Multiple Design Methods for Constant Current Wireless Power Transfer Systems Without Receiver Compensation

ABSTRACT

The traditional wireless power transmission (WPT) system has a complex receiver compensation structure, many compensation components, and the output characteristics are significantly affected by the parameters of the magnetic coupler. In this paper, three WPT system topologies without compensation at the receiver are proposed. The proposed topology can decouple the output current from the load without compensation at the receiver and ensure the system works at zero phase angle (ZPA). Compared with the traditional scheme, the proposed system has obvious advantages in structure compactness, effectively reducing the hardware cost of the system and improving the structure compactness. Among them, for the three coil structure, the use of magnetic integration technology can further reduce the number of components, which can meet the design requirements under the condition of only a single compensation component. In addition, two kinds of structures in the proposed topology can realize the decoupling between the output current and the parameters of the magnetic coupler. Finally, taking the double coil structure as an example, an experimental prototype with an output current of 2 A is built. The experimental results show that the system can achieve stable and constant current output while maintaining high transmission efficiency, and the maximum efficiency can reach 94.68%.