Abstract
Wireless power transfer provides an opportunity to charge electric vehicles (EVs) without electrical cables. Two categories of this technique are distinguished: Stationary Wireless Charging (SWC) and Dynamic Wireless Charging (DWC) systems. Implementation of DWC is more desirable than SWC as it can potentially eliminate challenges associated with heavy weight batteries and time-consuming charging processes. However, power transfer efficiency and range, lateral misalignment of coils as well as implementation cost are issues affecting DWC. These issues need to be addressed through developing coil architectures and topologies as well as operating novel semiconductor switches at higher frequencies. This study presents a small-scale dynamic wireless power transfer system for EV. It specifically concentrates on analyzing the dynamic mutual inductance between the coils due to the misalignment as it has significant influence on the EV charging process, particularly, over the output power and overall efficiency. A simulation study is carried out to explore dynamic mutual inductance profile between the transmitter and receiver coils. Mutual inductance simulation results are then verified through practical measurements on fabricated coils. Integrating the practical results into the model, an EV DWC power transfer simulation is conducted and the relation between dynamic mutual inductance and output power are discussed technically.
Highlights
electric vehicles (EVs) have gradually become a reasonable replacement for conventional fossil fuel cars with internal combustion engines
The safety and efficiency of Wireless Power Transfer (WPT) systems can be attained by the installation of new protective devices, interconnection protection systems and Energies 2018, 11, 624; doi:10.3390/en11030624
Having considered the abovementioned points, this study investigates the power transfer efficiency of a Dynamic Wireless Power Transfer (DWPT) system transmitting 100 W at 85 kHz
Summary
EVs have gradually become a reasonable replacement for conventional fossil fuel cars with internal combustion engines. Their use will assist air pollution and CO2 emission reduction, and extensive deployment of green energy sources [1,2,3,4]. EV charging can be accomplished either using cables (wired) or wirelessly. The wireless charging technique compared to the traditional wired approach has recently become more engaging in terms of safety, suitability and simplicity [9,10]. Since charging cables are not required for Wireless Power Transfer (WPT); the hazards of tripping, arcing or getting electrocuted while plugging or unplugging batteries in a wet environment are eliminated. The safety and efficiency of WPT systems can be attained by the installation of new protective devices, interconnection protection systems and Energies 2018, 11, 624; doi:10.3390/en11030624 www.mdpi.com/journal/energies
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