Parameter estimation of magnetic coupled resonators used in power wireless transfer

Two procedures for parameter estimation for linear analog circuits are presented and verified on a pair of magnetic coupled resonators used in wireless power transfer applications. The parameters of interest are those which are difficult or impossible to be measured directly. Starting from the equivalent diagram of the analog circuit in sinusoidal behavior, we build the mathematical model based on the modified nodal approach, and then we generate the network function in full symbolic form to obtain an appropriate frequency space representation. The first technique is based on transfer functions in complex form and some experimental measurements of transfer functions in a number of frequency samples. The second approach is based on the transfer functions and the output error techniques. In this case it is used a minimization routine available in Matlab. A relevant example is treated with both methods.