Abstract
In magnetic resonance-based wireless power transfer (WPT), any misalignment between resonators degrades the strength of the magnetic coupling, and the use of a relay does not always improve performance if it is misaligned with a transmitter or a receiver. It is therefore necessary to determine the proper activation of a relay depending on the degree of misalignment. In this paper, we analyze the effect of a misaligned relay on two important performance metrics in WPT, namely output power and efficiency. In particular, we derive the achievable output power and efficiency with optimal load resistance based on an equivalent circuit model, and determine whether it is beneficial to utilize the relay for a given lateral and angular misalignment. By simulation and experimental verifications under various environments, we validate the exactness of our analysis, and we also confirm two interesting observations, namely 1) with regard to performance improvement in terms of output power and efficiency, it is better to deactivate the relay if it is seriously misaligned with the other resonators and 2) output power is more vulnerable to the misalignment of a relay than efficiency.
Highlights
The attractiveness of wireless power transfer (WPT) as a means of enabling the delivery of power to electrical devices has led to its emergence as a promising alternative to the use of power cables
In addition to the characterization of WPT, a number of research avenues have been pursued regarding its improvement with respect to the two key performance metrics of i) efficiency and ii) output power
We model a WPT system with a misaligned relay using an equivalent circuit model (ECM) and derive closedform expressions for achievable output power and efficiency with optimal load resistance
Summary
The attractiveness of wireless power transfer (WPT) as a means of enabling the delivery of power to electrical devices has led to its emergence as a promising alternative to the use of power cables. Lee: Effect of Misaligned Relay on Output Power and Efficiency in WPT TABLE 1. We investigate the effect of misalignment of a relay on the achievable WPT performances in terms of output power and efficiency. We model a WPT system with a misaligned relay using an equivalent circuit model (ECM) and derive closedform expressions for achievable output power and efficiency with optimal load resistance. 1) the use of a relay can reduce the achievable output power and efficiency if it is severely misaligned with a transmitter and a receiver. Lee: Effect of Misaligned Relay on Output Power and Efficiency in WPT.
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