Research on Anti-offset Characteristics of Double-Layer Overlapping Coil Used in Inductive Wireless Power Transfer system

In order to deal with the problem of efficiency decreasing caused by the lateral offset of the wireless power transfer coil, a double-layer overlapping coil structure is proposed, which can realize multi-load charging and has strong anti-offset performance. First, the circuit model of the double-layer overlap coil system is established to analyze the factors that affect the efficiency of the system; secondly, the double-layer overlap coil model is established by COMSOL simulation to study the relationship between the efficiency of multiple charging areas and the lateral offset. Finally, in order to verify the authenticity of the theory and simulation, the experiment device is implemented and experimented results show that the change in the magnetic flux of the receiving coil will affect the coil efficiency. When lateral misalignment occurs, the proposed double-layer overlap coil structure can maintain high and stable magnetic field strength enables the system to effectively maintain high-efficiency energy transmission.