Abstract
The paper provides a low cost, compact and high-power density portable EV (Electric Vehicle) charger for e-mopeds and e-rickshaws. This charging system has two power conversion stage- AC/DC and DC/DC stage. The AC/DC conversion stage is developed with a buck-boost type Vienna derived SEPIC (Single Ended Primary Inductance Converter) and DC/DC power conversion stage is realised with a HB-LLC resonating converter. The AC/DC stage is designed for DCM (Discontinuous Mode of Operation) for overall cost and size reduction of passive components. The PFC (Power Factor Correction) and DC link are maintained through simple DC link voltage follower control. The DC/DC stage is controlled through frequency modulation control for the battery charging rate control. The detailed analysis and design procedure of charging system are given in detail. In this context, a portable EV charger is designed for a 1.5kW maximum power transfer capacity and simulated in MATLAB to verify its effectiveness.
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