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This paper proposes a model-based control method in the wireless power transfer (WPT) system by operating a semi-bridgeless active rectifier (SBAR) to suppress the secondary coil current overshoot. By damping the current overshoot, it is possible to reduce the rectifier&#x2019;s rated current and decrease the rectifier&#x2019;s size, which is beneficial for the lightweight-oriented system such as drones. In the control method, an inverse of the plant model is used to calculate the reference input to the system. The current overshoot is reduced by operating the SBAR under the duty ratio calculated from the model. To confirm the performance of the proposed method, the simulation and the experiment using the WPT prototype are conducted. The experimental results show that the proposed method can suppress the secondary coil current overshoot. The results suggest it is possible to realize the lighter secondary system by applying the proposed method.

Proposal on Model Based Current Overshoot Suppression of Receiver Side Coil in Drone Wireless Power Transfer System