The construction of an electromagnetic coupling power transfer system is introduced in\nthis paper. Considering the characteristics of the battery charger, a novel parameter design method\nbased on the load of the maximum power transfer point is proposed. Then, the compensator,\nresonant circuits, and some key parameters of the electromagnetic coupler are discussed in detail\nby constructing a mutual inductance model to carry out impedance calculation and analysis.\nCoupling coefficient influenced by different magnetic circuits and coil distribution were analyzed by\nbuilding a finite element model and an equivalent magnetic circuit. Moreover, impedance matching\nand compensation network parameters were theoretically calculated and simulated. Finally, a wireless\npower charger based on an open-loop class E amplifier with the maximum power point load\nconsideration was manufactured. Simulation and experiments were done to verify the analyses,\nand the capability of 4.2 W power delivery at a distance of 10 mm and a peak system efficiency\nexceeding 72% were demonstrated.
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