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Design Optimization of Various Contactless Power Transformer Topologies for Wireless Charging of Electric Vehicles
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| Author(s) |
Hedieh MOVAGHARNEJAD |
| Abstract |
Contactless power transfer (CPT) has demonstrated its ability as a safe, efficient and convenient way for electric vehicle (EV) charging systems by providing acceptable power levels with tolerance to misalignments. The magnetic design of the primary and secondary coupler is one of the most critical parts of a CPT system design. This paper investigates various configurations of loosely coupled magnetic couplers, which could possibly be used in CPT systems to provide wireless charging of the on- board battery of EVs. Six different structures were investigated in this paper and important factors influencing the power transfer at a fixed frequency with excitation of the primary pad were considered as design metrics. Detailed comparisons of each topology with its structure characteristics are extracted. All the models presented in this paper are simulated with a 3D finite element modeling software package MAXWELL. Each configuration is designed so that which is able to provide at least 250 VA of power transfer both at the air gap and lateral misalignment of 20 cm. A system consisting of a double D coil in the primary side and a double D coil with an overlap in the secondary side (DD- DD\_int) seen to have the highest k and resonant power per quality factor (P Resonant /Q) when the couplers are placed precisely aligned and also have better coupling even at high misalignment positions in comparison with other topologies investigated in this paper. A DD-DD\_int configuration of couplers has been built to validate the simulation results. The couplers were series tuned and provided an output power of 2 kW with an efficiency of 94\% when the couplers are centered. |
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| Filename: | 0438-epe2016-full-17153150.pdf |
| Filesize: | 601.7 KB |
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| Type |
Members Only |
| Date |
Last modified 2017-04-13 by System |
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