Beamforming for Magnetic Induction Based Wireless Power Transfer Systems with Multiple Receivers

Kisseleff, Steven; Akyildiz, Ian F.; Gerstacker, Wolfgang H.

doi:10.1109/glocom.2015.7417006

Cited by 37 publications

(16 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Beamforming has been investigated for over-the-air wireless channel [131][132][133][134][135][136][137] and MI power transfer [138]. However, there exist no work in the literature on UG beamforming.…”

Section: Signals In the Soil: Propagation Techniquesmentioning

confidence: 99%

A Survey on Subsurface Signal Propagation

Raza

Salam

2020

Smart Cities

View full text Add to dashboard Cite

Wireless Underground Communication (WUC) is an emerging field that is being developed continuously. It provides secure mechanism of deploying nodes underground which shields them from any outside temperament or harsh weather conditions. This paper works towards introducing WUC and give a detail overview of WUC. It discusses system architecture of WUC along with the anatomy of the underground sensor motes deployed in WUC systems. It also compares Over-the-Air and Underground and highlights the major differences between the both type of channels. Since, UG communication is an evolving field, this paper also presents the evolution of the field along with the components and example UG wireless communication systems. Finally, the current research challenges of the system are presented for further improvement of the WUCs.

show abstract

Section: Signals In the Soil: Propagation Techniquesmentioning

confidence: 99%

A Survey on Subsurface Signal Propagation

Raza

Salam

2020

Smart Cities

View full text Add to dashboard Cite

show abstract

“…Typical 2-D systems are constructed by arranging transmitter resonators into arrays; operations on these arrays can be roughly divided into (a) selective activation, which activates the transmitter in proximity of the receiver [12,20,25,47] and (b) phased array-inspired operation, which adjusts the gain/phase of each transmitter element to form a constructive interference at the receiver [11,16,40,52]. In both (a) and (b), it is premised that the transmitter elements are wired to the central power source, which limits shape modification.…”

Section: Magnetic Resonant Coupling Wireless Power Transfermentioning

confidence: 99%

Alvus

Sumiya

Sasatani

Nishizawa

et al. 2019

Proc. ACM Interact. Mob. Wearable Ubiquitous Technol.

View full text Add to dashboard Cite

Wireless charging pads such as Qi are rapidly gaining ground, but their limited power supply range still requires precise placement on a specific point. 2-D wireless power transfer (WPT) sheets consisting of coil arrays are one well-known counterpart to extend this range. However, these approaches require custom-made designs by expert engineers; what we need is a WPT system that can be reconfigured by simply placing ready-made modules on the intended surface (e.g., table, floor, shelf board, etc). In this paper, we present "Alvus", a reconfigurable 2-D WPT system which enables such simple construction of WPT surfaces. Our system is based on multihop WPT that composes "virtual power cords" and consists of three types of ready-made resonator modules: (i) transmitter, which outputs energy, (ii) relays, which pass energy down to the next module, and (iii) receivers, which receive energy and charge the loads. We show that power can be transferred efficiently (over 25%) within a range of 19.6 m 2 using a single transmitter. We implemented an end-to-end WPT system and demonstrated that Alvus is capable of intuitive construction/reconfiguration of WPT surfaces, as well as automatically deciding the power routes based on the sensed information (e.g., receiver location, module placement, obstructive objects).

show abstract

“…As shown in (12), P r:u is also a quadratic form of input current vector i t . Let the minimum required power for user #u be P th u , then P r:u must be greater than or equal to P th u .…”

Section: Multiuser Ipt Using Single-frequency Coil Arraymentioning

confidence: 99%

“…Unfortunately, the load adjusting process can be carried out only by the users; meanwhile, from the practical perspective, it is more preferable to control receive powers from the transmitter-side. To this intent, the work in [12] has exploited the degree-of-freedom of a transmit coil array to manipulate the magnetic field strength, in a manner analogous to beamforming in wireless communications. However, the work is limited to a specific setting of three decoupled coils, making it inapplicable to platform with more transmit coils and in mutually coupled coil arrangements.…”

Section: Introductionmentioning

confidence: 99%

Receive Power Control in Multiuser Inductive Power Transfer System Using Single-Frequency Coil Array

Duong

Okada

2018

IEICE Trans. Commun.

View full text Add to dashboard Cite

This paper investigates receive power control for multiuser inductive power transfer (IPT) systems with a single-frequency coil array. The primary task is to optimize the transmit coil currents to minimize the total input power, subject to the minimum receive powers required by individual users. Due to the complicated coupling mechanism among all transmit coils and user pickups, the optimization problem is a non-convex quadratically constrained quadratic program (QCQP), which is analytically intractable. This paper solves the problem by applying the semidefinite relaxation (SDR) technique and evaluates the performance by full-wave electromagnetic simulations. Our results show that a single-frequency coil array is capable of power control for various multiuser scenarios, assuming that the number of transmit coils is greater than or equal to the number of users and the transmission conditions for individual users are uncorrelated. key words: inductive power transfer, multiuser, single-frequency coil array, receive power control Recently, researchers are paying more attention to multiuser IPT system, where a charging platform-consisting of one or more coils-simultaneously delivers power to multiple users [10]-[12]. Users typically require different power levels for their operations, calling for efficient power control for individual users. The receive power control problem is challenging because in multiuser IPT system, the power flows are influenced by a mash-up of: (1) coupling between charging-platform and users, (2) crosscoupling among users, and (3) cross-coupling among coils in the charging-platform. A straightforward solution is to completely decouple the users by exploiting the frequencydivision technique [10]; but this approach has a drawback in Manuscript

show abstract

Beamforming for Magnetic Induction Based Wireless Power Transfer Systems with Multiple Receivers

Cited by 37 publications

References 21 publications

A Survey on Subsurface Signal Propagation

A Survey on Subsurface Signal Propagation

Alvus

Receive Power Control in Multiuser Inductive Power Transfer System Using Single-Frequency Coil Array

Contact Info

Product

Resources

About