An increasing the power transmission efficiency of flat spiral coils by using ferrite materials for wireless power transfer applications

Santalunai, Samran; Thongsopa, Chanchai; Thosdeekoraphat, Thanaset

doi:10.1109/ecticon.2014.6839838

Cited by 16 publications

(3 citation statements)

References 15 publications

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“…To increase the power transfer efficiency, multiple coils and ferrite cores can be utilized. Previous studies [64]- [66] have indicated that employing ferrite cores in wireless links, although increasing the production costs and complexities, intensifies the electromagnetic field for a higher power transfer efficiency.…”

Section: E Future Directions For Wpt Research For Pacemakersmentioning

confidence: 99%

Coil-based Wireless Power Transfer for Implanted Pacemakers: A Brief Review

Hisan,

Sabila,

Amri

2023

Jurnal Teknik Elektro

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Nowadays, implanted permanent pacemakers (PPM) users need to undergo periodic pacemaker replacement surgery. The surgery is needed since the pacemaker's battery is usually depleted in 5-10 years. This surgery, although poses relatively low health risks, is inconvenient for PPM users. Moreover, the surgery can still be dangerous for PPM users, especially considering that most of the users are elderly. PPM replacement surgery is also costly. In addition to the costs of the surgery itself, the PPM users need to bear the price of the new PPM every time they undergo surgery. Currently, when the PPM's battery runs out, the whole PPM needs to be replaced. This is conducted to prevent the possibility of a leak in the battery seal, which might allow the body fluids to enter the PPM. Typically, once a battery is inserted into the PPM, it will be permanently sealed along with all other electronic components, and thus, battery-only replacement is impossible. Thanks to the recent advancement of wireless power transfer (WPT) technology, a PPM replacement surgery might no longer be necessary in the near future. This article presents a brief review of the current state of coil-based WPT technology and its potential applications in pacemakers. Depending on the load and transmission distance, a recent WPT system for PPM could achieve WPT efficiency as high as 97.91% on air and 78% on pig tissue medium. In terms of output power, recent works that we have summarized showed that they are able to transmit power up to 5W on a WPT system implemented on a human phantom. We also discuss the challenges, limitations, and future prospects for WPT in the medical field, particularly for PPM applications.

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Section: E Future Directions For Wpt Research For Pacemakersmentioning

confidence: 99%

Coil-based Wireless Power Transfer for Implanted Pacemakers: A Brief Review

Hisan,

Sabila,

Amri

2023

Jurnal Teknik Elektro

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“…High permeability materials, such as ferrite cores, can be used to enhance the magnetic coupling between coils, and hence the transmission efficiency is increased in long distance [17][18][19][20][21][22]. In [17], a novel configuration of a magnetic resonant structure is proposed.…”

Section: Introductionmentioning

confidence: 99%

“…By applying the proposed method, the system is capable of transferring power with the efficiency of over 90%. In [20], an optimal power transmission of flat spiral coils is presented where flat spiral coils are connected with ferrite materials. The magnetic field of the flat spiral ferrite core materials and of the flat spiral air core is analyzed and compared.…”

Section: Introductionmentioning

confidence: 99%

Study of Load Characteristics in Wireless Power Transfer System With Ferrite Core

Wang¹,

Feng²,

Shen³

et al. 2018

PIER M

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For wireless power transfer via magnetic resonant coupling (MRC-WPT), magnetic coupling between resonant coils can be greatly enhanced when a ferrite core is introduced inside the coils. Based on the equivalent circuit model of wireless power transfer system, transfer characteristics of the MRC-WPT system with air resonant coils and with a ferrite core are respectively analyzed in this paper. The influence mechanism of the load on the power transfer efficiency is investigated. Also, the requirement of load for improving transfer efficiency is derived when adding the ferrite core to the system. The numerical simulation and experiment result indicate that the transmission efficiency in the MRC-WPT system with ferrite core is higher than that in the counterpart with air resonant coils in the whole transfer region when the load is larger than the maximal critical load. In addition, for different transfer distances, the system efficiency for the system using the ferrite core tends to become lower than that in the air coil system when the load is smaller than the critical load.

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