Cross-talk Mitigation Using Band-Stop Filters for Multiple-Frequency One-to-Multiple Inductive Power Transfer

Multiple-frequency inductive power transfer (IPT) system is able to independently charge multiple receivers with separated operating frequencies by using only one transmitting platform. Unfortunately, when the operating frequencies are close to each other, the system suffers from cross-talk among adjacent frequency signals. To mitigate the cross-talk, this work proposes using band-stop filters with isolation enhancement design in compensation circuit of the charging platform. Effectiveness of the proposed scheme is verified by circuit simulations and experiments with two-receiver IPT system operating at two adjacent frequencies of 170kHz and 200kHz.