Optimum design of Wpt relay system by controlling capacitance

Kim, Ju‐Hui; Park, Byung‐Chul; Lee, Jeong‐Hae

doi:10.1002/mop.28405

Cited by 6 publications

(9 citation statements)

References 7 publications

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“…Consequently, this lowers the amount of the current (i1) flowing through L1 and also lowers the induced voltage (v2). This effect is expressed as the first term of the right side of Equation (2). Second, the voltage (v2) induced in Coil 2 is divided into L2 and C2 so that only a part of the induced voltage (V2) is delivered into port 2.…”

Section: Practical and Ideal Mutual Inductance Between Two Coilsmentioning

confidence: 99%

“…Second, the voltage (v2) induced in Coil 2 is divided into L2 and C2 so that only a part of the induced voltage (V2) is delivered into port 2. This voltage distribution is expressed by the third term on the right side of Equation (2).…”

Section: Practical and Ideal Mutual Inductance Between Two Coilsmentioning

confidence: 99%

“…Recently, multi-coil wireless power transfer (WPT) systems using three or more coils have been proposed to achieve a high power transfer efficiency (PTE) at greater distance than in the case of a conventional two-coil WPT system [1][2][3][4][5][6][7][8][9][10][11][12]. The multi-coil WPT systems are categorized into the domino structure and multiple transmitting (or receiving) coils structure.…”

Section: Introductionmentioning

confidence: 99%

“…The multi-coil WPT systems are categorized into the domino structure and multiple transmitting (or receiving) coils structure. The domino structure means that one or more coils are placed between transmitting and receiving coils [1][2][3][4][5][6]. To achieve a long transmission distance, the structure adjusts the capacitance of each coil or gaps among coils.…”

Section: Introductionmentioning

confidence: 99%

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Unilateral Route Method to Estimate Practical Mutual Inductance for Multi-Coil WPT System

2020

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Multi-coil WPT systems require mutual inductance information between coils to increase the power transmission efficiency. However, in the high frequency (HF) bands such as 6.78 MHz and 13.56 MHz, the presence of surrounding coils changes the value of the mutual inductance between the two coils due to the parasitic element effect of the coils. These parasitic effects make it harder to estimate the mutual inductance among three or more coils. In contrast to ideal mutual inductance, which has a constant value regardless of frequency and surrounding coils, we define the practical mutual inductance as the mutual inductance varied by parasitic elements. In this paper, a new method is presented to estimate the practical mutual inductance between multiple coils in the HF band. The proposed method simply configures the expression of practical mutual inductance formula because only one of two bilateral dependent voltage sources generated by mutual inductance is considered. For several coils placed along the same axis, the practical mutual inductances between coils were measured with respect to the distance between them to validate the proposed method. The practical mutual inductance obtained from the proposed method was consistent with the simulated and measured values in HF band.

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Section: Practical and Ideal Mutual Inductance Between Two Coilsmentioning

confidence: 99%

Section: Practical and Ideal Mutual Inductance Between Two Coilsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Unilateral Route Method to Estimate Practical Mutual Inductance for Multi-Coil WPT System

2020

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“…Another approach to improve the power transfer efficiency at long distance is to employ the relay resonators [16][17][18][19][20][21][22][23][24][25][26][27]. Many researches on relay resonators of magnetic resonance WPT have been conducted to extend the distance of power transfer.…”

Section: Introductionmentioning

confidence: 99%

Design of Asymmetrical Relay Resonators for Maximum Efficiency of Wireless Power Transfer

Choi

Lee

2016

International Journal of Antennas and Propagation

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This paper presents a new design method of asymmetrical relay resonators for maximum wireless power transfer. A new design method for relay resonators is demanded because maximum power transfer efficiency (PTE) is not obtained at the resonant frequency of unit resonator. The maximum PTE for relay resonators is obtained at the different resonances of unit resonator. The optimum design of asymmetrical relay is conducted by both the optimum placement and the optimum capacitance of resonators. The optimum placement is found by scanning the positions of the relays and optimum capacitance can be found by using genetic algorithm (GA). The PTEs are enhanced when capacitance is optimally designed by GA according to the position of relays, respectively, and then maximum efficiency is obtained at the optimum placement of relays. The capacitance of the second resonator tonth resonator and the load resistance should be determined for maximum efficiency while the capacitance of the first resonator and the source resistance are obtained for the impedance matching. The simulated and measured results are in good agreement.

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Effect of Additional Transmitting Coils on Transfer Distance in Multiple-Transmitter Wireless Power Transfer System

Jeon

Seo

2022

IEEE Access

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Wireless power transfer (WPT) technology has been widely introduced and developed over the past few years. Nevertheless, the basic WPT configuration using one transmitting (Tx) coil and one receiving (Rx) coil still achieves very limited performance in terms of power transfer distance. To overcome this limitation, various multi-coil WPT systems using three or more coils have been studied. Among them, a multiple-input single-output (MISO) structure can provide the Rx with advanced freedom in an extensive lateral area. However, few studies have investigated how far multi-Tx coils can increase the transfer distance.In this paper, we analyze the transfer distance and lateral coverage based on the generalized critical coupling condition and system energy efficiency according to the number of additional Tx coils in the MISO WPT system. The results demonstrate that the MISO WPT system using planarly arranged Tx coils improves by barely 1% in the optimal transfer distance, which achieves the maximum output power condition in a single-Tx WPT system. To validate our analysis, the MISO WPT system with seven Tx coils and seven LCC inverters was implemented and its performance was assessed. The measured results agreed well with the theoretically calculated results.INDEX TERMS MISO, multiple transmitters, magnetic beamforming, system efficiency, transfer distance, wireless power transfer.

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Optimum design of Wpt relay system by controlling capacitance

Cited by 6 publications

References 7 publications

Unilateral Route Method to Estimate Practical Mutual Inductance for Multi-Coil WPT System

Unilateral Route Method to Estimate Practical Mutual Inductance for Multi-Coil WPT System

Design of Asymmetrical Relay Resonators for Maximum Efficiency of Wireless Power Transfer

Effect of Additional Transmitting Coils on Transfer Distance in Multiple-Transmitter Wireless Power Transfer System

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