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The paper presents a classification methodology of the ZVT soft-transition technique, based on different ways of implementing the auxiliary circuit voltage source. The merits and limitations of each class are presented and their key features and characteristics are discussed and analysed experimentally on 1 kW/100 kHz laboratory prototypes. Using the proposed classification criteria, any ZVT topology can be classified, whether or not they have appeared in publication. Additionally, an overview of the main ZVT PWM converters proposed in recent decades is also presented.