Position-Insensitive Wireless Power Transfer Based on Nonlinear Resonant Circuits

Abdelatty, Omar; Wang, Xiaoyu; Mortazawi, Amir

doi:10.1109/tmtt.2019.2904233

Cited by 51 publications

(38 citation statements)

References 33 publications

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“…This paper also found that energy transmission in the vicinities of higher resonance frequencies under non-linearities had good stability. Figure 4 in Reference [32] was consistent with the calculated results shown in Figures 6 and 9, and hard or soft jump phenomena occurred in the WPT system. Comparing the analyses and discussions in Reference [32], this paper used more analysis methods from non-linear dynamics theory to describe non-linear resonances in the WPT system.…”

Section: Discussionsupporting

confidence: 87%

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Frequency Splitting and Transmission Characteristics of MCR-WPT System Considering Non-Linearities of Compensation Capacitors

Liu

Wang

et al. 2020

Electronics

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The frequency splitting phenomenon and transmission characteristics have been research hotspots in the field of magnetically coupled resonance wireless power transfer (MCR-WPT). In this paper, non-linear dynamics theory was innovatively introduced into the research, and non-linear coupled transmission dynamics modelling of the MCR-WPT system was established considering the non-linearities of the compensation capacitor. The mechanism of the frequency splitting phenomenon of the MCR-WPT system was revealed through systematic mathematical analyses based on the modelling. The analysis results showed that the system usually has dual natural frequencies which are low resonance frequency and high resonance frequency. Based on non-linear dynamics theory, the transmission characteristics of the system with different non-linear parameters were discussed comprehensively in relation to the modelling. The results of the numerical simulations and theoretical analyses showed that non-linear parameters can cause the jumping phenomena with the output responses, and the output responses in the vicinities of the lower resonance frequencies were extremely sensitive to changes in the coupling coefficient. According to analyses of the linear and non-linear systems, the energy transmissions performed in the vicinity of the high resonance frequency had a wider working frequency band and a better transmission stability under non-linear conditions.

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Section: Discussionsupporting

confidence: 87%

“…The MCR-WPT system with a class E inverter was studied in Reference [31], and the ON-OFF state of a switch creates a non-linearity. The WPT system with a non-linear capacitor was proposed in Reference [32]. Non-linear resonances were analyzed, and the system can maintain a high-power transfer efficiency under the non-linearity.…”

Section: Discussionmentioning

confidence: 99%

Frequency Splitting and Transmission Characteristics of MCR-WPT System Considering Non-Linearities of Compensation Capacitors

Liu

Wang

et al. 2020

Electronics

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“…A major limitation of conventional WPT systems is their sensitivity to misalignment 5 , 6 , 24 , 25 . In Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Sensitivity to misalignment effects 5 , 6 , 24 , 25 is a major issue in WPT systems including the inductively coupled one. Misalignment is caused by the change of vertical separation between transmitter (TX) and receiver (RX), lateral shift between their axes, angular change from their axes, or a combination of these types.…”

Section: Introductionmentioning

confidence: 99%

Wireless power transfer system rigid to tissue characteristics using metamaterial inspired geometry for biomedical implant applications

Pokharel

Barakat

Alshhawy

et al. 2021

Sci Rep

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Conventional resonant inductive coupling wireless power transfer (WPT) systems encounter performance degradation while energizing biomedical implants. This degradation results from the dielectric and conductive characteristics of the tissue, which cause increased radiation and conduction losses, respectively. Moreover, the proximity of a resonator to the high permittivity tissue causes a change in its operating frequency if misalignment occurs. In this report, we propose a metamaterial inspired geometry with near-zero permeability property to overcome these mentioned problems. This metamaterial inspired geometry is stacked split ring resonator metamaterial fed by a driving inductive loop and acts as a WPT transmitter for an in-tissue implanted WPT receiver. The presented demonstrations have confirmed that the proposed metamaterial inspired WPT system outperforms the conventional one. Also, the resonance frequency of the proposed metamaterial inspired TX is negligibly affected by the tissue characteristics, which is of great interest from the design and operation prospects. Furthermore, the proposed WPT system can be used with more than twice the input power of the conventional one while complying with the safety regulations of electromagnetic waves exposure.

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“…As well known, the mutual coupling between transmitting and receiving coils varies due to the change of transfer distance. To reduce sensitivity, a novel MC-WPT system based on a nonlinear resonant circuit is proposed in [32]. It is found that the transfer efficiency is still kept at high value when the distance between coils varies.…”

Section: Introductionmentioning

confidence: 99%

Analysis of a Nonlinear Magnetic Coupling Wireless Power Transfer System

Wang¹,

Ren²,

Shi³

et al. 2021

PIER C

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In near-field energy transmission, it has been proved that magnetic coupling wireless power transfer (MC-WPT) is a promising energy transmission method. Traditionally, the MC-WPT system is established based on a linear resonant circuit. Recently, it has been reported that nonlinear MC-WPT system shows more advantages. However, nonlinear characteristics of the nonlinear MC-WPT system are not fully recovered. In this paper, a nonlinear MC-WPT system which can be described by Duffing equation is presented. The mathematical model of the equivalent circuit is developed. The related nonlinear characteristics under the impact of driving force are investigated. It is found that the driving force has a direct impact on the system performance. The operation of the nonlinear MC-WPT system varies from periodic sinusoidal state to periodic non-sinusoidal state even to chaotic state when the driving force increases. It should be mentioned that the chaotic state should be avoided. Generally, the MC-WPT system should be operated in periodic sinusoidal state which only covers a small range of driving force. For the system operated in periodic non-sinusoidal state, a waveform correcting circuit is designed. The simulated and experimental results show that the restriction of the driving force on the operation of the system is eliminated with a waveform correcting circuit added. It is possible for the nonlinear MC-WPT system to be operated in a much wider range.

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Position-Insensitive Wireless Power Transfer Based on Nonlinear Resonant Circuits

Cited by 51 publications

References 33 publications

Frequency Splitting and Transmission Characteristics of MCR-WPT System Considering Non-Linearities of Compensation Capacitors

Frequency Splitting and Transmission Characteristics of MCR-WPT System Considering Non-Linearities of Compensation Capacitors

Wireless power transfer system rigid to tissue characteristics using metamaterial inspired geometry for biomedical implant applications

Analysis of a Nonlinear Magnetic Coupling Wireless Power Transfer System

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