Analysis of Undersea Simultaneous Wireless Power and 1 Mb/s Data Rate Transfer System Based on DDQ Coil

This article proposed an undersea simultaneous wireless power and data transfer system. It can achieve 1 Mb/s communication rate for autonomous underwater vehicles. DDQ coil was used to design an integrated magnetic coupling mechanism that decoupled the power channel from the data channel. In order to obtain 1 Mb/s communication rate in seawater, the frequency characteristics and eddy current loss of DDQ coil in seawater are studied. By establishing the steady-state and dynamic models of the data channel, the data gain and dynamic response time (DRT) of the amplitude shift keying modulation are accurately calculated. The influences of the parameters on data gain and DRT are analyzed in seawater, and the design procedure of system parameters is proposed. Finally, a 884 W prototype in seawater is built. The power transfer efficiency of the prototype is 94.3%, and the communication rate is up to 1 Mb/s. The experimental results prove the correctness of the theoretical analysis in this article.