Port Shore Wireless Power System Using Frequency Bifurcation for Multi-power Levels Interoperability

With the continuous development of “green ports”, more and more electric ships are being used in various industries. Wired charging of electric ships not only requires high manpower, but also has safety hazards such as leakage in the humid environment of the port. Therefore, the wireless charging system at the port have a great significance for the development of electric ships. The existing wireless charging systems can only output a single power level to charge one type of ship. But for electric boats of different sizes, they need to correspond to different charging power levels. This article proposes a method for achieving high power output near 20 kHz and low power output near 85 kHz in the same wireless charging system by adjusting the system frequency. The system can also achieve zero phase angle on two frequencies simultaneously. This method improves the interoperability of the port shore power wireless charging system, reduces the size of the wireless charging system equipment, and makes ship wireless charging more convenient.