Room-scale magnetoquasistatic wireless power transfer using a cavity-based multimode resonator

TL;DR

This paper demonstrates room-scale wireless power transfer using a cavity-based multimode resonator that achieves over 37% efficiency in a 3x3x2 meter space, enabling potential delivery of 50 W safely.

Contribution

It introduces a novel multimode quasistatic cavity resonance method for room-scale wireless power transfer, surpassing coil-based limitations.

Findings

Achieves over 37.1% efficiency in a 3m x 3m x 2m room.

Generates multiple magnetic field patterns using eigenmodes.

Potential to deliver over 50 W safely.

Abstract

Magnetoquasistatic wireless power transfer can be used to charge and power electronic devices such as smartphones and small home appliances. However, existing coil-based transmitters, which are composed of wire conductors, have a limited range. Here we show that multimode quasistatic cavity resonance can provide room-scale wireless power transfer. The approach uses multidirectional, widely distributed currents on conductive surfaces that are placed around the target volume. It generates multiple, mutually unique, three-dimensional magnetic field patterns, where each pattern is attributed to different eigenmodes of a single room-scale resonator. Using these modes together, a power delivery efficiency exceeding 37.1% can be achieved throughout a 3 m * 3 m * 2 m test room. With this approach, power exceeding 50 W could potentially be delivered to mobile receivers in accordance with safety guidelines.