Abstract
SummaryAt present, power converter systems with d.c.-link on the basis of hard switching dominate in the field of power electronics. However, higher switching frequencies are necessary to reduce the noise as well as the size and weight of passive energy stores in a lot of applications. There are two ways to realize soft switching processes in principle: Zero-Current-Switching (ZCS) and Zero-Voltage-Switching (ZVS). The paper describes the behaviour of NPT-IGBTs at hard and soft switching (ZVS, ZCS).The internal processes of the Non-Punch-Through (NPT)-structure are analysed on the basis of a new very accurate PSpice IGBT model.Additional measurements show that NPT-IGBTs possess a very good behaviour under hard switching conditions. By contrary to that Punch-Through (PT)-IGBTs offer the best features at soft switching.
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