Research on Three-Phase Bipolar Magnetic Coupling Mechanism for Wireless Charging of Electric Ships

The use of wireless charging for electric ships can solve the problem of insufficient safety and convenience, which was caused by conductance connection. And it was suitable for ferries, pleasure boats, official ships and other frequent entry and exit vessels especially. Compared with the wireless charging of electric vehicles, Marine high-power wireless charging devices not only require higher power density and specific power, but also need to take into account the electromagnetic radiation of the magnetic coupling mechanism. Therefore, the current wireless charging technology widely studied in the academic community needs to further improve the power density, specific power, and reduce electromagnetic radiation. In this paper, a three-phase bipolar topology is proposed based on the application scenario of wireless charging for electric ships. The compensation capacitance calculation method is designed according to the cross-coupling of multiphase magnetic coupling devices(MCD), and the compensation capacitance is compared with conventional magnetic coupling mechanisms such as single-phase monopole and single-phase bipolar in terms of electrical stress, power density and electromagnetic radiation. The simulation results show that the three-phase bipolar magnetic coupling mechanism has obvious advantages in the above aspects, which is suitable for the field of wireless charging of electric ships.