Transformerless Approaches in Light Electric Vehicle Charger Topologies
People are paying more attention to charging solutions these days. Significant customer repercussions will occur if electricity quality is not maintained. The On-board Light Electric Vehicle (LEV) chargers uses single-stage power converters with improved power factor and high step-down voltage gain. In the case of LEV chargers, their application is limited by the usage of rectifiers and transformers on the front side. LEV chargers should be economical, lightweight, have minimal losses, and minimized distortion. Transformerless converter topologies utilize switched inductor networks in the single-step chargers with power factor correction control topology. The proportions and price of the magnetic elements in the transformers are decreased by the switched inductor networks, which are made up of inductors and diodes. In this article, various transformerless approaches in the charging topologies are discussed and their performance is analysed in MATLAB Simulink. Total harmonic distortions (THD) of source current and power factor are also evaluated to assure power quality attributes with and without rectifiers. THD improved to 2.38% in the transformerless topology.
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