Wireless power transfer using weakly coupled magnetostatic resonators

Mur-Miranda, José Oscar; Fanti, Giulia; Feng, Yifei; Omanakuttan, Keerthik; Ongie, Roydan; Setjoadi, Albert; Sharpe, Natalie

doi:10.1109/ecce.2010.5617728

Cited by 134 publications

(55 citation statements)

References 3 publications

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“…A major reason is the exponential reduction of the energy efficiency with the transmission distance of a WPT system. This issue was already pointed out in 1937 [12] and has also been reiterated recently in [13] and [14]. As stated by Tesla, (i) high frequency operation, (ii) low winding resistance and (iii) resonance operation are needed for efficient WPT.…”

Section: A Short-range Applications Based On Magnetic Resonancementioning

confidence: 90%

Magnetic Resonance for Wireless Power Transfer [A Look Back]

Hui

2016

IEEE Power Electron. Mag.

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Abstract:Magnetic resonance has been a cornerstone of non-radiative wireless power transfer (WPT) since the late 19 th century. Yet, there has been a misconception among some researchers who think magnetic resonance for WPT was developed recently. This article traces some early work of Tesla and other researchers related to the use of magnetic resonance in WPT. Some examples of magnetic resonance based WPT projects conducted by researchers in the biomedical and power electronics communities over last few decades are included. The article re-iterates two principles used in WPT and addresses their advantages and disadvantages. Some issues that may affect future trends of short-range and mid-range applications are addressed.

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Section: A Short-range Applications Based On Magnetic Resonancementioning

confidence: 90%

Magnetic Resonance for Wireless Power Transfer [A Look Back]

Hui

2016

IEEE Power Electron. Mag.

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“…In the following, we will derive the energy transfer probability and the average received power based on (5).…”

Section: /2mentioning

confidence: 99%

“…Nevertheless, the near field WET is not appropriate for mobile and remote devices. The reasons are two folds: first, the power strength of the near field WET will be dramatically degraded with the increasing transmission distance [5]; second, the near field WET needs aligned induction coils or resonators at transmitters and receivers. In contrast, by capturing RF radiation and converting it into a direct current (DC), RF WET, which is regarded as a far-field energy transfer technique, can provide service to mobile and remote devices.…”

mentioning

confidence: 99%

Online Power and Time Allocation in MIMO Uplink Transmissions Powered by RF Wireless Energy Transfer

Liang

Zhao

Yang

et al. 2017

IEEE Trans. Veh. Technol.

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Abstract-Wireless energy transfer (WET) has been a promising technology to tackle the lifetime bottlenecks of energy-limited wireless devices in recent years. In this paper, we study a WET enabled multiple input multiple output (MIMO) system including a base station (BS) and a user equipment (UE), which has a finite battery capacity. We consider slotted transmissions, where each slot includes two phases, namely downlink (DL) WET phase and uplink (UL) wireless information transmission (WIT) phase. In the WET phase (a fraction τ of a slot), the BS transfers energy and the UE stores the received energy in the battery. In the WIT phase (a fraction 1 − τ of a slot), the UE transmits information to the BS by using the energy in the battery. Considering the power sensitivity α of the radio frequency (RF) to direct current (DC) conversion circuits, the BS transfers energy only if the UE received power is larger than α, and the downlink WET is formulated as a Bernoulli process. Based on the formulation, we propose an online power and time allocation algorithm to maximize the average data rate of uplink WIT. We also extend the proposed algorithm to multiple user systems. The numerical results show that the proposed algorithm outperforms the existing schemes in terms of average data rate, energy efficiency and outage probability.Index Terms-WET, MIMO, online power and time allocation, finite battery size.

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“…It was found that a power loss is inversely proportional to the product of kQ, indicating that the energy efficiency η is proportional to the kQ product. 27,28 For the WPT system with two coils, we have…”

Section: Magnetic Properties Analysismentioning

confidence: 99%

Magnetic shielding structure optimization design for wireless power transmission coil

et al. 2017

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In order to improve the performance of the wireless power transmission (WPT) system, a novel design scheme with magnetic shielding structure on the WPT coil is presented in this paper. This new type of shielding structure has great advantages on magnetic flux leakage reduction and magnetic field concentration. On the basis of theoretical calculation of coil magnetic flux linkage and characteristic analysis as well as practical application feasibility consideration, a complete magnetic shielding structure was designed and the whole design procedure was represented in detail. The simulation results show that the coil with the designed shielding structure has the maximum energy transmission efficiency. Compared with the traditional shielding structure, the weight of the new design is significantly decreased by about 41%. Finally, according to the designed shielding structure, the corresponding experiment platform is built to verify the correctness and superiority of the proposed scheme.

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Wireless power transfer using weakly coupled magnetostatic resonators

Cited by 134 publications

References 3 publications

Magnetic Resonance for Wireless Power Transfer [A Look Back]

Magnetic Resonance for Wireless Power Transfer [A Look Back]

Online Power and Time Allocation in MIMO Uplink Transmissions Powered by RF Wireless Energy Transfer

Magnetic shielding structure optimization design for wireless power transmission coil

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