Paper Title
Design of Sub-Resonant Frequency Controlled Series-Series Inductive Wireless Power Transfer Link for Electric Vehicles Charging

Abstract
Output characteristics of inductive wireless power transfer link (IWPTL) with battery load are greatly affected by changes in geometrical positioning (misalignment, power transfer distance) and load voltage which may vary during charging process. In order to overcome this problem systems are often designed with greater complexity and larger dimensions since additional elements such as DC-DC converters on primary and sides of the IWPTL reducing overall lifetime and reliability are added. Furthermore, a number of applications introduce operational frequency band constraints, such as the SAEJ2954 standard for electrical vehicle (EV) charging. This paper presents design guidelines for robust solution consisting of series-series (S-S) compensated IWPTL with sub-resonant frequency control which results in a more lightweight system with lesser components and operates within chosen operational frequency boundaries. Example system design process by presented methodology is demonstrated alongside simulations and experimental prototype waveforms. Excellent matching to analytical expectations is evident both in simulation and experimentally. Future work will include guidelines for choosing optimal solution from acquired solution space. Keywords - Inductive wireless power transfer link (IWPTL), series-series (S-S) compensation, sub-resonant frequency control, frequency band constraints.