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Miller DX200 welder SEMIKRON SkiiP 33NEC125T2 Power IGBT Module

mb443

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 mb443

    Under question ALL resistors Base to Emitter.

    I am fully aware that floating base should not be floating, however, 1K value under question. ( we do not know yet if OEM PM has it build into module.)

    Remember we are assuming at this point. ( I haven't done any test yet )

    Also, we need look into other SKIIP product line that designed for  120 -125 AMP 120 240 380V  PM and check datasheet's.

    We could get away with making PCB spacer for new SKIIP PM. ( to avoid reinventing something already on the market )

    Usually Manufacturers keeps everything similar + - some changes on Gate voltage some less powerful some has more or less IGBT's.

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  • in reply to mb443

    Under question ALL resistors Base to Emitter.

    I am fully aware that floating base should not be floating, however, 1K value under question. ( we do not know yet if OEM PM has it build into module.)

    Remember we are assuming at this point. ( I haven't done any test yet )

    Also, we need look into other SKIIP product line that designed for  120 -125 AMP 120 240 380V  PM and check datasheet's.

    We could get away with making PCB spacer for new SKIIP PM. ( to avoid reinventing something already on the market )

    Usually Manufacturers keeps everything similar + - some changes on Gate voltage some less powerful some has more or less IGBT's.

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