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EMC and EMF safety issues in wireless charging system for an electric vehicle (EV)
No full textA numerical investigation is carried out to assess the EMC and EMF safety compliance of a wireless power transfer (WPT) system used to recharge the battery of an electric vehicle (EV). The assessment is numerically performed considering a WPT system working at the frequency of 85 kHz with output power of 7.7 kW. The prediction of the electromagnetic field is carried out by using a finite element method (FEM) code to model the WPT coils and the chassis of the car. The calculated magnetic field is compared with the International Commission on Non-Ionizing Radiation Protection (ICNIRP) reference level, demonstrating the compliance of the WPT system. Finally, an investigation of the conduced emission (CE) on the battery side is proposed by using SPICE simulations
Magnetic shielding design of wireless power transfer systems
No full textThis paper deals with the magnetic shielding design of a wireless power transfer (WPT) system at the frequency of 20 kHz. A numerical investigation is proposed in order to find the best shielding configuration without degrading the WPT performances
Near-Field Reduction in a Wireless Power Transfer System Using LCC Compensation
No full textThis paper deals with wireless power transfer technology applied to charge the battery of a short-distance electric vehicle. Different compensation topologies (series-series and LCC compensations) are examined and compared in terms of magnetic field emission and system efficiency. The investigation is carried out by simulations and measurements taking into account the variation of the coupling factor due to possible lateral misalignment of the parallel coils, and of the load conditions that depend on the level of the battery charge
Artificial material single-layer method applied to model the electromagnetic field propagation through anisotropic shields
No full textThis paper deals with the extension of the artificial material single-layer (AMSL) method, recently developed to model electromagnetically a thin conductive material using the finite-element method (FEM), to the more general case of transversally anisotropic shields. The analogy between the field equations and the multiconductor transmission line (MTL) equations is here used to calculate the admittance matrix of a thin anisotropic material. This admittance matrix is then imposed to be that of an equivalent circuit with lumped parameters. Thus, it is possible to synthetize the AMSL tensors containing the specific constants to be used in commercial software tools. The adoption of the AMSL method in FEM simulations avoids a fine discretization inside the thin conductive anisotropic material required at high frequency. Simple tests are finally carried out to validate the proposed method
Preliminary Study on Conducted Emission of a Dynamic Wireless Power Transfer System for Automotive
No full textNear field shielding of a wireless power transfer (WPT) current coil
Get PDFThe configuration of an infinite planar conductive shield is examined when it is excited by an electromagnetic near field generated by a coil current source as that of a wireless power transfer (WPT) system. The analytical expressions of the electromagnetic field based on the transmission theory of shielding are given for different frequencies and different incidence angles of the near field generated by the coil current, assuming the conductive planar shield placed in the close proximity of the coil. The obtained results are discussed and compared with other traditional analytical and numerical solutions
Progress in the application of the transmission line theory to near-field shielding
No full textTransmission Line (TL) theory was proposed in the past to model field propagation through conductive shields and it is currently widely used. Recently, this theory has been revisited to investigate the shielding of near-field sources by analytical and numerical techniques. The recently developed methods are here applied to analyze simple configurations of near field shielding
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Conducted emission of wireless power transfer charging system in electric vehicle
No full textAn investigation is carried out to assess the conducted emission (CE) in a wireless power transfer (WPT) system for automotive applications. The assessment is performed by simulations of the whole system which is modeled by a circuit representation of each single subsystem, including the coupled inductive coils, compensation networks, converters and terminations. The obtained circuit model is analyzed using SPICE circuit simulator. The CE is investigated considering two different compensation topologies: series-series (SS) and LCC
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