A Study on Dynamic Charging Using Off-Resonant Coil Array With Receiver-side Compensation

This paper proposes a dynamic charging system for moving receiver by using an array of small off-resonant coils in a combination with receiver-side compensation circuit. Compared to the size of receiving coil, transmitting coils are small enough to make the coupling coefficient stable when the receiver moves along the transmit coil array. The compensation circuit at the receiver will be designed to approximately cancel out all the reactive components in the coupling link between the receiving coil and the nearby transmitting coils. As a result, the load will be seen almost directly from the source, and thus, stable output voltage can be achieved even if the receiver moves and/or if the load resistance varies. Experimental results confirm effectiveness of the proposed system.