Alternative Expressions for Mutual Inductance and Coupling Coefficient Applied in Wireless Power Transfer

Kim, Gunyoung; Lee, Bomson

doi:10.5515/jkiees.2016.16.2.112

Cited by 12 publications

(20 citation statements)

References 8 publications

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“…In Fig. 1, k is the coupling coefficient [10,11]. A positive k means the same magnetic flux direction crossing the Tx and Rx loops.…”

Section: Optimization Of a Miso System For Maximum Efficiencymentioning

confidence: 99%

“…A circle is located above the Tx loop where k is zero or very small. Based on the equivalent circuit analysis in [11], efficiency (η) can be expressed as…”

Section: Optimization Of a Miso System For Maximum Efficiencymentioning

confidence: 99%

“…The quality factors Q 1 (or Q 2 ) and Q 0 are 348.6 and 334.2, respectively. The coupling coefficient (k 21 ) [11] between the two Tx's is -0.0064. The minus sign implies that the magnetic flux generated from one Tx loop crosses the other in an opposite direction.…”

Section: Circuit and Electromagnetic Simulationsmentioning

confidence: 99%

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Optimization of Excitation Magnitudes and Phases for Maximum Efficiencies in a MISO Wireless Power Transfer System

Lee

Boo

Kim

et al. 2020

J Electromagn Eng Sci

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This paper presents a method for solving receiver misalignment (axial or angular) problems in wireless power transfer systems using a multiple-input single-output system. The optimum magnitudes and phases of the transmitter voltages and receiver load for maximum efficiency are derived in convenient analytical forms when negligible mutual couplings between transmitters. These solutions are validated by genetic algorithm optimization and electromagnetic-simulation results for a design ex-ample of two transmitters and one rotating receiver.

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“…In Fig. 1, k is the coupling coefficient [10,11]. A positive k means the same magnetic flux direction crossing the Tx and Rx loops.…”

Section: Optimization Of a Miso System For Maximum Efficiencymentioning

confidence: 99%

“…A circle is located above the Tx loop where k is zero or very small. Based on the equivalent circuit analysis in [11], efficiency (η) can be expressed as…”

Section: Optimization Of a Miso System For Maximum Efficiencymentioning

confidence: 99%

See 1 more Smart Citation

Optimization of Excitation Magnitudes and Phases for Maximum Efficiencies in a MISO Wireless Power Transfer System

Lee

Boo

Kim

et al. 2020

J Electromagn Eng Sci

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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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“…In indirect-fed MR-WPT systems, the Tx part consists of the source loop and the Tx coil, while the Rx part consists of the load loop and the Rx coil. Most user experiences indicate that in practical applications, it is difficult to use strongly-coupled magnetic resonance wireless charging system [2,3]. This is mainly because of the large volume of the Rx part and the spatial restrictions of the Tx and Rx coils.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Resonant Wireless Power Transfer with L-Shape Arranged Resonators for Laptop Computer

Choi¹,

Kang²,

Jung³

2017

Journal of electromagnetic engineering and science

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In this study, we designed, measured, and analyzed a rearranged L-shape magnetic resonance coupling wireless power transfer (MR-WPT) system for practical applications with laptops. The typical four resonator MR-WPT (Tx part: source loop and Tx coil; Rx part: Rx coil and load loop) is difficult to apply to small-sized stationary and mobile applications, such as laptop computers, tablet-PCs, and smartphones, owing to the large volume of the Rx part and the spatial restrictions of the Tx and Rx coils. Therefore, an L-shape structure, which is the orthogonal arrangement of the Tx and Rx parts, is proposed for indoor environment applications, such as at an Lshaped wall or desk. The relatively large Tx part and Rx coil can be installed in the wall and the desk, respectively, while the load loop is embedded in the small stationary or mobile devices. The transfer efficiency (TE) of the proposed system was measured according to the transfer distance (TD) and the misaligned locations of the load loop. In addition, we measured the TE in the active/non-active state and monitor-open/closed state of the laptop computer. The overall highest TE of the L-shape MR-WPT was 61.43% at 45 cm TD, and the TE decreased to 27.9% in the active and monitor-open state of the laptop computer. The conductive ground plane has a much higher impact on the performance when compared to the impact of the active/non-active states. We verified the characteristics and practical benefits of the proposed L-shape MR-WPT compared to the typical MR-WPT for applications to L-shaped corners.Key Words: L-Shape, Laptop Applications, Magnetic Resonance, Transfer Efficiency, Wireless Power Transfer. Manuscript received February 14, 2017 ; Revised May 24, 2017 ; Accepted June 23, 2017. (ID No. 20170214-008J) 1 Fraunhofer Heinrich-Hertz Institute, Berlin, Germany 2 Graduate School of Nano·IT·Design Fusion, Seoul National University of Science and Technology, Seoul, Korea. * Corresponding Author: Chang Won Jung (e-mail: changwoj@seoultech.ac.kr) This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. ⓒ Copyright The Korean Institute of Electromagnetic Engineering and Science. All Rights Reserved. CHOI et al.: MAGNETIC RESONANT WIRELESS POWER TRANSFER WITH L-SHAPE ARRANGED RESONATORS FOR LAPTOP COMPUTER 127In this work, we explore an L-shaped MR-WPT system for applications in "L" shaped corners, such as at a wall or a desk in an indoor environment. The Tx and Rx parts are orthogonal to each other, and hence the term "L-shape".The concept of the proposed structure is "easy application in many places". Fig. 1(a) shows the L-shape MR-WPT. The typical MR-WPT consists of four resonators. The order of arrangement of the resonators in MR-WPT does not experimentally affect the TE [4,5]. Therefore, the order of the arran...

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Alternative Expressions for Mutual Inductance and Coupling Coefficient Applied in Wireless Power Transfer

Cited by 12 publications

References 8 publications

Optimization of Excitation Magnitudes and Phases for Maximum Efficiencies in a MISO Wireless Power Transfer System

Optimization of Excitation Magnitudes and Phases for Maximum Efficiencies in a MISO Wireless Power Transfer System

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

Magnetic Resonant Wireless Power Transfer with L-Shape Arranged Resonators for Laptop Computer

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