Abstract
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. The obtained results show that the magnetic field in the most critical area is significantly reduced (i.e., approximately halved) with a very limited influence on the electrical performances (i.e., WPT efficiency decreases by less than 1 percentage point compared to the case without active shielding).
Highlights
Electric vehicles (EVs) are a key factor in the development of a more sustainable transport
A typical wireless power transfer (WPT) system for the wireless charging of an EV is composed by a transmitting coil (Tx) mounted on the ground and a receiving coil (Rx) mounted on the EV underbody
Well-known passivewell-known shielding technique is based performances, but with an increase in Another weight and cost. Another passive shielding on reactive coils, i.e., passive loops that are excited by time-varying magnetic fields produced the technique is based on reactive coils, i.e., passive loops that are excited by time-varying magneticby fields currents induced the source
Summary
Electric vehicles (EVs) are a key factor in the development of a more sustainable transport. The most widely used technology for contactless charging is the wireless power transfer (WPT) technology based on magnetic resonant coupling as it permits transferring high power with an efficiency similar to that of plug-in charging [1,2,3,4,5,6,7] When using this technology, an important problem is given by the magnetic field in the environment produced by the currents flowing in the coils of the WPT system [8,9,10,11,12,13,14,15,16,17,18]. Well-known passivewell-known shielding technique is based performances, but with an increase in Another weight and cost Another passive shielding on reactive coils, i.e., passive loops that are excited by time-varying magnetic fields produced the technique is based on reactive coils, i.e., passive loops that are excited by time-varying magneticby fields currents induced the source.
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