Design of LCC-S Compensation Topology and Optimization of Misalignment Tolerance for Inductive Power Transfer

This paper proposes a novel parameter tuning method topology for inductive power transfer (IPT) system with excellent load-independent current output. Based on LCC-S compensation topology, detailed derivations of parameters to realize load-independent current output is systematically analyzed. The realizations of zero voltage switching (ZVS) and reactive power demand are discussed by theoretical deduction and numerical simulation. Moreover, from the perspective of maintaining stable transmission power, the parameters detuning method to enhance misalignment tolerance is presented. Theoretical analysis shows that the appropriate detuned resonant tank is advantageous in performance, especially the smoothing of current output to variation of coupling coefficient. The novel LCC-S compensation topology holds high design freedom and high efficiency, while the robust power characteristic against wide misalignment region minimizes the need of complex control. Finally, the IPT prototype is built and test to validate the feasibility of the proposed topology. The efficiency of system is always higher than 86% in tuned parameters and 73% in detuned condition. The fluctuation of current is less than 7.5% when the coupling coefficient varies almost 170% (from 0.293 to 0.5).