Analysis, Design, and Implementation of a Wireless Power and Data Transmission System Using Capacitive Coupling and Double-Sided LCC Compensation Topology

Wireless power and data transmission (WPDT) is required in many scenarios. This paper proposes a novel WPDT scheme based on capacitive coupling. The power transfer is analyzed, and the power circuit is equivalent to a double-sided LCC compensated wireless power transfer system. The modulation, injection, extraction, and demodulation circuits for data transfer are introduced. The function of each element in the proposed system is explained in detail. In order to facilitate the design of a practical WPDT system, the specific steps are summarized. Theoretical analysis on the interferences between the power transfer and data transfer indicates that the interferences can be significantly diminished by proper design. A 100-W WPDT prototype is built. The measured power transfer efficiency, from dc input to dc output, is 90.5%. The transferred data are correctly recovered in the receiver side at a data rate of 119 kb/s. The data circuit works well even though the coupling coefficient is decreased by 60.2%. The practically measured interferences between the power transfer and data transfer are quite small. The power transfer and data transfer are not affected by these interferences.