Ricerc@Sapienza

A novel design of active coil shielding is proposed to reduce the magnetic field generated by the currents flowing into the coils of a wireless power transfer (WPT) system for charging the batteries of an electric vehicle (EV). The main idea is to divide the traditional active loop used to shield a source in two separate shielding coils so as not to adversely affect the WPT performance.

This study deals with the optimization of a shielding structure composed by multiple active coils for mitigating the magnetic field in an automotive wireless power transfer (WPT) system at 85 kHz. Each active coil is independently powered and the most suitable excitation is obtained by an optimization procedure based on the Gradient Descent algorithm. The proposed procedure is described and applied to shield the magnetic field beside an electric vehicle (EV) equipped with SAE standard coils, during wireless charging.

This article reports an overview of main issues related to hosting capacity and harmonic disturbances caused by electric vehicle (EV) penetration in a smart grid, taking into account renewable energy sources and energy storage systems as well as nonlinear loads. A new mixed deterministic and probabilistic method based on algorithms and new control strategies, able to perform EVs charging controls, is presented. The methodology shows that it is possible to achieve high levels of power quality, thanks to a pre-evaluation of harmonic disturbance.

This paper deals with the numerical evaluation of the magnetic field emitted by a wireless power system (WPT) in an electric
vehicle (EV). The numerical investigation is carried out using a finite element method (FEM) code with a transition boundary
condition (TBC) to model conductive materials. First, the TBC has been validated by comparison with the exact solution in
simple computational domains with conductive panels at frequencies used in WPT automotive. Then, the FEM with TBC has

An innovative shielding configuration of active coils is proposed to mitigate the magnetic field around an electric vehicle (EV) with a wireless power transfer (WPT) system during battery charging. The active coil is designed to reduce the risk for patients with pacemakers or similar devices produced by the time varying magnetic field generated by the 85 kHz WPT coil currents. A numerical analysis of the magnetic field levels is carried out solving the magneto-quasi-static (MQS) equations by a FEM-based commercial tool.

A novel design of active coils is proposed to reduce the magnetic field generated by the currents flowing into the coils of a wireless power transfer (WPT) system for recharging the batteries of an electric vehicle (EV). The main idea is to split the traditional active loop, in two separate shielding coils. They have semi-annular shape and are placed on the ground pad around the WPT primary coil. The geometry and excitation of the active coils are varied to minimize the magnetic field beside the active coils without degrading the WPT electrical performance.

The paper provides a parametric investigation on the magnetic field produced by a wireless power transfer (WPT) system to recharge the battery of an electric vehicle (EV), varying the position of the secondary coil in the car underbody. The considered WPT charging system operates at the frequency of 85 kHz with a power of 7.7 kW. The WPT system creates a very strong magnetic field that can be critical for human exposure to electromagnetic fields (EMF) and for immunity of implanted medical devices.

This paper deals with the assessment of the induced voltage in an unipolar pacing lead produced by the coil currents of a wireless power transfer (WPT) system for battery recharging of an electric vehicle (EV). In the first part of the work, the magnetic field distributions inside and outside an EV equipped with the WPT technology is carried out by finite element (FE) simulations using the artificial material single layer (AMSL) method.

A study is presented on the magnetic field produced by a wireless power transfer (WPT) system installed in an electric vehicle (EV). The considered WPT charging system operates at the frequency of 85 kHz with an output power of 22 kW. The magnetic field levels are numerically calculated. In the simulations the presence of the conductive bodyshell of the vehicle is taken into account.

A 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.