Actions
Forum Thread Details
  • Replies 97 replies
  • Subscribers 293 subscribers
  • Views 18629 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

    So far seems good.

    Lets wait on   on his images.

    Also,   has parts on hand, something I do not have at this moment.

  • in reply to alvideo

    Also seems D6 & D7 seems wrong polarity 

  • in reply to lanuser

    It's not mistake. If You look closer, will see, that Q5 swapped  C with E.  

  • in reply to lanuser

    Next stage - need finally decide choose right IGBT. I think, that all IGBT in wiring are ok, except need additional parallel Q1 and Q4 (2x2 IGBT)  

    Also i not sure with my choice diodes D1-D5  (VS-E5TX3012-M3). Hyperfast 1200V 30A is enough? 

  • in reply to alvideo

    For test we need to make sure unit can power on without load.

    1) Take a snapshot / behaver of the unit

    2) Test voltages 

    3)  Test heat 

    4) Gate voltages 

    After that can move on with small load test, while testing unit with load we need monitor heat on IGBT's 

  • in reply to lanuser

    imageimage

    C11, C18,D2,R6,Q11

    image

    Q4,Q3,Q1,Q2,Q8Q24,Q25,D19,D20,VR4

    image

    C11,C18

    imageimage

    image

    image

    Q4 - is broken

    image

    it is ok

    image

    it is ok

  • in reply to serg200010

    Have you checked if all  leads on Q4 are shorted?

    Also check diode next to Q4

    image

  • in reply to lanuser

    I will check and let you know in 2 hours. 

Reply Children
No Data