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Problem with farward converter

Discussion in 'Power Electronics' started by Rajesh1268, Oct 10, 2019.

  1. Rajesh1268

    Rajesh1268

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    0
    Oct 10, 2019
    in half bridge forward converter, with switching frequency of 25 KHz, DC voltage of 320 v and current of 6 amps, IGBTs are failing after 5 to 10 minutes without heat and all three terminals will be short i tried by varying gate drive resistor from 10 ohms to 100 ohms i used Infeneon make 40 amps 650 volts IGBTs How do i solve this problem
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    Start by uploading a circuit diagram. Analyzing a circuit from a verbal description is no fun ;)
     
  3. Rajesh1268

    Rajesh1268

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    Oct 10, 2019
    I have uploaded the circuit drawing please go through it
     

    Attached Files:

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  4. Harald Kapp

    Harald Kapp Moderator Moderator

    9,414
    1,925
    Nov 17, 2011
    Your image has a very low contrast and is barely readable. Please try again with an improved image.
     
  5. WHONOES

    WHONOES

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    May 20, 2017
    From the little I can glean from you faint diagram, it looks like you are using a push - pull drive. One of the problems with this topology is that you can have a problem called "Shoot Through". This arises from both the output devices being very briefly on at the same time causing a large current to pass through them. You need a dead band circuit to ensure this does not happen. There are various drivers available the have this circuit built in.
     
    Harald Kapp likes this.
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