Fig. 2From: An improved three-coil wireless power link to increase spacing distance and power for magnetic resonant coupling systemDirectly field-circuit model of a MRC-WPT system. The analysis of the coupling principle of the field-circuit is shown in Fig. 2. The source coil and device coil are coupled with the resonant coils through inductive coupling, and the resonant coils perform power transmission through EM resonant couplingBack to article page