A Multiple-Gain-Reconfigurable-Rectifier-Based IPT System for Battery Multistage Constant-Current High-Efficiency Wireless Charging
Yefei Xu, Yong Li, Yang Chen, Wei Zhou, Ruikun Mai, Zhengyou He
Abstract
Inductive power transfer (IPT) technology is widely used for battery charging, whereas trickle charging is necessary for precharging a deeply discharged battery to prolong its lifetime. However, the trickle charging current is much less than the rated charging current. This leads to a challenge for IPT systems to achieve trickle charging and high transmission efficiency as well. In this article, a multiple-gain-reconfigurable-rectifier (MGRR)-based IPT system is proposed for the battery multiple stage constant-current (MSCC) high-efficiency wireless charging, especially for the deeply discharged battery MSCC high-efficiency wireless charging. With the MGRR, the IPT system can theoretically achieve 1.0, 0.5, 0.25, and 0.125 times of the rated output. Thus, trickle charging can be realized without a complicated control scheme. Calculation analysis shows that the proposed IPT system can simultaneously satisfy the battery charging requirements and achieve a near impedance matching for the high transmission efficiency. Finally, a 164-W prototype is built to validate the performance of the system. Experimental results show that the MGRR-based IPT system can effectively charge a deeply discharged battery with a high transmission efficiency as the efficiency in the entire charging process ranges from 89.4% to 93.7%.