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This brief presents a magnetic coupling wireless power transfer system configured in a series-series topology and operating at both resonance and anti-resonance frequencies which occur due to the parasitic coil capacitances. It is shown that their effects on system dynamics cannot be ignored. A mathematical model based on circuit theory is developed and the analytical solution for the power transferred to an electrical load is derived. A technique for extracting coil parameters such as resistance, inductance and capacitance from impedance measurements is proposed. The complete model is first experimentally verified and then used for further numerical investigations.

Analysis of Resonance and Anti-Resonance Frequencies in a Wireless Power Transfer System: Analytical Model and Experiments