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| Crosstalk Suppression Method for Parallel Power and Data Transmission in Magnetic Coupling-Wireless Power Transfer Systems |
| Feng Zhankun1, Dai Xin1,2, Cheng Yijing1, Qin Shuai1, Gao Wenhao1 |
1. School of Automation Chongqing University Chongqing 400043 China;
2. China National Center for International Research on Wireless Power Transfer Technology Chongqing 400043 China |
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Abstract With the widespread application of wireless power transfer (WPT) systems, there is an increasing demand for flexible adaptation to varying operational environments, necessitating real-time high- speed information exchange between power transmitters and receivers. However, current systems still fall short of engineering requirements for power transfer capacity and data transmission speed. This paper proposes a crosstalk-suppression method for parallel power and data transmission in magnetic resonance-based WPT (MR-WPT) systems, with a primary focus on enabling high-speed bidirectional communication.
First, a stacked coupled structure that enables simultaneous power and data transmission is proposed. A pair of shielded aluminum plates forms a data transmission path between the power coil and ground by utilizing interlayer-distributed electric fields, reducing voltage stress on the data circuit caused by power transfer and mitigating crosstalk between the power and data channels. Based on parasitic capacitance distribution between the shielding plates and power coils, an equivalent parasitic capacitance model is established. Then, the equivalent circuit models for both power and data transmission channels are developed. Higher-order filtering networks in the data transmission path suppress strong magnetic interference and system EMI from power transfer, while ensuring high gain for data carrier transmission. The absence of dedicated data coils or shared channels with power transfer simplifies system design.
Subsequently, a parameter design method for the simultaneous wireless power and data transfer (SWPDT) system is proposed. This method effectively reduces strong magnetic interference and system EMI while minimizing the impact of power transfer on data transmission speed. As a result, communication rates are improved. Through channel capacity analysis of the data transmission path, the maximum achievable data rates under different power levels are determined.
Finally, the experimental setup achieved forward and backward data transmission speeds of 21.6 Mbit/s at a system output power of 1 018 W. Under the magnetic shielding provided by metallic plates, the system maintains excellent power transfer performance and high data transmission speed across varying operating conditions, including different power levels and lateral or longitudinal misalignments. The presence of shielding plates slightly reduces the self- and mutual inductances of the power-coupling coils. The power transfer capability is diminished, and a more pronounced shielding effect against electromagnetic leakage is provided. Compared with existing wireless power and data transmission technologies that use shielding plates or parasitic coil parameters, the feasibility of the proposed approach is verified.
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Received: 15 November 2025
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2026, Vol. 41 
