Help with LTSPICE Simulation please :)

Discussion in 'Power Electronics' started by selvac19, Apr 26, 2018.

  1. selvac19

    Thread Starter New Member

    Dec 23, 2017
    26
    0
    Hello community!

    I am trying to run a simulation but I have been having trouble with the components and their respective outputs. The purpose of the simulation is to verify if the gate driver is adequate for the IGBT model I am trying to control.
    The IGBT model I am trying to use for simulation is not the actual component that will be purchased for the definite design.

    Gate Driver model: UCC5390SC from Texas Instruments.
    IGBT model: IXYH82N120C3 from IXYS

    Please let me know any question for clarification. THANKS IN ADVANCE TO ALL!
     
  2. ericgibbs

    Moderator

    Jan 29, 2010
    5,981
    1,131
    hi 19,
    Do you have a sub or mod file for the uuc model you are trying run.?
    E
     
  3. selvac19

    Thread Starter New Member

    Dec 23, 2017
    26
    0
    These are the models I have for each component. I downloaded them from their respective websites.
     
  4. ericgibbs

    Moderator

    Jan 29, 2010
    5,981
    1,131
    hi 19,
    It always makes it easier to get help, if non standard LTS models are uploaded with the asc file, thanks.
    I don't have time to run the files today, but I am sure others will be interested.
    E

    @Bordodynov
     
  5. selvac19

    Thread Starter New Member

    Dec 23, 2017
    26
    0
    I am honestly confused with the files I uploaded as I downloaded them from the manufacturers website but I see they are not in mod file extension and such. What should I do?
     
  6. eetech00

    Senior Member

    Jun 8, 2013
    1,168
    240
    Hi

    Try the attached files
    I modified the UCC5390 model file so it will work with LTspice.
    Also...Use the attached symbol file.

    eT
     
    Bordodynov and ericgibbs like this.
  7. selvac19

    Thread Starter New Member

    Dec 23, 2017
    26
    0
    I highly appreciate your help with this. I have been stuck working on this for months as I was unable to find the proper driver for this IGBT, and now running the actual simulation.
    What was the issue with components in simulation?
    What was missing so I understand why know it is working as it should :)

    Thanks a lot, indeed.
     
  8. eetech00

    Senior Member

    Jun 8, 2013
    1,168
    240
    Hi

    1. While LTspice is compatible with pspice code, There are some device statements that cause issues with LTspice.
    I've learned over time to recognize which statements need to be reformatted. I identified those and fixed them.
    2. VCC1 sets the expected logic voltage levels at the IN+/IN- pins. VCC1 was set to 5v but the pulse generator was set to 3.3 volts.
    The outputs remained off since the input voltage level never reached a high enough voltage level to turn the outputs on.
    I set them both to 3.3v.
    3. I believe this circuit was derived from design example 11.2.1 on the TI datasheet. The pulse generator wasn't set to 10Khz. I set it to 10Khz.
    4. I noticed there were negative going spikes on the trailing edges of the IGBT output pulses. I reset the gate resistors to 10 ohms and that cleared it up. I didn't explore any further why and leave that up to you to research.

    BTW- Some spice models will include external device models used to test the circuit.
    The UCC5390 model file is such a model and actually includes a IGBT transistor definition in the file. see ".SUBCKT IGBT C G E" line close to the end of the file.

    eT
     
    Last edited: Apr 27, 2018
    Bordodynov likes this.
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