3D‐spatial efficiency optimisation of MR‐WPT using a reconfigurable resonator‐array for laptop applications

Abstract

In this study, magnetic resonant wireless power transfer (MR-WPT) system with a reconfigurable resonator using RF switches (PIN diodes) was studied to improve and optimise the transfer efficiency (TE) in a limited three-dimensional (3D) zone for laptop applications. Generally, the TE of the MR-WPT system is decreased by a 3D spatial variation (distance and location) in between the transmitter (Tx) source and the receiver (Rx) load . To improve and optimise the TE for this spatial variation, the authors utilised RF switches in a planar arrayed coils in the Rx. The TE was optimised by the status of the coil resonator (modes 1-6, open, and short) in the Rx. The average TE of the optimal mode increased >5% comparing with that of a certain mode in the whole range of the spatial variation ( x , y , z directions; 80 × 80 × 40 cm 3 ). In addition, they analytically and experimentally demonstrated the TE optimisation by the practical laptop model with the proposed MR-WPT system installed into a desk ( yz -plane) and the wall ( z -direction). Through this research, the proposed reconfigurable resonator with RF switches was shown to be possible for use as a reconfigurable efficiency optimiser in the MR-WPT system.