Analytical and Experimental Investigations of Omnidirectional Wireless Power Transfer Using a Cubic Transmitter

Ha‐Van, Nam; Seo, Chulhun

doi:10.1109/tie.2017.2733470

Cited by 107 publications

(46 citation statements)

References 21 publications

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“…Energies 2019, 12, x FOR PEER REVIEW 2 of 10 work of [7], a free-positioning WPT system was proposed, but, because of the panel-structured Tx coils, the system had only two degrees of freedom; thus the efficiency will decrease dramatically with the increase of distance between Tx and Rx coil. Some Cubic Tx coils were proposed to achieve omnidirectional power transfer [8,9]. However, in the work of [8], the effect of distance was not discussed and the Rx coils were too large to be integrated in the consumer devices.…”

Section: Proposed Transmitting Coilmentioning

confidence: 99%

“…However, such a charging system is sensitive to misalignment between the charger and the device, which leads to bad user experiences. Hence, some free-positioning and omnidirectional wireless charging systems and related control methods have been proposed [4][5][6][7][8][9][10][11]. On the basis of the spherical two-or three-dimensional Tx coil, some control methods, such as current vector control, nonidentical current control, and current amplitude control, were proposed to achieve omnidirectional WPT [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…Some Cubic Tx coils were proposed to achieve omnidirectional power transfer [8,9]. However, in the work of [8], the effect of distance was not discussed and the Rx coils were too large to be integrated in the consumer devices. The size of the Tx coil in the work of [9] was also large and would lead to the space assumption in the working area.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Compact Spatial Free-Positioning Wireless Charging System for Consumer Electronics Using a Three-Dimensional Transmitting Coil

et al. 2019

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A compact spatial free-positioning wireless charging system with a novel three-dimensional (3D) transmitting (Tx) coil is proposed to charge consumer electronics in the working area. Because of the strengthened electromagnetic field generated by the proposed 3D Tx coil in the space, this system can charge consumer electronics wirelessly with great tolerance to positional and angular misalignments between the transmitter and receiver. Benefiting from the compact design of the 3D Tx coil, the system can be easily embedded in some corners of office furniture/cubic panels, which will not cause any extra working space consumption when charging devices. The inductor-capacitor-capacitor (LCC) compensation circuit on the Tx side can achieve constant current output, which is independent of load condition and can protect the transmitter. With the LCC compensation circuit, the MOSFETs of the H-bridge high-frequency inverter realized zero voltage switching (ZVS). The small-sized planar receiving (Rx) coil and series (S) compensation circuit is applied to achieve compact receiver design. The theoretical and experimental results show that the spatial free-positioning wireless charging prototype can transfer 5 W to the small-sized receiver in around 350 mm × 225 mm × 200 mm 3D charging area and achieve the highest efficiency of 77.9%.

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Section: Proposed Transmitting Coilmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Compact Spatial Free-Positioning Wireless Charging System for Consumer Electronics Using a Three-Dimensional Transmitting Coil

et al. 2019

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“…In Figure 1, the matching circuit of the system consists of a parallel capacitor and a series capacitor. The matching circuits can match the termination impedance at the resonant frequency, which will provide high PTE and better stability of the system [27][28][29]. The omnidirectional MRCWPT system can be modeled in terms of equivalent lumped circuit elements.…”

Section: Equivalent Circuit Theory Of the Omnidirectional Mrcwpt Systemmentioning

confidence: 99%

Omnidirectional Wireless Power Transfer System With Multiple Receivers and a Single Wire Wound Spiral Transmitter

Wang¹,

Deng²,

Luo³

et al. 2019

PIER C

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Last decade has witnessed dramatic advancements in wireless charging distance of magnetic resonant coupling wireless power transfer (MRCWPT) for various portable electronic devices. Driven by the demand of cost-effective and compact system working for multiple receivers, a novel omnidirectional MRCWPT system with a single wire wound spiral transmitter and a single power source is proposed in this work. Besides, an equivalent circuit model is established to derive the power transfer efficiency (PTE) of this novel MRCWPT system. Finite element simulation results have shown that the magnetic field distribution for the proposed model is uniform in all directions. And the PTE of the system depending on the distance between the transmitter and receivers is demonstrated to be independent of the receiving angles. Finally, the theoretical analysis of the simulation results is verified by practical experimental results, which shows that the PTE of the system reaches 60% at the distance of 160 mm and the resonant frequency of 15.5 MHz.

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“…It is a great revolution in the field of energy transmission and has been a research hotspot until now. At present, the research of MCR technology mainly aims at improving the energy transmission characteristics of the system, including coil and transmission structure optimization design [3][4][5] and system control [6].…”

Section: Introductionmentioning

confidence: 99%

Interference Analysis of Metal Conductors for Target-Resonance-Based Detection Method

Chen¹,

Zhang²,

Yinchun³

et al. 2020

Complexity

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Frequency bifurcation phenomenon is an important input characteristic of the magnetically coupled resonant wireless power transfer (MCR-WPT) system in overcoupling situation. In this paper, frequency bifurcation phenomenon in MCR is extended to the general transmitter-receiver coupling system, and the two main factors affecting the phenomenon are analyzed. Finally, the phenomenon is introduced into the field of signal detection, and a noncontact detection method based on target coil resonance is proposed in this paper. Since the proposed method is a kind of electromagnetic method, the detection system is highly susceptible to the surrounding metal conductors. Therefore, the detection performance of this method under three metal-environment conditions is analyzed, respectively. Simulations and experiments show that the metal barrier can weaken the detection because of the eddy current effect, but as long as the barrier does not completely isolate the two coils, the method still has strong penetrability. Besides, the metal plate placed parallel outside the transmitter has less influence on the detection when compared with the metal barrier, and the metal plate by the side of the transmitter can even enhance the detection effect. As a consequence, this method has strong stability in metal environment.

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Analytical and Experimental Investigations of Omnidirectional Wireless Power Transfer Using a Cubic Transmitter

Cited by 107 publications

References 21 publications

A Compact Spatial Free-Positioning Wireless Charging System for Consumer Electronics Using a Three-Dimensional Transmitting Coil

A Compact Spatial Free-Positioning Wireless Charging System for Consumer Electronics Using a Three-Dimensional Transmitting Coil

Omnidirectional Wireless Power Transfer System With Multiple Receivers and a Single Wire Wound Spiral Transmitter

Interference Analysis of Metal Conductors for Target-Resonance-Based Detection Method

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