On the Design of Magnetic Resonant Coupling for Wireless Power Transfer in Multi-Coil Networks

TL;DR

This paper analyzes the performance of multi-coil magnetic resonant coupling wireless power transfer networks, deriving outage probabilities and optimizing receiver loads through game theory to enhance power harvesting efficiency.

Contribution

It provides a comprehensive analysis of MRC-WPT networks with multiple receivers, including outage probability derivation and a game-theoretic approach for load optimization.

Findings

Derived harvesting outage probability for different coupling regions.

Developed a non-cooperative game for load optimization.

Validated analysis with numerical simulations.

Abstract

Wireless power transfer (WPT) is a promising technology for powering up distributed devices in machine type networks. Over the last decade magnetic resonant coupling (MRC) received significant interest from the research community, since it is suitable for realizing mid-range WPT. In this paper, we investigate the performance of a single cell MRC-WPT network with multiple receivers, each equipped with an electromagnetic coil and a load. We first consider pre-adjusted loads for the receivers and by taking into account spatial randomness, we derive the harvesting outage probability of a receiver; for both the strong and loosely coupling regions. Then, we develop a non-cooperative game for a fixed receiver topology, in order to acquire the optimal load which maximizes each receiver's harvested power. Throughout our work, we obtain insights for key design parameters and present numerical results which validate our analysis.