Inductive Power Transfer System With Constant Current-Constant Voltage Charging Tolerating Misalignment Based on Multiobjective Optimization for Compensation Topology

Constant current (CC) and constant voltage (CV) outputs are important in the inductive power transfer (IPT) system for battery charging. However, the coupling changes caused by the misalignment between the primary and secondary coils significantly affect the system performance. To address this issue, this article proposes a parameter design method based on the nondominated sorting genetic algorithm-II algorithm for the IPT system to tolerate mutual inductance and load variations in both CC and CV modes. First, a mathematical model of the compensation topology has been established to describe the output characteristics. In addition, the design steps are given to obtain system parameters, and a specific example is designed accordingly. Finally, an experimental setup was built, and the results show that the fluctuation of the output current is less than 0.34% when the load changes from 21 Ω to 24 Ω and the fluctuation of the output voltage is less than 2.69% when the load changes from 24 Ω to 240 Ω as the mutual inductance varies from 20 μH to 30 μH. During the whole process of the CC-CV charging, the maximum efficiency is 93.5%.