Magnetic Resonant Coupling As a Potential Means for Wireless Power Transfer to Multiple Small Receivers

Cannon, Barry; Hoburg, James F.; Stancil, Daniel D.; Goldstein, Seth Copen

doi:10.1109/tpel.2009.2017195

Cited by 807 publications

(348 citation statements)

References 5 publications

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“…The WPT technique is expected to be useful for various applications such as cellular phones, laptop computers, home electrical appliances, and electric vehicles [2][3][4][5][6]. The convenience of power transfer in this manner is analogous to the difference between wireless and wired communication.…”

Section: Introductionmentioning

confidence: 99%

Misaligned Effect and Exposure Assessment for Wireless Power Transfer System Using the Anatomical Whole-Body Human Model

Park

2017

PIER C

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Abstract-This paper presents dosimetry of a high resonance wireless power transfer (HR-WPT) system when the transmitter and receiver are aligned and misaligned. An HR-WPT system with two resonant coils and two feeding loops, operating at 13.56 MHz is designed. The power transfer efficiency of the system, and the electric and magnetic fields are investigated using the method of moments. The power transfer efficiency in misalignment situations can be increased by matching the HR-WPT system. Dosimetry of the HR-WPT system is conducted at the optimum matching condition for alignment and misalignment, to achieve the best power transfer efficiency. The specific absorption rate (SAR) is computed using a two-step approach. In the first step, the magnetic fields generated by the HR-WPT system in the absence of a whole-body voxel human model are calculated using the method of moments. In the second step, the SAR in the human model is calculated using the impedance method, with the magnetic fields computed in the previous step regarded as the magnetic fields incident to the human body. Five exposure scenarios are set: one alignment condition and four misalignment conditions. The SAR computed for the alignment and misalignment cases in the matching condition are compared to each other. The compliance of the system is also investigated using the international safety guidelines. Finally, the maximum allowable powers to comply with the guideline are investigated for the five cases considered. The results show that the SARs observed in the misalignment case are higher than those in the alignment case. These results suggest that the misalignment situation should be considered in addition to alignment, when conducting dosimetry of the HR-WPT system.

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Section: Introductionmentioning

confidence: 99%

Misaligned Effect and Exposure Assessment for Wireless Power Transfer System Using the Anatomical Whole-Body Human Model

Park

2017

PIER C

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“…The nonzero reflected reactance is an important characteristic that should be taken into account during the design of the compensation circuit at the transmitter side. On the other hand, the power transmitted to the receiver is the power dissipated into the real part given in Equation (8), which reaches a maximum at fully-tuned condition. The maximum power delivered is written as [12]:…”

Section: Principles Of Parallel-compensated Wpt Receiversmentioning

confidence: 99%

Insights into Dynamic Tuning of Magnetic-Resonant Wireless Power Transfer Receivers Based on Switch-Mode Gyrators

Saad

Alarcón

2018

Energies

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Magnetic-resonant wireless power transfer (WPT) has become a reliable contactless source of power for a wide range of applications. WPT spans different power levels ranging from low-power implantable devices up to high-power electric vehicles (EV) battery charging. The transmission range and efficiency of WPT have been reasonably enhanced by resonating the transmitter and receiver coils at a common frequency. Nevertheless, matching between resonance in the transmitter and receiver is quite cumbersome, particularly in single-transmitter multi-receiver systems. The resonance frequency in transmitter and receiver tank circuits has to be perfectly matched, otherwise power transfer capability is greatly degraded. This paper discusses the mistuning effect of parallel-compensated receivers, and thereof a novel dynamic frequency tuning method and related circuit topology and control is proposed and characterized in the system application. The proposed method is based on the concept of switch-mode gyrator emulating variable lossless inductors oriented to enable self-tunability in WPT receivers.

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“…Among the listed methods, inductive power transfer is very popular and has been used for various applications [2]. This method is well known and the has been well applied for decades [3]. The mentioned technology has been applied to charge electric vehicles, electric toothbrushes, mobile devices, and implanted devices applications [4,5].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Analysis of Different Geometry of Transmitting Coils for Wireless Power Transmission Applications

Haerinia¹,

Mosallanejad²,

Afjei³

2016

PIER M

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Abstract-Inductive power transfer is recently a common method for transferring power. This technology is developing as the modern technologies need to get more efficient and updated. The power transfer efficiency has potential to get better. There are different ways to achieve a desirable efficiency. In this paper, a suitable geometry of a coil for transferring power as a transmitting coil is examined. In this work, three types of geometries are designed. Frequency analysis at frequency range (10 kHz-50 kHz) is done to investigate behaviour of various geometries. Magnetic field, electric field, magnetic flux density, and current density for various geometries are presented and compared. Magnetic flux density is measured via an experimental setup and is compared to simulated one to verify the validity of simulation results.

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Magnetic Resonant Coupling As a Potential Means for Wireless Power Transfer to Multiple Small Receivers

Cited by 807 publications

References 5 publications

Misaligned Effect and Exposure Assessment for Wireless Power Transfer System Using the Anatomical Whole-Body Human Model

Misaligned Effect and Exposure Assessment for Wireless Power Transfer System Using the Anatomical Whole-Body Human Model

Insights into Dynamic Tuning of Magnetic-Resonant Wireless Power Transfer Receivers Based on Switch-Mode Gyrators

Electromagnetic Analysis of Different Geometry of Transmitting Coils for Wireless Power Transmission Applications

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