Pls advise!!

Discussion in 'General Electronics Chat' started by wkyong, May 23, 2008.

  1. wkyong

    Thread Starter Active Member

    Apr 29, 2008
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    I am repairing a UPS system which inverter IGBT using 2MBI150N-120 (150A 1200V) was found faulty,and I just have 2MBI150N-060(150A 600V) in stock,do you think that I can use 2MBI150N-060 instead of 2MBI150N-120?The DC rectifier Voltage produced to the IGBT pins C1 & E2 is just 435Vdc.Thanks!!!!
     
  2. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
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    I'd try it. It may not have as great a mean time between failure in your application.

    Do you know why the N-120 failed?
     
  3. mrmeval

    Distinguished Member

    Jun 30, 2006
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  4. wkyong

    Thread Starter Active Member

    Apr 29, 2008
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  5. SgtWookie

    Expert

    Jul 17, 2007
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    The BRAND of IGBT's you use shouldn't really make much of a difference, as long as they meet the specifications required.

    If you replace an original part with one of lesser specifications, it may not last - or may not work at all before letting the smoke out.

    I would check that output transformer carefully to make sure there is nothing wrong with it.

    Make sure that your heat sinks are installed properly, free from corrosion/contamination, and that you use heat sink compound.
     
  6. nanovate

    Distinguished Member

    May 7, 2007
    665
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    Those two parts are not the same size... the 1200V is larger and handles more power. 600V is not much margin above 453V even for this topology SMPS. I do not see any snubber across the IGBT. I'd verify the control to the IGBTs is functioning properly since a malfunction would definitely "let the smoke out" as was mentioned earlier.
     
  7. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
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    Also check C1 to insure there is no shoot-through, and check any load as well. The original IGBTs may have failed due to a reflected short.
     
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