A Power Class Interoperable Reconfigurable Topology for Wireless Charging of EVs

Electric vehicle (EV) wireless power transfer (WPT) system is an important technical path to deal with the global energy crisis and reduce greenhouse gas emissions. By combining the different power classes exhibited by EVs in various scenarios, a reconfigurable topology for the WPT system of EVs was proposed, which can realize the switching of three different power classes without designing additional parameters, and fixing inputs. The proposed adopts power-class interoperability among SAE WPT1 (<3.70 kW), WPT2 (2.96-7.70 kW), and WPT3 (6.16-11.10 kW) power classes, and uses common unipolar and bipolar coils as the magnetic coupling structure for implementation. The purpose is to meet the power class quotas required in different charging periods or different charging scenarios. A 1.6-kW downscaled experimental prototype was established. Under the premise of 100 V input voltage, the maximum system DC-DC efficiency of 90.31%, 92.23%, and 94.02% of the three modes is achieved, respectively. By building a full-power simulation model, regardless of which mode the proposed system operates in, it remains within the safe range of electromagnetic radiation. Finally, in the case of misalignment, the function of the system in anti-misalignment is verified.