  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's rated current and decrease
the rectifier'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.
