Analysis and Comprehensive Comparison of Wireless Power Transfer System Using SS and SP topology for Electric Vehicle Charging

Wireless power transfer (WPT) system now becomes one of the most promising innovations that offer the benefits of more safety, ease of usability, and increased charging range of moving electric vehicles (EVs) compared to conventional wired charging. In real-world applications, suitable measures should be taken to make up for the power transfer coils so that the output power increases and the input apparent power rating of the power converter decreases. Using the idea of the coupled inductor, this paper analyses the concepts employed in the series-series (SS) and series-parallel (SP) compensation topologies of the WPT systems to select an appropriate compensation topology for EV charging. With the help of MATLAB/SIMULINK, the link among the effects of mutual inductance, load, and working frequency on the voltage gain has been analyzed and compared respectively. The simulation findings reveal that the SS compensation topology is better for system applications with lower loads, whereas the SP topology is preferable for systems with higher loads. There is the best possible load for a fixed transfer distance that optimizes the voltage gain and system performance. Furthermore, this study analyses the dependencies of the coupling coefficient and the receiving side quality factor on the transmitting side compensation design using SS and SP topologies. Hence, this article could be used as a reference for a developer to determine the best compensation topology of the WPT system based on EV applications.