Simultaneous 3-D Wireless Power Transfer to Multiple Moving Devices With Different Power Demands

A real-time algorithm for simultaneous three-dimensional wireless power transfer to multiple moving devices with different power demands is proposed. An objective function of the weighted sum of the power transfer to the multiple moving devices is formulated. Devices with a more urgent need for charging will have higher weights. The objective function is optimized in real time. By the proposed algorithm, the wireless power transfer system transfers power as much as possible to the multiple devices based on their power demands so that the transfer distance is improved and charging time is saved. The proposed algorithm does not need to know the positions and orientations of the multiple moving devices, which is hard to be obtained in practice. The correctness and convergence of this algorithm are theoretically proved. The experimental results show that the proposed algorithm can adapt to both devices’ movement and power demand variations. The convergence time of the proposed algorithm is 0.2 s when the devices’ power demand urgencies change.