Multivariable Compensation for Wireless Power Transfer Systems in Dynamic Environments

Abstract

The growing number of publications concerning the dynamic compensation of inductive links has demonstrated the importance of the issue upon the WPT system design. There is not still a final and consolidated solution for the case when the coils are in relative movement with each other or misaligned. In this context, this chapter intends to give some contributions to that area, starting with the modeling of the inductive link in Section 2, where the authors show how the magnetic coupling coefficient and the load influence on the PDL. In addition, Section 2 also presents how the excitation frequency and the matching capacitances can improve the PDL. In Section 3, the variable excitation frequency method is explained as well as the hardware needed for the implementation. The voltage-controlled capacitance as a variable element in the matching network is shown in Section 4. Finally, in Section 5, optimization techniques are presented by using both frequency and capacitance to maximize the PDL.