Actions
Forum Thread Details
  • Replies 97 replies
  • Subscribers 293 subscribers
  • Views 18607 views
  • Users 0 members are here
Related
See a helpful answer?

Be sure to click 'more' and select 'suggest as answer'!

If you're the thread creator, be sure to click 'more' then 'Verify as Answer'!

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.

Parents

  • 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

    I stopped working on this project.

    Website: www.369support.com/1/

    However,  Site is closed to public... personal/internal  use only.

    If you need help let me know.

    Thank you.

  • in reply to lanuser

    Hello, I am interested with your project,  how i can register at your website?

  • in reply to lanuser

    i have Miller DX200 powermodule main points waveforms (oscillograms). Maybe it change Your mind to continue this project? 

  • in reply to alvideo

    it will be Great! you you mind to share waveforms?  Thank you!

  • in reply to alvideo

    Hi , welcome back! I figured you'll continue with this. That's great! Did you actually succeed w/ testing? See if you want to drop interesting materials here, may really help others. Seems the army of dead units owners growing...

  • in reply to serg200010

    Sorry my site for my personal use only.

    If you would like we can continue to work on this project here in this forum / board.

    However, I would like to see other members step into this project and share their finds and test results.

    If someone is interested I can repost Power Module images of reverse engineered info with "mb443" and i.

  • in reply to lanuser

    All waveforms are taken in MMA mode, No LOAD (few years ago from working and tested Dynasty 200 welder).  

    Waveforms test points named as in service manual documentation (Page 70-71) 

    https://elektrotanya.com/miller_dynasty_200sd_dx_technical-manual.pdf/download.html

    01 RC4 1-2 Drive IGBT Gate 28 kHz

    RC4 1-2 Drive IGBT Gate 28 kHz

    02 Main TRANSFORMER XFMR1-XFMR2

    image

    03 RC1 4-3 Boost control (PFC) IGBT Gate 20kHz

    image

    04 PFC Choke LINPUT-LTAP

    image

    05 RC4 5-6 Snubber IGBT Gate 28kHz

    image

    06 LTAP-LSNUB

    image

    07 RC2 4-6 BuckDrive

    image

Reply Children