Experimental verification of impedance matching method for repeater to improve spatial freedom of 6.78 MHz resonant inductive coupling wireless power transfer systems

Keita Fujiki; Masataka Ishihara; Kazuhiro Umetani; Eiji Hiraki

doi:10.23919/EPE.2019.8915171

Experimental verification of impedance matching method for repeater to improve spatial freedom of 6.78 MHz resonant inductive coupling wireless power transfer systems

Keita Fujiki, Masataka Ishihara, Kazuhiro Umetani, Eiji Hiraki

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

Placing a repeater, which relays the magnetic field from the transmitter to the receiver, is promising as a method to increase the spatial freedom of resonant inductive coupling wireless power transfer systems (RIC-WPT) working at 6.78MHz. However, the capability of the repeater is often affected by a frequency splitting phenomenon. When this phenomenon occurs, the resonance in the repeater becomes sufficiently small at a fixed operating frequency and make it difficult to improve the spatial freedom. To solve this problem, we apply an impedance matching method using simple switching circuits to the 6.78 RIC-WPT system with the repeater. Then we carry out experiments to verify the effectiveness of the impedance matching method. The experimental results show that the repeater improves the spatial freedom of the 6.78 MHz RIC-WPT regardless of the frequency splitting phenomenon.

Original language	English
Title of host publication	2019 21st European Conference on Power Electronics and Applications, EPE 2019 ECCE Europe
Publisher	Institute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)	9789075815313
DOIs	https://doi.org/10.23919/EPE.2019.8915171
Publication status	Published - Sep 2019
Event	21st European Conference on Power Electronics and Applications, EPE 2019 ECCE Europe - Genova, Italy Duration: Sep 3 2019 → Sep 5 2019

Publication series

Name	2019 21st European Conference on Power Electronics and Applications, EPE 2019 ECCE Europe

Conference

Conference	21st European Conference on Power Electronics and Applications, EPE 2019 ECCE Europe
Country	Italy
City	Genova
Period	9/3/19 → 9/5/19

Keywords

Contactless Energy Transfer
Gallium Nitride (GaN)
Wireless power transmission

ASJC Scopus subject areas

Mechanical Engineering
Electronic, Optical and Magnetic Materials
Control and Optimization
Energy Engineering and Power Technology
Electrical and Electronic Engineering

Access to Document

10.23919/EPE.2019.8915171

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Fujiki, K., Ishihara, M., Umetani, K., & Hiraki, E. (2019). Experimental verification of impedance matching method for repeater to improve spatial freedom of 6.78 MHz resonant inductive coupling wireless power transfer systems. In 2019 21st European Conference on Power Electronics and Applications, EPE 2019 ECCE Europe [8915171] (2019 21st European Conference on Power Electronics and Applications, EPE 2019 ECCE Europe). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.23919/EPE.2019.8915171

Experimental verification of impedance matching method for repeater to improve spatial freedom of 6.78 MHz resonant inductive coupling wireless power transfer systems. / Fujiki, Keita; Ishihara, Masataka; Umetani, Kazuhiro ; Hiraki, Eiji.

2019 21st European Conference on Power Electronics and Applications, EPE 2019 ECCE Europe. Institute of Electrical and Electronics Engineers Inc., 2019. 8915171 (2019 21st European Conference on Power Electronics and Applications, EPE 2019 ECCE Europe).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Fujiki, K, Ishihara, M, Umetani, K & Hiraki, E 2019, Experimental verification of impedance matching method for repeater to improve spatial freedom of 6.78 MHz resonant inductive coupling wireless power transfer systems. in 2019 21st European Conference on Power Electronics and Applications, EPE 2019 ECCE Europe., 8915171, 2019 21st European Conference on Power Electronics and Applications, EPE 2019 ECCE Europe, Institute of Electrical and Electronics Engineers Inc., 21st European Conference on Power Electronics and Applications, EPE 2019 ECCE Europe, Genova, Italy, 9/3/19. https://doi.org/10.23919/EPE.2019.8915171

Fujiki K, Ishihara M, Umetani K , Hiraki E. Experimental verification of impedance matching method for repeater to improve spatial freedom of 6.78 MHz resonant inductive coupling wireless power transfer systems. In 2019 21st European Conference on Power Electronics and Applications, EPE 2019 ECCE Europe. Institute of Electrical and Electronics Engineers Inc. 2019. 8915171. (2019 21st European Conference on Power Electronics and Applications, EPE 2019 ECCE Europe). https://doi.org/10.23919/EPE.2019.8915171

Fujiki, Keita ; Ishihara, Masataka ; Umetani, Kazuhiro ; Hiraki, Eiji. / Experimental verification of impedance matching method for repeater to improve spatial freedom of 6.78 MHz resonant inductive coupling wireless power transfer systems. 2019 21st European Conference on Power Electronics and Applications, EPE 2019 ECCE Europe. Institute of Electrical and Electronics Engineers Inc., 2019. (2019 21st European Conference on Power Electronics and Applications, EPE 2019 ECCE Europe).

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abstract = "Placing a repeater, which relays the magnetic field from the transmitter to the receiver, is promising as a method to increase the spatial freedom of resonant inductive coupling wireless power transfer systems (RIC-WPT) working at 6.78MHz. However, the capability of the repeater is often affected by a frequency splitting phenomenon. When this phenomenon occurs, the resonance in the repeater becomes sufficiently small at a fixed operating frequency and make it difficult to improve the spatial freedom. To solve this problem, we apply an impedance matching method using simple switching circuits to the 6.78 RIC-WPT system with the repeater. Then we carry out experiments to verify the effectiveness of the impedance matching method. The experimental results show that the repeater improves the spatial freedom of the 6.78 MHz RIC-WPT regardless of the frequency splitting phenomenon.",

keywords = "Contactless Energy Transfer, Gallium Nitride (GaN), Wireless power transmission",

author = "Keita Fujiki and Masataka Ishihara and Kazuhiro Umetani and Eiji Hiraki",

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AU - Hiraki, Eiji

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N2 - Placing a repeater, which relays the magnetic field from the transmitter to the receiver, is promising as a method to increase the spatial freedom of resonant inductive coupling wireless power transfer systems (RIC-WPT) working at 6.78MHz. However, the capability of the repeater is often affected by a frequency splitting phenomenon. When this phenomenon occurs, the resonance in the repeater becomes sufficiently small at a fixed operating frequency and make it difficult to improve the spatial freedom. To solve this problem, we apply an impedance matching method using simple switching circuits to the 6.78 RIC-WPT system with the repeater. Then we carry out experiments to verify the effectiveness of the impedance matching method. The experimental results show that the repeater improves the spatial freedom of the 6.78 MHz RIC-WPT regardless of the frequency splitting phenomenon.

AB - Placing a repeater, which relays the magnetic field from the transmitter to the receiver, is promising as a method to increase the spatial freedom of resonant inductive coupling wireless power transfer systems (RIC-WPT) working at 6.78MHz. However, the capability of the repeater is often affected by a frequency splitting phenomenon. When this phenomenon occurs, the resonance in the repeater becomes sufficiently small at a fixed operating frequency and make it difficult to improve the spatial freedom. To solve this problem, we apply an impedance matching method using simple switching circuits to the 6.78 RIC-WPT system with the repeater. Then we carry out experiments to verify the effectiveness of the impedance matching method. The experimental results show that the repeater improves the spatial freedom of the 6.78 MHz RIC-WPT regardless of the frequency splitting phenomenon.

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KW - Gallium Nitride (GaN)

KW - Wireless power transmission

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