Abstract: Aimed at output control of inductive power transfer systems, a novel energy injection adjusting strategy is presented. The output adjusting strategy is realized by switching between energy injection mode and free resonance mode. Furthermore, the energy equilibrium relationships of each switching mode in resonant network are presented. The output control is realized by duty cycle control of energy injection according to the relationships among energy injection, storage, and dissipation. The controller is designed and realized on the basis of energy analysis to avoid complex nonlinear system modeling. Finally, experiment results verify the energy injection adjusting strategy and the controller design method.