A consideration of electro-magnetic-resonant coupling mode in wireless power transmission

Hirayama, Hiroshi; Toshiyuki, Ozawa; Hiraiwa, Yosuke; Kikuma, Nobuyoshi; Sakakibara, Kunio

doi:10.1587/elex.6.1421

Cited by 32 publications

(17 citation statements)

References 1 publication

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“…This fact is consistent with the consideration of port currents and near-field distribution in the reference [2]. For the even mode, the self inductance and the mutual inductance is substituted because of the opposite polarity, then the resonant frequency becomes higher than the f 0 .…”

Section: Consideration Modelsupporting

confidence: 85%

“…We have unveiled an mechanism of electro-magnetic resonant mode [2]. In the reference [1], it is stated that there are two resonant frequencies in the electro-magnetic resonance.…”

Section: Introductionmentioning

confidence: 93%

“…In the reference [1], it is stated that there are two resonant frequencies in the electro-magnetic resonance. In our previous work [2], we have demonstrated that the two resonant mode can be understood as an equivalent small electrical dipoles, in which the two resonant modes has opposite polarity. We referred the lower frequency resonant mode as 'odd mode' and the higher frequency resonant mode as 'even mode'.…”

Section: Introductionmentioning

confidence: 98%

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An consideration on equivalent circuit of wireless power transmission

Hirayama

Okuyama

Kikuma

et al. 2010

2010 14th International Symposium on Antenna Technology and Applied Electromagnetics &Amp; The American Electromagnetics Confer

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An equivalent circuit of wireless power transmission is discussed. We demonstrate that an input impedance of the wireless power transmission is expressed by a simple equivalent circuit. The equivalent circuit spells out how the resonant frequency is determined. The parameters in the equivalent circuit is found by using genetic algorithm so that the input impedance calculated by method of moment (MoM) agreed with one calculated by the equivalent circuit. The equivalent circuit expression will provide analytical approach of consideration on power transmission efficiency.

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Section: Consideration Modelsupporting

confidence: 85%

“…We have unveiled an mechanism of electro-magnetic resonant mode [2]. In the reference [1], it is stated that there are two resonant frequencies in the electro-magnetic resonance.…”

Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

An consideration on equivalent circuit of wireless power transmission

Hirayama

Okuyama

Kikuma

et al. 2010

2010 14th International Symposium on Antenna Technology and Applied Electromagnetics &Amp; The American Electromagnetics Confer

Self Cite

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“…In [9], we investigated the applicability of the quasistatic approximation for SAR calculations for a WPT system that consisted of two identical perfectly electrically conducting helical coils [11]. The system operates in the 10 MHz band, which is the highest frequency band considered for magnetic-resonance WPT systems.…”

Section: Assessment Of Human Exposurementioning

confidence: 99%

Quasistatic Approximation for Exposure Assessment of Wireless Power Transfer

Laakso

Shimamoto

Hirata

et al. 2015

IEICE Trans. Commun.

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SUMMARY Magnetic resonant coupling between two coils allows effective wireless transfer of power over distances in the range of tens of centimeters to a few meters. The strong resonant magnetic field also extends to the immediate surroundings of the power transfer system. When a user or bystander is exposed to this magnetic field, electric fields are induced in the body. For the purposes of human and product safety, it is necessary to evaluate whether these fields satisfy the human exposure limits specified in international guidelines and standards. This work investigates the effectiveness of the quasistatic approximation for computational modeling human exposure to the magnetic fields of wireless power transfer systems. It is shown that, when valid, this approximation can greatly reduce the computational requirements of the assessment of human exposure. Using the quasistatic modeling approach, we present an example of the assessment of human exposure to the non-uniform magnetic field of a realistic WPT system for wireless charging of an electric vehicle battery, and propose a coupling factor for practical determination of compliance with the international exposure standards. key words: wireless power transfer, human exposure, dosimetry

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“…Our focus here is to compare the dosimetry of the two resonant modes in the HR-WPT system. The related foundational studies were conducted in [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Two Resonant Modes for Highly Resonant Wireless Power Transfer and Specific Absorption Rate

Park

2016

PIER C

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Abstract-In this work, the dosimetry for two resonant modes of a highly resonant wireless power transfer (HR-WPT) system is investigated, and the results are compared. The physical mechanism of the two resonant modes, which occur when the two transmitting and receiving resonators are extremely close to one another, is presented with the simulated results and the equivalent circuit models for the HR-WPT system. The difference between the two resonant modes for the specific absorption rate induced in the head model is discussed by comparing the electromagnetic fields for each mode. Furthermore, the dosimetry for the four-coil HR-WPT system is also investigated under the conditions of a single resonant mode and two resonant modes. The specific absorption rates (SARs) are calculated with head-size and body-size simplified human models at various distances from the WPT system and in each mode. The electric and magnetic fields of the odd mode show stronger distribution than those of the even mode in the area near to the WPT system, while the opposite results are found in the area farther away.

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A consideration of electro-magnetic-resonant coupling mode in wireless power transmission

Cited by 32 publications

References 1 publication

An consideration on equivalent circuit of wireless power transmission

An consideration on equivalent circuit of wireless power transmission

Quasistatic Approximation for Exposure Assessment of Wireless Power Transfer

Mechanism of Two Resonant Modes for Highly Resonant Wireless Power Transfer and Specific Absorption Rate

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