Coupled-mode analysis of frequency splitting phenomena in CPT systems

Niu, Wangqiang; Gu, Wenjin; Chu, Jianxin; Shen, Aidi

doi:10.1049/el.2012.0953

Cited by 48 publications

(36 citation statements)

References 3 publications

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“…This indicates that the maximum transfer efficiency can be achieved only in the resonant state. Similarly, by taking the derivative of the transfer power P L with respect to the driving angular frequency ω, the optimization conditions based on maximizing the transfer power can be obtained as Equation (9), which indicates that the frequency splitting phenomenon appears [11]:…”

Section: Coupled Mode Theorymentioning

confidence: 99%

“…Normally, either coupled mode theory (CMT) [9][10][11][12][13][14][15][16][17] or circuit theory (CT) [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] can be used for analyzing SCMR. Transient analysis based on CT is sometimes more accurate than that based on CMT [18], thus CT is widely adopted.…”

Section: Introductionmentioning

confidence: 99%

“…Transient analysis based on CT is sometimes more accurate than that based on CMT [18], thus CT is widely adopted. Various hot research spots, including system architectures [14][15][16][17], frequency splitting [11,24,26,28,48,49], impedance matching methods [20,26,27,[50][51][52][53][54][55][56][57][58][59][60], optimization designs [25,42,[61][62][63][64][65][66][67][68][69][70][71][72][73][74][75][76][77] and practical applications [37,[78][79][80][81]…”

Section: Introductionmentioning

confidence: 99%

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A Critical Review of Wireless Power Transfer via Strongly Coupled Magnetic Resonances

2014

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Strongly coupled magnetic resonance (SCMR), proposed by researchers at MIT in 2007, attracted the world's attention by virtue of its mid-range, non-radiative and high-efficiency power transfer. In this paper, current developments and research progress in the SCMR area are presented. Advantages of SCMR are analyzed by comparing it with the other wireless power transfer (WPT) technologies, and different analytic principles of SCMR are elaborated in depth and further compared. The hot research spots, including system architectures, frequency splitting phenomena, impedance matching and optimization designs are classified and elaborated. Finally, current research directions and development trends of SCMR are discussed.

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Section: Coupled Mode Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Critical Review of Wireless Power Transfer via Strongly Coupled Magnetic Resonances

2014

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“…We may consider placing the MM near the Tx or Rx coil. While, in this case, the efficiency is also partly enhanced, but the MM is strongly coupled to the Tx or Rx resonators, resulting in frequency splitting phenomena [41]. The frequency splitting suppresses energy transmission around the original resonant frequency, leading to efficiency reduction.…”

Section: Simulation and Experimental Resultsmentioning

confidence: 98%

“…An AV-3656A VNA (made by NO. 41 Research Institute of China Electronics Technology Group Corp.) was used to measure the S-parameters of the WPT system. To verify the enhancement of the WPT system by using CLSRs MM, the four-coil systems integrated with and without MM slab are investigated by the experiments, respectively.…”

Section: Simulation and Experimental Resultsmentioning

confidence: 99%

Metamaterial-Based High-Efficiency Wireless Power Transfer System at 13.56 MHZ for Low Power Applications

Chen¹,

Zhixia²,

Hu³

et al. 2017

PIER B

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Abstract-Magnetically coupled resonant wireless power transfer (WPT) has been employed in many applications, including wireless charging of portable electronic devices, electric vehicles and powering of implanted biomedical devices. However, transmission efficiency decreases sharply due to divergence of magnetic field, especially in under coupled region. Electromagnetic (EM) metamaterial (MM) can manipulate the direction of EM fields due to its abnormal effective permittivity or permeability. In this paper, an ultra-thin and extremely sub-wavelength magnetic MM is designed for a 13.56 MHz WPT system to enhance magnetic field and its power transfer efficiency (PTE). The WPT systems are investigated theoretically, experimentally and by simulation. A relatively high maximum efficiency improvement of 41.7% is obtained, and the range of efficient power transfer can be greatly extended. The proposed MM structure is very compact and ultra-thin in size compared with early publications for some miniaturized applications. In addition, large area, homogeneous magnetic field is obtained and discussed using the proposed MM. Finally, the proposed MM is applied in a more practical WPT system (with a low power light bulb load) to reveal its effects. The bulb brightness intuitively verifies the efficiency improvement in the WPT system with the MM.

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A methodology to achieve the maximum transfer efficiency for magnetic coupling wireless power transfer systems

et al. 2019

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Coupled-mode analysis of frequency splitting phenomena in CPT systems

Cited by 48 publications

References 3 publications

A Critical Review of Wireless Power Transfer via Strongly Coupled Magnetic Resonances

A Critical Review of Wireless Power Transfer via Strongly Coupled Magnetic Resonances

Metamaterial-Based High-Efficiency Wireless Power Transfer System at 13.56 MHZ for Low Power Applications

A methodology to achieve the maximum transfer efficiency for magnetic coupling wireless power transfer systems

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