A Method for Simultaneous Power and Data Transmission in IPT Systems Based on Dual‐Resonant Circuit Topology Design

ABSTRACT Communication between the primary and secondary sides is of critical importance in inductive power transfer (IPT) systems. This paper proposes a method for simultaneous power and data transmission based on a dual‐resonant circuit topology. The approach introduces a parallel branch—consisting of a capacitor and a switch in series—on the secondary side of the IPT system, which resonates with the secondary coil and its compensation capacitor at an additional frequency point. By driving the switch with the data signal, the transmitted information is modulated as harmonics onto the power channel. The data can then be extracted from the DC input current on the primary side. Compared to conventional simultaneous power and data transmission methods, this scheme eliminates the need for additional notch filters or coupling structures, significantly reducing the overall cost and size of the wireless power transfer system. Finally, a 60‐W experimental prototype is built for validation. The results demonstrate that the method effectively transmits data from the secondary to the primary side with negligible impact on the system's original constant voltage output and power transfer performance, confirming the feasibility of the proposed approach.