The first part of this study offers a unified criterion to classify resonant converters, according to characteristics derived from a block diagram of a generic resonant converter. Therefore, the terms "resonant evolution" and "resonant commutation" are introduced in order to centre the rest of the research on resonant converters with resonant evolution. When Resonant Evolution Converters are studied, it is interesting to know the types of commutations they have. Therefore, commutation types in both voltage and current fed resonant converter are analyzed. A method to evaluate the commutation losses is proposed and in certain cases, the use of capacitive snubber is justified together with its selection criterion.
In Resonant Evolution Converters, two commutations can be found in a semi-cycle of switching. Once their type is known it is easy to define zones where the converter works with interchange of energy between the primary input source and the load, and zones without this interchange. These areas will be shown for three different converters, together with other experimental and simulation results.
Part II of this paper can be found in EPE Journal Volume 1994-4.
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