Robust extended-range wireless power transfer using a higher-order PT-symmetric platform

Sakhdari, Maryam; Hajizadegan, Mehdi; Chen, Pai‐Yen

doi:10.1103/physrevresearch.2.013152

Cited by 45 publications

(25 citation statements)

References 51 publications

(96 reference statements)

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“…This system self-tracks and oscillates at a variable resonant frequency to achieve a high power-transfer efficiency, because the voltage amplitudes are equally distributed between the source and load as long as they are strongly coupled with the coupling rate κ. Other reports ( 31 , 32 ) have deployed a neutral coil between the source and the load to enhance the operation range further in the distal direction by relaying the power. In the previous PT-symmetric systems, however, only a single coil interacts with the load coil.…”

Section: Introductionmentioning

confidence: 99%

Wide-range robust wireless power transfer using heterogeneously coupled and flippable neutrals in parity-time symmetry

et al. 2022

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Recently, stationary wireless power transfer (WPT) has been widely adopted in commercial devices. However, the current WPT configuration is limited in its operational area and susceptible to operating condition changes, impeding its applications for dynamic environments. To overcome the limitations, we propose a WPT system with laterally aligned neutral elements in parity-time (PT) symmetry, which can widen the operational area with the number of neutrals N . Compared to the conventional multiple-input–single-output WPT, the dimension of system complexity is substantially reduced from R × C N to R N+ 1 because the neutral amplitudes are simply controlled by coupling capacitors. The operational frequency is automatically adjusted to a real eigenvalue of the PT-symmetric system to achieve high voltage gain and efficiency, making the system robust. The performance of the system calculated by the coupled-mode theory was experimentally verified with rigid and flexible types of receivers, confirming its potential in both industrial and biomedical electronics.

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Section: Introductionmentioning

confidence: 99%

Wide-range robust wireless power transfer using heterogeneously coupled and flippable neutrals in parity-time symmetry

et al. 2022

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“…There is a 1% increase in output voltage for a 50% increase in input currents, which concludes with the drop in efficiency for a high duty cycle. The input impedance with respect to the duty cycle is presented by using Equations (12) and ( 17) [38]. With the increase in duty cycle from 0.5, the input impedance drops significantly resulting in a high current.…”

Section: Discussion On the Impact Of Duty And Frequency On Zvs Propertymentioning

confidence: 99%

“…Recent developments in power electronics in reference to switching devices have made an impact in the field of wireless power charging, which has evolved its concept from low power to high power applications because of its safe, reliable, and convenient charging techniques. Especially, after the success of wireless mobile charging in the present market, the topics related to wireless power transfer (WPT) have expanded to medical [1][2][3], automobile [4][5][6][7], and automation areas [8][9][10][11][12][13]. In the past decade, inductive wireless power transfer (IPT) and resonant wireless power transfer have drawn tremendous attention in both industry and academic fields.…”

Section: Introductionmentioning

confidence: 99%

A Case Study: Influence of Circuit Impedance on the Performance of Class-E2 Resonant Power Converter for Capacitive Wireless Power Transfer

Bezawada

Zhang

2021

Electronics

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The evolution of power electronics led to rapid development in wireless charging technology; as a result, a single active switch topology was introduced. The present market utilizes inductive wireless power transfer (IPT); because of the disadvantages of cost, size, and safety concerns, research on wireless power transfer was diverted towards capacitive wireless power transfer (CPT). This paper studies the optimal impedance tracking of the capacitive wireless power transfer system for maximum power transfer. Compared to prior methods developed for maximum power point tracking in power control, this paper proposes a new approach by means of finding impedance characteristics of the CPT system for a certain range of frequencies. Considering the drone battery as an application, a single active switch Class-E2 resonant converter with circular coupling plates is utilized. Impedance characteristics are identified with the help of equations related to the input and resonant impedance. The impedance tracking is laid out for various resonant inductors, and the difference in current peak is observed for each case. Simulations verify and provide additional information on the reactive type. Additionally, hardware tests provide the variation of input current and output voltage for a range of frequencies from 70 kHz to 300 kHz. Efficiency at the optimal impedance points for a resonant inductor with 50 μH and 100 μH are tested and analyzed. It is noted that the efficiency for a resonant inductor with 50 μH is 8% higher compared to the CPT with a 100 μH resonant inductor. Further hardware tests were performed to investigate the impact of frequency and duty cycle variation. Zero-voltage-switching (ZVS) limits have been discussed with respect to both frequency and duty cycle.

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“…These physical systems share a common feature, that is, the non-Hermitian degeneracy and exceptional points (EPs) where Taylor series expansion fails to converge in the multi-valued complex eigenspectrum. The appearance of branching singularities at EPs [7][8][9]18] has led to a variety of sensing [17][18][19][20][21][22][23][24][25], imaging [26,27], information processing [28][29][30][31][32][33][34], and wireless power transfer [35,36] applications. Besides, another unusual kind of singularity, coherent perfect absorber-laser (CPAL) point, can be observed in PTsymmetric systems [6,[37][38][39][40][41][42] constituted by coupled gain and loss oscillators.…”

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confidence: 99%

Enhanced Radio-Frequency Sensors Based on a Self-Dual Emitter-Absorber

Yang

Farhat

et al. 2021

Phys. Rev. Applied

Self Cite

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We propose and experimentally demonstrate a parity-time (PT)-symmetric electronic system exhibiting the self-dual emitter-absorber property with a remarkable modulation depth in the radio-frequency (RF) region. The dramatically different RF responses between the emitter and absorber modes may allow detection of ultrasmall conductive or reactive perturbations. Our measurement results show that even a perturbation of the 10 -2 order can greatly change the system's output intensity by more than 30 dB, consistent with the theoretical prediction. The measured sensitivity is far beyond traditional sensors based on a Fabry-Perot resonator, and may lead to monotonic RF sensors with high sensitivity and resolvability.

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Robust extended-range wireless power transfer using a higher-order PT-symmetric platform

Cited by 45 publications

References 51 publications

Wide-range robust wireless power transfer using heterogeneously coupled and flippable neutrals in parity-time symmetry

Wide-range robust wireless power transfer using heterogeneously coupled and flippable neutrals in parity-time symmetry

A Case Study: Influence of Circuit Impedance on the Performance of Class-E2 Resonant Power Converter for Capacitive Wireless Power Transfer

Enhanced Radio-Frequency Sensors Based on a Self-Dual Emitter-Absorber

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