. I will share what was broken, tomorrow. 

    I have two welder, and two igbt, first igbt working and i fix welder aswell, another welder has a broken igbt and i fixed boards. I have checked all boards they are working. What do i need to do, buy new igbt or making hand-made substitute 

  • in reply to serg200010

    Understood.

    Can you take some pics of your broken PM?

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