Energy Efficient and Adaptive Design for Wireless Power Transfer in Electric Vehicles

Abstract

any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. Additional information:Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Abstract-Wireless power transfer (WPT) could revolutionize global transportation and accelerate growth in the Electric Vehicle (EV) market, offering an attractive alternative to cabled charging. Coil misalignment is inevitable due to driver parking behaviour and has a detrimental effect on power transfer efficiency (PTE). This paper proposes a novel coil design and adaptive hardware to improve PTE in magnetic resonant coupling WPT and mitigate coil misalignment, a crucial roadblock in its acceptance. The new design was verified using ADS, providing a good match to theoretical analysis. Custom designed receiver and transmitter circuitry was used to simulate vehicle and parking bay conditions and obtain PTE data in a small-scale setup. Experimental results showed that PTE can be improved by 30% at the array's centre, and an impressive 90% when misaligned by 3/4 of the arrays radius. The proposed novel coil array achieves overall higher PTE compared to the benchmark single coil design.

Energy Efficiency Analysis through Misalignment on New Design of Hexagonal Coil Array in Wireless Power Transfer

“…From new study about array circle coil design for Tx and circle coil for Rx, the combination cannot reduce the PTE, meanwhile it only reduces the load on EV. In addition, the decreased PTE also happens in tangential boundary area misalignment [16]. Fig.…”

“…The new design will achieve higher PTE in tangential boundary using 7 array circle coil through comparison to the single coil benchmark [31]. We use previous study as a benchmark for measuring and retrieving data [16] and reconstruct the previous coil design (circle coil) to be our new design (hexagonal coil).  Reference coils (7 array circle coil) [8]: both primary (7 array circle coil) and secondary (1 circle coil) coils are 2.5 cm in diameter (Fig.7a).…”

Analysis of multiple segmented transmitters design in dynamic wireless power transfer for electric vehicles charging

“…In a dynamic wireless EVs charging system, EVs can be continuously charged in a dedicated charging lane using multiple coils embedded in the road [1]. EVs can therefore carry smaller batteries and even without batteries.…”

A Survey of Algorithms for Distributed Charging Control of Electric Vehicles in Smart Grid

“…Importantly, fast charging solutions reduce long charging times and potential range anxiety of drivers. Furthermore, wireless power transfer for EVs using magnetic resonance is also gaining widespread interest [15].…”