Abstract
As the world is moving towards green transportation, an effective charging infrastructure is needed to meet the demand of electric vehicles (EVs) with different power ratings. High power DC charging will facilitate EVs to charge quickly and reduce the wait time of a customer. As present charging infrastructure is limited to low power and is not compatible with different rated modular battery packs of EVs, this paper demonstrates Resonant Converter (RC) based high power constant current DC Fast charger. Owing to its inherent sensitivity, RCs suffer and fail to maintain rated load current when subjected to deviation in switching frequency and this has been the limiting feature for which they are not explored much in the automobile sector. In light of it, a topology study of about 25 RCs under lumped T, π, Ladder, and branch type structures is reported and examined the frequency dependence of different characteristic parameters in a range of frequencies encompassing the resonant frequency. This investigation conceived a novel RC that has adequate immunity in dealing with frequency sensitivity and also capable of pumping high DC power. The proposed converter is verified with a prototype and results are in close agreement with design.
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