Dear PLECS Support Team
I have developed an AFE converter model that, in reality, uses the 6 Infineon FS450R17OE4 IGBT module. Due to the high current, each switching position consists of six identical IGBT modules connected in parallel.
When I model all six modules individually using their thermal models, the simulation becomes significantly slower. Therefore, I tried to create an equivalent thermal model by modifying the XML file of a single module so that it represents the six parallel modules.
The modifications I made include:
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Scaling the conduction and switching losses to represent the total losses of the six parallel modules.
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Adjusting the thermal model by dividing the thermal resistances by six while keeping the thermal time constants unchanged.
However, after making these modifications, PLECS reports the following error:
“Unexpected feedback during calculation of switch losses.”
I have attached:
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the original XML file,
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the modified XML file, and
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a screenshot of the error message.
Could you please help me understand what is causing this error? In particular, I would like to know whether my approach for creating an equivalent thermal model is correct, and whether there are any restrictions on modifying the switching-loss formulas in the XML file.
Thank you very much for your time and assistance.
Kind regards
Milan Van de Walle
FS450R17OE4_switch_modification_to_1.xml (15.6 KB)
FS450R17OE4_switch.xml (15.5 KB)
