Quantitative investigation into the use of resonant magneto‐inductive links for efficient wireless power transfer

Zhang, Jin; Cheng, Chonghu

doi:10.1049/iet-map.2014.0783

Cited by 9 publications

(13 citation statements)

References 15 publications

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“…The angle vector, θ = [θ TX , θ RX ] shown in Figures 1b and 9a, is tuned to achieve the optimal k for the three predetermined-goals WPT. According to the measured S-parameters based on port impedance z 0 = 50 Ω of the network analyzer, the PDL (or I RX ) and PTE of the WPT network with arbitrary R S and R L values can be determined by transforming calculation method [22,26], and the block diagram for the procedures is presented in Figure 9b. with the aid of the two-port VNA, as shown in Figure 9a. Figure 9b.…”

Section: Methodsmentioning

confidence: 99%

“…However, it is effective using the proposed optimal method to achieve the preset constant PDLs at maximum PTEs starting from D TR = 0.4 m and 0.5 m for PDL C = 0.5 W and 1 W respectively, for the maximum offsets below PDL C = 0.5 W at D TR = 0.4 m and PDL C = 1 W at D TR = 0.5 m are 12.9% and 9.21% respectively. The effects of cross coupling on energy transfer can be addressed through power flow analysis [22]. The power flow from TX and IX to Rx can be calculated by P TR " Re`´jωM TR I TX IR X˘a nd P IR " Re`´jωM IR I IX IR X˘, respectively.…”

Section: Verification Of the Feasibility For Predetermined-goals Wirementioning

confidence: 99%

“…However, the optimized coils with the proper size, turns and conductor width for the maximizing PTE in these references were only effective for a certain transfer distance. A constant amount of PDL need to be transferred at maximum PTE for practical application in a WPT system [20][21][22]. However, on-chip frequency-tracking oscillation class-D PA in [20] and additional compensation capacitors in [21] have increased the cost and volume of WPT system.…”

Section: Introductionmentioning

confidence: 99%

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Analysis and Optimization of Three-Resonator Wireless Power Transfer System for Predetermined-Goals Wireless Power Transmission

Jin

Cheng

2016

Energies

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Three-resonator wireless power transfer (WPT) systems have been proposed to improve the power transfer efficiency (PTE) and power delivered to the load (PDL) in recent years. However, analysis formulas of a three-resonator WPT system are complicated, and the parameters for clarifying the transfer characteristics of this system are difficult to extract. In this paper, concise formulas for analyzing PTE and PDL of the three-resonator system are derived by introducing three factors. Diagram discriminance based on the derived formulas is proposed to obtain the frequency splitting criterions of PTE and PDL in this system. Further, at the transfer distances, where the PTE and PDL are low at original frequency due to frequency splitting phenomenon, the two predetermined-goals of maximizing PTE and PDL are achieved by optimizing coupling strength between the three resonators. The third predetermined-goal of obtaining a constant amount of PDL transfer at maximum PTE is also implemented based on basic algorithms in numerical software. Finally, Simulation and measurement results verify the correctness of analyzing the transfer characteristics of three-resonator WPT system using the presented concise formulas and discriminance. Moreover, effectiveness of realizing the three predetermined-goals via the proposed optimization method is confirmed with experiments.

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Section: Methodsmentioning

confidence: 99%

Section: Verification Of the Feasibility For Predetermined-goals Wirementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analysis and Optimization of Three-Resonator Wireless Power Transfer System for Predetermined-Goals Wireless Power Transmission

Jin

Cheng

2016

Energies

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“…The early structure of a magnetic coupling WPT system was composed of four elements: source loop, transmitting coil (TX), receiving coil (RX), and load loop [2][3][4]. In order to heighten transmission distance with power delivered to the load (PDL), multi-repeater WPT systems have been proposed [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Power Transmission for on-Road Agv Wireless Charging Systems Using a Current-Optimized Technique

Jin¹,

Chen²,

Zhang³

2019

PIER C

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This paper provides a sound wireless power transfer (WPT) recharging solution for onroad automated guided vehicle (AGV) system. In this solution, multiple transmitting coils serve as power transmitters (TXs), and a receiving coil in AGV serves as a power receiver (RX). The multiple TXs are along a straight track for dynamic charging to AGV. The circuit model of multiple-TX and single-RX WPT system is first constructed based on circuit theory (CT), and then current-optimized scheme based on Lagrangian multiplier method is proposed to tune the currents in multiple TXs to maximize the power delivered to the load (PDL). The equal current (EC Case) flowing through each TX is compared with the optimal current (OC Case). Through contrastive analysis, the OC Case shows its advantages in PDL. Finally, the theoretical analysis results are confirmed by the results of full-wave electromagnetic simulation.

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“…The research of magnetic-resonance coupling is particularly prized in the areas of wireless power transfer (WPT) since this research was published in the US journal Science in 2007 [1]. Many interesting fields on magnetic-resonance WPT have been studied in just the last 10 years alone [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Efficiency Analysis of Multiple-Transmitter Wireless Power Transfer Systems

Jin

Wang

2018

International Journal of Antennas and Propagation

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The range of the power transmission region can be effectively enlarged by a multiple-transmitter (TXs) and single-receiver (RX) magnetic wireless power transfer (WPT) system. However, the power transfer efficiency (PTE) of the WPT system with two TXs and a single RX has been intensively studied in the past few years. Therefore, a deep analysis of multiple-TX WPT systems needs to be implemented urgently to achieve the highest PTE in a wider range of power transmission. This paper analyzes a general multiple-TX single-RX system in detail based on the circuit model. Two optimal conditions, in which the feeding amplitude ratios need be equal to the mutual inductance ratios and the optimal load should be connected to RX, are derived to obtain the highest PTE. In the experiment part, the feeding amplitude ratios for multiple TXs are implemented by a proposed lumped transformer for the first time. The use of the lumped transformer reduces the complexity compared with the use of multiple inverters to achieve predetermined feeding amplitude ratios. Multiple-TX systems are designed and measured to validate the theoretical analysis. Experimental results agree very well with theoretical calculations.

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Quantitative investigation into the use of resonant magneto‐inductive links for efficient wireless power transfer

Cited by 9 publications

References 15 publications

Analysis and Optimization of Three-Resonator Wireless Power Transfer System for Predetermined-Goals Wireless Power Transmission

Analysis and Optimization of Three-Resonator Wireless Power Transfer System for Predetermined-Goals Wireless Power Transmission

Enhanced Power Transmission for on-Road Agv Wireless Charging Systems Using a Current-Optimized Technique

Efficiency Analysis of Multiple-Transmitter Wireless Power Transfer Systems

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