Why does the maximum voltage in the RBSOA (non-repetitive) graph drop when the current is increased?

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If the turn-off breaking current increases, di/dt increases as well and is causing an induced electromotive force L·di/dt due to the internal inductance in the module L. Hence, high voltage will be applied to the IGBT chip and might cause some avalanche breakdown. Therefore maximum voltage needs to be reduced when the current increases.

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