Wireless Power Transfer for Variable Load, Distance, and Power Division Ratio in a Loosely-Coupled Multiple-Receiver Relay System

• Published in: IEEE transactions on industrial electronics (1982) Vol. 70; no. 7; pp. 6809 - 6818
• Main Authors: Cho, Jung-Hoon, Jung, Sunghun, Kim, Young-Joon
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-07-2023; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Configurations; Couplings; Display devices; Electric power distribution; Impedance; Inductance; Multiple load; multiple-receiver; multiple-relay; Power consumption; Receivers; Relay systems; Relays; Resistance; Resonators; wireless power transfer (WPT); Wireless power transmission
• ISSN: 0278-0046; 1557-9948
• DOI: 10.1109/TIE.2022.3201302

This article proposes a wireless power transfer (WPT) system for variant receiver (Rx) configuration, power distribution ratio, load, and distance with multiple relays, each of which is connected to a resistive load. Each Rx relay transfers power to an adjacent Rx and acts as a relay while its local load consumes power. We develop a methodology for the design of WPT resonators that achieve optimum efficiency for multiple receivers with power distribution ratios, loads, and distances. The WPT configuration is extended to a general m×n, two-dimensional grid for a large area coverage. A mathematical model of the proposed WPT system is provided, and a multiple-Rx wireless power network using a power inverter serves as a proof-of-concept. Following the design guidelines provided in this article, experimental examples with variable parameters while delivering a total power of 100 W are discussed. To illustrate the practical applicability of this approach, a demonstration on a consumer display and speaker device is performed.