Research of the Laboratory Prototype for the Battery Charging System Based on Wireless Power Transfer

The paper discusses the laboratory prototype for the battery charging system with a resonance power converter that is investigated to develop a wireless charging system for movable devices using this technology as the basis. The text contains a theoretical description of such devices, as well as the experimental results including determination of the resonant frequency, research of the laboratory prototype in the cases when there is coils misalignment, and when the foreign object is located between the coils, and calculation of the overall system efficiency.The research established the wireless power transfer effectiveness depending on the distance between the coils and the misalignment distance. As a result, the threshold distance was found, at which the coupling coefficient of the coils decreases sharply, which leads to an abrupt decrease in the efficiency.In the final part of the paper, the necessity of further research aimed at the system’s mathematical model refinement is justified. Nevertheless, research of the laboratory prototype shows that within the identified limiting factors, the charging system based on wireless power transfer with the resonance power converter is efficient and can be scaled to wireless charge systems for movable devices.