Cross-coupling coefficient estimation between multi-receivers in WPT system

For Wireless power transfer with multi-pickup, cross coupling among multi receivers is an inevitable problem which will greatly influence the system performance. Due to its complexity, there is not one identification method yet. This paper proposes a cross coupling-coefficient estimation method, only the primary current is need to be detected. By decoupled one secondary pickup circuit, the mutual inductance between the primary and secondary sides can be estimated. And then the cross-coupling inductances can be estimated when the secondary pickup circuits are all worked. The feasibility of the estimation method is verified by the simulation and experimental results, and the results show that the estimation accuracy is higher when the two mutual inductances are identical.