Orientation insensitive power transfer by magnetic resonance for mobile devices

Jonah, Olutola; Georgakopoulos, Stavros V.; Tentzeris, Manos M.

doi:10.1109/wpt.2013.6556868

Cited by 77 publications

(38 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In order to enhance the transmission efficiency, many ways had been proposed by the researchers around the world, such as introducing the intermediate resonant coils, 9 optimizing the structure and parameters of the coils, 10 etc. In Ref.…”

Section: Introductionmentioning

confidence: 99%

Transmission efficiency analysis and optimization of magnetically coupled resonant wireless power transfer system with misalignments

et al. 2018

View full text Add to dashboard Cite

Magnetically coupled resonant (MCR) wireless power transfer (WPT) is a promising technology, which has been widely used in many practical applications. In the practical application environment the misalignments between the transmitting coil and the receiving coil can not be avoided, and it will cause a rapid decline in transmission efficiency. So the misalignments have limited the applications of MCR-WPT technology in many fields. The mathematical formula of transmission efficiency with angular misalignment and lateral misalignment was deduced. And the effects of angular misalignment and lateral misalignment on the transmission efficiency were researched by simulation experiments. And the changing regularity of the transmission efficiency with the change of the angular misalignment and lateral misalignment was obtained. The results show that when there is an angular misalignment between the transmitting coil and the receiving coil, the transmission efficiency can be optimized by adjusting the lateral misalignment between the coils. And when there is a lateral misalignment between the coils, the transmission efficiency can be optimized by adjusting the angular misalignment between the coils. An experimental prototype of MCR-WPT system was built, and experiments had been carried out to evaluate the accuracy of the theoretical analysis. Therefore, the study in this paper lay a theoretical foundation for the analysis of WPT in the complex environment, and also provide a useful reference for the design of WPT system.

show abstract

Section: Introductionmentioning

confidence: 99%

Transmission efficiency analysis and optimization of magnetically coupled resonant wireless power transfer system with misalignments

et al. 2018

View full text Add to dashboard Cite

show abstract

“…The formula enables the design of coils for a defined maximum degree of elevation and azimuth misalignments. An alternative empirical approach by Jonah et al [60] presented an added degree of rotational misalignment tolerance. The work presented designs for midrange links consisting of loops with orthogonal orientations.…”

Section: Range Insensitivity and Misalignment Tolerancementioning

confidence: 99%

“…insensitivity. Transmit and receive loops consisting of (a) two and (b) three orthogonal loops [60]. …”

Section: Range Insensitivity and Misalignment Tolerancementioning

confidence: 99%

Wireless Nonradiative Energy Transfer: Antenna performance enhancement techniques

Eteng

Rahim

Leow

2015

IEEE Antennas Propag. Mag.

View full text Add to dashboard Cite

I n recent times, wireless nonradiative energy transfer has elicited considerable research interest. Its varied applications range from contactless battery charging and power delivery to sensors, near-field communications, and radio-frequency identification (RFID). Antenna performance plays a key role in the successful deployment of a wireless energy transfer strategy. This article presents an integrated survey of metrics and methods that have been employed to evaluate and improve antenna performance in nonradiative energy transfer schemes. Wireless NoNradiative eNergy traNsferWireless nonradiative energy transfer is a rapidly developing area of research interest. The application of this technology ranges from RFID systems [1], [2] and near-field communication networks [3], [4] to wireless charging [5]-[7], and wireless power delivery to biomedical sensor implants [8], [9]. Despite the recent attention given to this area, the concept has its origins in the past century. Some of the earliest well-known experimentation on the transmission of energy without wires was successfully carried out by Tesla, who focused on nonradiative transmission mechanisms. Although radiative techniques birthed modern wireless radio, not much interest was elicited by the proven nonradiative methods until quite recently [10].Nonradiative energy transfer is facilitated within the nearfield regions of electromagnetic sources, which, typically, are frequency dependent and located within a distance d 2 1 m r h from the source, where m is the wavelength [11]. The spatial range within which energy transfer is possible is typically short and comparable with the dimensions of the electromagnetic source. Energy exchange is more efficient when both the electromagnetic source and receiver share the same resonance frequency, as less energy is dissipated on nonresonant objects within the vicinity [12]. Consequently, the source and receiving electromagnetic terminals are sometimes referred to as resonators [4].Antenna theory reveals the presence of a reactive near-field region in close proximity to the surface of an antenna and a radiative near-field region in the transition zone between the near-and far-field regions [13]. Wireless nonradiative energy transfer primarily occurs in the reactive near-field region, where the electric and magnetic fields of an antenna are uncoupled and nonpropagating. Although the energy in any of these fields can be utilized, using the magnetic field ensures a lower interaction of the system with extraneous objects [12]. This requires the use of antennas that predominantly excite the TE 10 mode to enable the coupling of magnetic fields [14], [15]. Hence, in the literature, there is a preponderance of the use of spirals, helixes, coils, and other loop-inspired antenna geometries.Antennas used in wireless nonradiative applications require a different set of performance metrics than typical antennas for radiative applications. First, high radiation efficiency is not required to prevent eavesdropping in data-centric applicat...

show abstract

“…그러나 집전 측 기기의 자세가 집 전 성능에 크게 영향을 미치는 문제점을 안고 있다 [9]- [11]. 이런 문제점은 다수의 코일을 두어 해결할 수 있다 [11]- [13]. [11]에서는 1차에 직교하는 3개의 코일에 다른 주 파수의 교류를 가하고 2차에는 동일한 평면에 3개의 코일을 두는 방법이 제안되었고, [12]에서는 1차에는 하나의 코일만 두고 2차에는 직교하는 세 개의 코일을 두고 각 코일에는 별도의 정류장치를 두어 정류한 후 직렬 또는 병렬로 연결 하였다.…”

Section: 서 론unclassified

“…[11]에서는 1차에 직교하는 3개의 코일에 다른 주 파수의 교류를 가하고 2차에는 동일한 평면에 3개의 코일을 두는 방법이 제안되었고, [12]에서는 1차에는 하나의 코일만 두고 2차에는 직교하는 세 개의 코일을 두고 각 코일에는 별도의 정류장치를 두어 정류한 후 직렬 또는 병렬로 연결 하였다. [13] …”

Section: 서 론unclassified

Wireless Power Transfer System Insensitive to Pickup's Posture

Lee¹,

Lim²

2014

The Transactions of The Korean Institute of Electrical Engineer

View full text Add to dashboard Cite

-Recently, wireless power transfer (WPT) system is widely studied. WPT system is very attractive because it removes power cables from home appliances, office equipment and battery chargers for electric vehicle. However, pickup' s posture affects the performance greatly. In this paper a new pickup system whose output voltage is less sensitive to its posture is proposed. The proposed pickup system is composed of three coils perpendicular to each other. A prototype is constructed and tested, and its usefulness is verified.

show abstract

Orientation insensitive power transfer by magnetic resonance for mobile devices

Cited by 77 publications

References 16 publications

Transmission efficiency analysis and optimization of magnetically coupled resonant wireless power transfer system with misalignments

Transmission efficiency analysis and optimization of magnetically coupled resonant wireless power transfer system with misalignments

Wireless Nonradiative Energy Transfer: Antenna performance enhancement techniques

Wireless Power Transfer System Insensitive to Pickup's Posture

Contact Info

Product

Resources

About