Wireless Power Transfer System Adaptive to Change in Coil Separation

Lee, Juseop; Lim, Yongseok; Yang, Woojin; Lim, Seung-Ok

doi:10.1109/tap.2013.2290795

Cited by 68 publications

(27 citation statements)

References 21 publications

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“…To obtain maximum efficiency for a WPT system, several methods have been proposed and studied in prior works [11][12][13][14][15][16][17][18][19][20][21]. These methods consist of adaptive circuits to optimize efficiency based on frequency control, impedance matching control, Q-factor tuning control and adjusting the coupling coefficient.…”

Section: Introductionmentioning

confidence: 99%

“…However, the technique violates the frequency standards (Industrial Scientific Medical (ISM) Band) of wireless power transmission as it requires a wide frequency bandwidth. In [12,[14][15][16][17]22], adaptive impedance matching-based efficiency improvement is proposed. However, the range of tuning to obtain optimal efficiency was limited by the varactors employed in the circuit, and additionally, varactor losses reduced the total efficiency of the system.…”

Section: Introductionmentioning

confidence: 99%

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An Efficiency Enhancement Technique for a Wireless Power Transmission System Based on a Multiple Coil Switching Technique

Nair

Choi

2016

Energies

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For magnetic-coupled resonator wireless power transmission (WPT) systems, higher power transfer efficiency can be achieved over a greater range in comparison to inductive-coupled WPT systems. However, as the distance between the two near-field resonators varies, the coupling between them changes. The change in coupling would in turn vary the power transfer efficiency. Generally, to maintain high efficiency for varying distances, either frequency tuning or impedance matching are employed. Frequency tuning may not limit the tunable frequency within the Industrial Scientific Medical (ISM) band, and the impedance matching network involves bulky systems. Therefore, to maintain higher transfer efficiency over a wide range of distances, we propose a multiple coil switching wireless power transmission system. The proposed system includes several loop coils with different sizes. Based on the variation of the distance between the transmitter and receiver side, the power is switched to one of the loop coils for transmission and reception. The system enables adjustment of the coupling coefficient with selective switching of the coil loops at the source and load end and, thus, aids achieving high power transfer efficiency over a wide range of distances. The proposed technique is analyzed with an equivalent circuit model, and simulations are performed to evaluate the performance. The system is validated through experimental results that indicate for a fixed frequency (13.56 MHz) that the switched loop technique achieves high efficiency over a wider range of distances.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Efficiency Enhancement Technique for a Wireless Power Transmission System Based on a Multiple Coil Switching Technique

Nair

Choi

2016

Energies

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“…4(b), and its detailed analysis using J-(admittance) inverters is illustrated in Fig. 4(c) to simplify the proposed design method from [11]. According to the simplified Neumann's formulae presented in [12,13], the transmission distance (h) is a function of the diameter (D i ) and a number of turns (N i ) of the TX/RX coils.…”

Section: Proposed Wpt Systemmentioning

confidence: 99%

“…(1)- (5), we can get the values L P1 , L P2 , R 1 , R 2 , M, and k. 5. Apply the Analytic design method in [11] (by substitution in Eq. (2), (6), (5), (1), and (3), respectively, in [11]) to get the remaining circuit parameters C P1 and C P2 and the values of C S1 and C S2 that are realized in our circuit model by…”

Section: Proposed Wpt Systemmentioning

confidence: 99%

Asymmetric wireless power transfer systems using coupled DGS resonators

Hekal

Abdel‐Rahman

Allam

et al. 2016

IEICE Electron. Express

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This paper presents a new design for wireless power transfer (WPT) systems using asymmetric structures for the transmitter (TX) and the receiver (RX), and the TX/RX are constructed using spiral-strips defected ground structure (DGS) resonators. The proposed spiral-strips DGS resonator overcome the problem of low self-inductance that encountered by H-shape DGS resonator in [1,2], so that the proposed WPT system that employs the proposed spiral-strips DGS resonators has better efficiency and higher power transmission distance. Design methodology of the proposed WPT system are formulated and fabricated. The measurement results show a WPT efficiency of 78% at a transmission distance of 40 mm with the TX and RX areas of 50 × 50 mm 2 and 30 × 30 mm 2 , respectively.

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“…In particular, the related research for a maximum power transfer efficiency (PTE) has been conducted . Due to the impedance matching characteristics of the WPT system using the coupled resonant coils, the PTE of the WPT system has degraded on the different operating distances . To achieve a high‐performance WPT, it is essential to achieve a small deviation of the impedance matching according to the operating distance.…”

Section: Introductionmentioning

confidence: 99%

A compact module‐integrated wireless power transfer system with a square metal plate

Ahn

Lee

2019

Micro & Optical Tech Letters

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In this article, we propose a compact module‐integrated wireless power transfer (WPT) system for miniaturizing a WPT system and improving power transfer efficiency (PTE) within the operating distance. Using an eddy current (and its associated magnetic field) formed in a module‐integrated square metal plate, the proposed WPT system realizes a uniform mutual inductance between the coils within the operating distance and achieves an improved PTE of up to 54.7% at 6.78 MHz compared to the conventional WPT system.

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Wireless Power Transfer System Adaptive to Change in Coil Separation

Cited by 68 publications

References 21 publications

An Efficiency Enhancement Technique for a Wireless Power Transmission System Based on a Multiple Coil Switching Technique

An Efficiency Enhancement Technique for a Wireless Power Transmission System Based on a Multiple Coil Switching Technique

Asymmetric wireless power transfer systems using coupled DGS resonators

A compact module‐integrated wireless power transfer system with a square metal plate

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