Enhanced Wireless Power Transmission Using Strong Paramagnetic Response

Ahn, Do-Seob; Kiani, Mehdi; Ghovanloo, Maysam

doi:10.1109/tmag.2013.2284752

Cited by 41 publications

(25 citation statements)

References 27 publications

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“…If the network delivers the maximum power to the load, then the operating power gain becomes the ideal maximum PTE. Because the operating power gain does not include the effect of the source impedance, it is incorrect for the PTE to be estimated from the operating power gain of (9), as shown in [22] and [23].…”

Section: Power Transfer Efficiency (Pte)mentioning

confidence: 99%

A Study on Two-coil and Four-coil Wireless Power Transfer System Using Z-parameter Approach

Seo¹,

Lee²,

Lee³

2016

ETRI J

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A wireless power transfer (WPT) system is usually classified as being of either a two-coil or four-coil type. It is known that two-coil WPT systems are suitable for shortrange transmissions, whereas four-coil WPT systems are suitable for mid-range transmissions. However, this paper reveals that the two aforementioned types of WPT system are alike in terms of their performance and characteristics, differing only when it comes to their matching-network configurations. In this paper, we first find the optimum load and source conditions using Z-parameters. Then, we estimate the maximum power transfer efficiency under the optimum load and source conditions, and we describe how to configure the matching networks pertaining to both types of WPT system for the given optimum load and source conditions. The two types of WPT system show the same performance with respect to the coupling coefficient and load impedance. Further, they also demonstrate an identical performance in the two cases considered in this paper, that is, a strong-coupled case and a weak-coupled case.Keywords: Four-coil wireless power transfer system, matching network, power gain, power transfer efficiency, transducer power gain, two-coil wireless power transfer system, two-port network, Z-parameter.

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Section: Power Transfer Efficiency (Pte)mentioning

confidence: 99%

A Study on Two-coil and Four-coil Wireless Power Transfer System Using Z-parameter Approach

Seo¹,

Lee²,

Lee³

2016

ETRI J

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“…The research of magnetic-resonance coupling is particularly prized in the areas of wireless power transfer (WPT) since this research was published in the US journal Science in 2007 [1]. Many interesting fields on magnetic-resonance WPT have been studied in just the last 10 years alone [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Efficiency Analysis of Multiple-Transmitter Wireless Power Transfer Systems

Jin

Wang

2018

International Journal of Antennas and Propagation

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The range of the power transmission region can be effectively enlarged by a multiple-transmitter (TXs) and single-receiver (RX) magnetic wireless power transfer (WPT) system. However, the power transfer efficiency (PTE) of the WPT system with two TXs and a single RX has been intensively studied in the past few years. Therefore, a deep analysis of multiple-TX WPT systems needs to be implemented urgently to achieve the highest PTE in a wider range of power transmission. This paper analyzes a general multiple-TX single-RX system in detail based on the circuit model. Two optimal conditions, in which the feeding amplitude ratios need be equal to the mutual inductance ratios and the optimal load should be connected to RX, are derived to obtain the highest PTE. In the experiment part, the feeding amplitude ratios for multiple TXs are implemented by a proposed lumped transformer for the first time. The use of the lumped transformer reduces the complexity compared with the use of multiple inverters to achieve predetermined feeding amplitude ratios. Multiple-TX systems are designed and measured to validate the theoretical analysis. Experimental results agree very well with theoretical calculations.

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“…Nowadays, apart from two-and four-coil WPT systems, a WPT system equipped with an increased number of coils has been studied to lengthen the transmission distance or improve the PTE [11]. Changing the operating frequency as well as the resonance frequencies of the resonators has also been studied to improve the PTE [12]- [14]. Further, the scope of studies on the WPT system has been extended from the inductive link to the various propagation links such as ultrasound, conduction, and optic links [15]- [17].…”

Section: Introductionmentioning

confidence: 99%

Method for Adjusting Single Matching Network for High-Power Transfer Efficiency of Wireless Power Transfer System

Seo¹,

Lee²,

Lee³

2016

ETRI J

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A wireless power transfer (WPT) system is generally designed with the optimum source and load impedance in order to achieve the maximum power transfer efficiency (PTE) at a specific coupling coefficient. Empirically or intuitively, however, it is well known that a high PTE can be attained by adjusting either the source or load impedance. In this paper, we estimate the maximum achievable PTE of WPT systems with the given load impedance, and propose the condition of source impedance for the maximum PTE. This condition can be reciprocally applied to the load impedance of a WPT system with the given source impedance. First, we review the transducer power gain of a two‐port network as the PTE of the WPT system. Next, we derive two candidate conditions, the critical coupling and the optimum conditions, from the transducer power gain. Finally, we compare the two conditions carefully, and the results therefore indicate that the optimum condition is more suitable for a highly efficient WPT system with a given load impedance.

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Enhanced Wireless Power Transmission Using Strong Paramagnetic Response

Cited by 41 publications

References 27 publications

A Study on Two-coil and Four-coil Wireless Power Transfer System Using Z-parameter Approach

A Study on Two-coil and Four-coil Wireless Power Transfer System Using Z-parameter Approach

Efficiency Analysis of Multiple-Transmitter Wireless Power Transfer Systems

Method for Adjusting Single Matching Network for High-Power Transfer Efficiency of Wireless Power Transfer System

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