--- In LTspice@..., "Rick" <sawreyrw@...> wrote:
--- In LTspice@..., Philip Bellingham <rmhc78a@> wrote:
Emma,
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I would also suggest changing your output load from a constant current to a resistor or some thing that more closely approximates a real world load. There are times in this simulation when both IGBTs are off. Since the current source still tries to maintain the specified current, the output voltage will have a magnitude of several thousand volts due to the current source forcing the current through the high impedance presented by the cut-off transistors.
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I have uploaded a version of your schematic file modified as I have suggested (igbt_infineon_modified.asc). It ran for me using the Normal solver with modified trap integration.
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Regards,
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?? - Philip
Typically, the load on IGBTs is highly inductive so it is appropriate to use a current source as a load. Therefore, you need reverse diodes across the IGBTs.
There is obviously something wrong with the IGBT model, since the simulation takes so long.
See faq_11.txt under the Files=>FAQ section of this group for information on timestep and convergence problems.
Rick
Hi Rick and Philip,
Thanks for your comments, they were very helpful! Now I have included freewheeling diodes to the transistors, included "OFF" and I also have a small inductance (1e-6H) in series with the current source at the load. The load is suppose to represent a PMSM motor, that's why I thought I could use a current source as representation. The simulation can now run, thanks!
Kind Regards,
Emma
