Abstract
In this contribution, the authors evaluate the possibility of using separated access points for power and data transfer in a coupled Wireless Power Transfer-Powerline Communication system. Such a system has been previously proposed by the authors for specific applications, in which Wireless Power Transfer (WPT) should take place in a system where data are transmitted over the power grid. In previous works the authors have performed lab tests on a two coils WPT system equipped with a set of filters to also allow an efficient data transfer. When a multiple coil WPT system is chosen, additional possibilities arise: the access point for power and data can be differentiated, with the aim of maintaining the designed power efficiency and increase data transfer capacity. In this study a four coils WPT system is thoroughly analyzed, modelled, implemented and measured, and a set of guidelines for the correct design (in terms of performance optimization) of the data transfer is given.
Highlights
Wireless Power Transfer (WPT) technology has lately gained increasing attention as an alternative way to transmit power with respect to a cabled connection, see for instance [1,2,3]
Power Line Communication (PLC) has been recognised as a viable option for broadband communications, and it can compete with other, and more diffused, technologies when operating in specific environments
In [9] the full system was designed and built showing the actual feasibility of the proposal; in particular, ref. [9] is referring to a two-coils WPT system. In this contribution the authors investigate for the first time the possibility of using the loops and the coils of a four coils system as different access points: while the power generator and load are respectively connected to the drive and load loop, the data modems are connected between the coils
Summary
Wireless Power Transfer (WPT) technology has lately gained increasing attention as an alternative way to transmit power with respect to a cabled connection, see for instance [1,2,3]. [9] is referring to a two-coils WPT system In this contribution the authors investigate for the first time the possibility of using the loops and the coils (respectively called “outer coils” and “inner coils”) of a four coils system as different access points: while the power generator and load are respectively connected to the drive and load loop, the data modems are connected between the coils. This completely new concept, under specific circumstances, can guarantee a wider communication band, better communication performances. The paper is organized as follows: in Section 2 the rationale behind the main idea is described; in Section 3 it is described how the system has been built according to analytical relations; in Section 4 the theoretical analysis relative to the optimal relation between resonant frequency, distance and load is obtained, while Section 5 presents the analytical and theoretical results for the proposed system
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