Mathematic Analysis of Omnidirectional Wireless Power Transfer—Part-II Three-Dimensional Systems

Lin, D.; Zhang, Cheng; Hui, S. Y. Ron

doi:10.1109/tpel.2016.2523506

Cited by 116 publications

(56 citation statements)

References 10 publications

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“…Eqs. (19) and (20) are coupled differential equations in the fields amplitudes. Under the assumption that radiation losses are small, one finds thaẗ…”

Section: Appendix A: Forced Energy Cmtmentioning

confidence: 99%

An electromagnetic induced transparency-like scheme for wireless power transfer using dielectric resonators

Elnaggar

2017

Journal of Applied Physics

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Similar to the hybridization of three atoms, three coupled resonators interact to form bonding, anti-bonding and non-bonding modes. The non-bonding mode enables an electromagnetic induced transparency like transfer of energy. Here the non-bonding mode, resulting from the strong electric coupling of two dielectric resonators and an enclosure, is exploited to show that it is feasible to transfer power over a distance comparable to the operating wavelength. In this scheme, the enclosure acts as a mediator. The strong coupling permits the excitation of the non-bonding mode with high purity. This approach is different from resonant inductive coupling which works in the sub-wavelength regime. Optimal loads and the corresponding maximum efficiency are determined using two independent methods: Coupled Mode Theory and Circuit modelling. It is shown that, unlike resonant inductive coupling, the figure of merit depends on the enclosure quality and not on the load, which emphasizes the role of the enclosure as a mediator. Briefly after the input excitation is turned on, the energy in the receiver builds up via all coupled and spurious modes. As time elapses, all modes except the non-bonding cease to sustain. Due to the strong coupling between the dielectrics and the enclosure, such systems have unique properties such as high and uniform efficiency over large distances; and minimal fringing fields. These properties suggest that electromagnetic induced transparency like schemes which rely on the use of dielectric resonators can be used to power autonomous systems inside an enclosure or find applications when exposure to the fields needs to be minimal. Finite Element computations are used to verify the theoretical predictions by determining the transfer efficiency, fields profile and coupling coefficients for two different systems. It is shown that the three resonators must be present for efficient power transfer; if one or more are removed, the transfer efficiency reduces significantly.

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“…Eqs. (19) and (20) are coupled differential equations in the fields amplitudes. Under the assumption that radiation losses are small, one finds thaẗ…”

Section: Appendix A: Forced Energy Cmtmentioning

confidence: 99%

An electromagnetic induced transparency-like scheme for wireless power transfer using dielectric resonators

Elnaggar

2017

Journal of Applied Physics

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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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“…However, the wide application of the one-to-many MRCWPT system is limited in effective work range and direction at the receivers. To resolve this issue, an omnidirectional MRCWPT system is proposed [21][22][23][24][25][26]. In [21][22][23], the transmitters are made up of orthogonal coils, which require complex control methods to achieve uniform magnetic field distribution in all directions.…”

Section: Introductionmentioning

confidence: 99%

“…To resolve this issue, an omnidirectional MRCWPT system is proposed [21][22][23][24][25][26]. In [21][22][23], the transmitters are made up of orthogonal coils, which require complex control methods to achieve uniform magnetic field distribution in all directions. Another omnidirectional MRCWPT system is proposed with a simple control method by connecting orthogonal coils in parallel or series [24][25][26], but the magnetic field distribution of the transmitter in each direction is different.…”

Section: Introductionmentioning

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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Mathematic Analysis of Omnidirectional Wireless Power Transfer—Part-II Three-Dimensional Systems

Cited by 116 publications

References 10 publications

An electromagnetic induced transparency-like scheme for wireless power transfer using dielectric resonators

An electromagnetic induced transparency-like scheme for wireless power transfer using dielectric resonators

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

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

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