Analysis of Efficiencies for Multiple-Input Multiple-Output Wireless Power Transfer Systems

Kim, Se-Jin; Lee, Bomson

doi:10.5515/jkiees.2016.16.2.126

Cited by 17 publications

(9 citation statements)

References 13 publications

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“…Maximum efficiency and optimal load resistance given by equations (23) and (24) matches perfectly with the formulations in [6,7,8]. Optimal load reactance determined by Eq.…”

Section: Ipt Through Air and Without Cross-couplingsupporting

confidence: 63%

“…These works showed that the efficiency increases monotonically with the number of receivers, meaning that simultaneous charing is more efficient than charging in a time division manner. As [6,7,8] optimized only resistances of the loads, these works, however, do not answer an important question that whether simultaneous resonance at the receiving coils gives the maximum efficiency. Cross-coupling among receivers is an important issue which has been investigated experimentally in literatures [9, 10, 11].…”

Section: Introductionmentioning

confidence: 99%

“…Efficiency maximization for multiple-receiver IPT is one of the most attractive topic. Solution for system with two receivers is studied in [5] and then extended in [6,7,8] for system with arbitrary number of receivers. These works showed that the efficiency increases monotonically with the number of receivers, meaning that simultaneous charing is more efficient than charging in a time division manner.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Maximum efficiency formulation for inductive power transfer with multiple receivers

Duong

Okada

2016

IEICE Electron. Express

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This paper presents closed-form expressions of optimal loads that achieve the maximum efficiency for inductive power transfer (IPT) system with multiple receivers. We model the system as a passive N-port network and jointly optimize both reactive and resistive components of the loads. The derived expression allows one to predict RF-to-RF efficiency of IPT system with any number of receivers, under any coupling condition and through any type of media.

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“…Maximum efficiency and optimal load resistance given by equations (23) and (24) matches perfectly with the formulations in [6,7,8]. Optimal load reactance determined by Eq.…”

Section: Ipt Through Air and Without Cross-couplingsupporting

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Maximum efficiency formulation for inductive power transfer with multiple receivers

Duong

Okada

2016

IEICE Electron. Express

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“…Therefore, WPT technologies have recently been developed to overcome the limitations of the wired power transfer system [4,5]. Although WPT technology can overcome the shortcomings of a wired power system, there is concern that the transmission distance poses a potential inconvenience to users [6]. Various coil systems and methods have been employed to increase the transmission distance [7,8].…”

Section: Introductionmentioning

confidence: 99%

Toroidal-Shaped Coils for a Wireless Power Transfer System for an Unmanned Aerial Vehicle

Park

Kim²,

Shin

et al. 2019

J Electromagn Eng Sci

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Unmanned aerial vehicles (UAVs) using communications, sensors, and navigation equipment will play a key role in future warfare. Currently, UAVs are monitored to prevent misfire and accidents, and the conventional method adopted uses wires for data transmission and power supply. The repeated connection and disconnection of cables increases maintenance time and harms the connector. For convenience and stability, a wireless power transfer system to power UAVs is needed. Unlike other wireless power transfer (WPT) applications, the size of the receiving coils must be small, so that the WPT systems can be embedded inside space-limited UAVs. The small size reduces the coupling coefficient and transfer efficiency between the transmitting and the receiving coils. In this study, we propose a toroidal-shaped coil for a WPT system for UAVs with high coupling coefficient with minimum space requirements. For validation, conventional coils and the proposed toroidal-shaped coil were used and their coupling coefficient and power transfer efficiency were compared using simulated and measured results. The simulated and measured results were strongly correlated, confirming that the proposed WPT system significantly improved efficiency with negligible change in the space requirement. This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. ⓒ

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“…To reduce the input imaginary power and increase the power transfer efficiency, effective compensation topologies have been introduced and analyzed in [9]. In addition, many researchers have made significant contributions in different areas, such as with a high-efficiency power source [10,11], analysis and modeling of coupling systems, [12][13][14], and optimal load [15,16].…”

Section: Introductionmentioning

confidence: 99%

An Effective Experimental Optimization Method for Wireless Power Transfer System Design Using Frequency Domain Measurement

Jeong¹,

Kim²,

Jung³

et al. 2017

J Electromagn Eng Sci

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This paper proposes an experimental optimization method for a wireless power transfer (WPT) system. The power transfer characteristics of a WPT system with arbitrary loads and various types of coupling and compensation networks can be extracted by frequency domain measurements. The various performance parameters of the WPT system, such as input real/imaginary/apparent power, power factor, efficiency, output power and voltage gain, can be accurately extracted in a frequency domain by a single passive measurement. Subsequently, the design parameters can be efficiently tuned by separating the overall design steps into two parts. The extracted performance parameters of the WPT system were validated with time-domain experiments.

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Analysis of Efficiencies for Multiple-Input Multiple-Output Wireless Power Transfer Systems

Cited by 17 publications

References 13 publications

Maximum efficiency formulation for inductive power transfer with multiple receivers

Maximum efficiency formulation for inductive power transfer with multiple receivers

Toroidal-Shaped Coils for a Wireless Power Transfer System for an Unmanned Aerial Vehicle

An Effective Experimental Optimization Method for Wireless Power Transfer System Design Using Frequency Domain Measurement

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