Starting from the turn-off characteristic of the IGBT, the importance of protection against overvoltages is developed in the present article. A comparison of the active and passive protection concepts customary up to now illustrates the advantages and disadvantages of these measures with regard to integrability and reliability. A new active protection concept for voltage controlled components on the basis of an IGBT is presented. The outstanding feature is its good integrability. The critical time slot resulting from the operation of most active protective measures is avoided. The operability and reliability of the protective measure can be demonstrated with the aid of measurements.
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