Comprehensive Analysis and Measurement of Frequency-Tuned and Impedance-Tuned Wireless Non-Radiative Power-Transfer Systems

Heebl, Jason D.; Thomas, Erin M.; Penno, Robert P.; Grbic, Anthony

doi:10.1109/map.2014.6931657

Cited by 31 publications

(38 citation statements)

References 34 publications

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“…By substituting Equations (6), (9), and (12) into Equation 11, the system efficiency η S can be obtained.…”

Section: Topology Transmission Parametersmentioning

confidence: 99%

“…Many works [12][13][14][15][16][17][18][19] have been done to improve the performance of the WPT system with uncertain parameters. In [12], an adaptive frequency-tracking technique is proposed to address coil distance and orientation variations. Through the method, the WPT system can maintain nearly constant efficiency when the user moves the receiver within a short range.…”

Section: Introductionmentioning

confidence: 99%

“…Although these methods can improve the performance of the WPT system with uncertain parameter variations, there still exist some drawbacks: (1) To deal with uncertain parameter variations, an active compensation system (like frequency tracking system, automatic impedance matching system, and H ∞ control system, etc.) is needed [12][13][14][15][16][17][18][19]. However, introducing the active compensation system will obviously increase the size, control difficulty, and energy losses of the overall WPT system.…”

Section: Introductionmentioning

confidence: 99%

“…Using the proposed method, the WPT system can achieve good robustness to uncertain parameter variations. Compared with previous methods [12][13][14][15][16][17][18][19], the proposed method only uses passive compensation networks (Q-type impedance matching networks). The structure and control difficulty of the overall WPT system can be reduced.…”

Section: Introductionmentioning

confidence: 99%

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Enhancing the Robustness of the Wireless Power Transfer System to Uncertain Parameter Variations Using an Interval-Based Uncertain Optimization Method

et al. 2018

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Uncertainty commonly exists in the wireless power transfer (WPT) systems for moving objects. To enhance the robustness of the WPT system to uncertain parameter variations, a modified WPT system structure and an interval-based uncertain optimization method are proposed in this paper. The modified WPT system, which includes two Q-type impedance matching networks, can switch between two different operating modes. The interval-based uncertain optimization method is used to improve the robustness of the modified WPT system: First, two interval-based objective functions (mean function and variance function) are defined to evaluate the average performance and the robustness of the system. A double-objective uncertain optimization model for the modified WPT system is built. Second, a bi-level nested optimization algorithm is proposed to find the Pareto optimal solutions of the proposed optimization model. The Pareto fronts are provided to illustrate the tradeoff between the two objectives, and the robust solutions are obtained. Experiments were carried out to verify the theoretical method. The results demonstrated that using the proposed method, the modified WPT system can achieve good robustness when the coupling coefficient, the operating frequency, the load resistance or the load reactance varies over a wide range.

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“…By substituting Equations (6), (9), and (12) into Equation 11, the system efficiency η S can be obtained.…”

Section: Topology Transmission Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Enhancing the Robustness of the Wireless Power Transfer System to Uncertain Parameter Variations Using an Interval-Based Uncertain Optimization Method

et al. 2018

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“…The magnetically coupled loops, when resonated out, was proposed for use in midrange power transfer [1,3]. It has been shown that one can transfer power at a distance several times the radius or the length of the loops in magnetically coupled resonant loops [4,5]. Moreover, when the loops operate in a strongly coupled regime, it is almost possible to achieve a distance-independent power transfer efficiency.…”

Section: Introductionmentioning

confidence: 99%

A Circuit Model-Based Analysis of Magnetically Coupled Resonant Loops in Wireless Power Transfer Systems

Sis¹

2018

Electrica

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Magnetically coupled resonant loops can be represented by a lumped element circuit model. Each parameter in the lumped element model can be expressed as a function of loop geometry and the separation between the loops; therefore, the geometry can be systematically changed, and the power transfer efficiency of the coupled loops can be predicted. This paper presents a simulation-based efficiency analysis for wireless power transfer systems utilizing magnetically coupled resonant loops. The behavior of power transfer efficiency is studied for various loop geometry parameters, and the simulation results are presented in detail. These results clearly show that there is a trade-off between peak efficiency and critical coupling distance, both of which depend on the loop size, frequency of operation, and source-load impedances. To verify the accuracy model, two identical circular loops are fabricated and measured, and the measurement results agree well with the model.

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Wearable Coaxially‐Shielded Metamaterial for Magnetic Resonance Imaging

Zhu,

Wu,

Anderson

et al. 2024

Advanced Materials

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Recent advancements in metamaterials have yielded the possibility of a wireless solution to improve signal‐to‐noise ratio (SNR) in magnetic resonance imaging (MRI). Unlike traditional closely packed local coil arrays with rigid designs and numerous components, these lightweight, cost‐effective metamaterials eliminate the need for radio frequency cabling, baluns, adapters, and interfaces. However, their clinical adoption has been limited by their low sensitivity, bulky physical footprint, and limited, specific use cases. Herein, we introduce a wearable metamaterial developed using commercially available coaxial cable, designed for a 3.0 T MRI system. This metamaterial inherits the coaxially‐shielded structure of its constituent cable, confining the electric field within and mitigating coupling to its surroundings. This ensures safer clinical adoption, lower signal loss, and resistance to frequency shifts. Weighing only 50 g, the metamaterial maximizes its sensitivity by conforming to the anatomical region of interest. MRI images acquired using this metamaterial with various pulse sequences achieve an SNR comparable or even surpass that of a state‐of‐the‐art 16‐channel knee coil. This work introduces a novel paradigm for constructing metamaterials in the MRI environment, paving the way for the development of next‐generation wireless MRI technology.This article is protected by copyright. All rights reserved

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Comprehensive Analysis and Measurement of Frequency-Tuned and Impedance-Tuned Wireless Non-Radiative Power-Transfer Systems

Cited by 31 publications

References 34 publications

Enhancing the Robustness of the Wireless Power Transfer System to Uncertain Parameter Variations Using an Interval-Based Uncertain Optimization Method

Enhancing the Robustness of the Wireless Power Transfer System to Uncertain Parameter Variations Using an Interval-Based Uncertain Optimization Method

A Circuit Model-Based Analysis of Magnetically Coupled Resonant Loops in Wireless Power Transfer Systems

Wearable Coaxially‐Shielded Metamaterial for Magnetic Resonance Imaging

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