Calculation of Self-Resonant Spiral Coils for Wireless Power Transfer Systems With a Transmission Line Approach

Breitkreutz, Bernd; Henke, Heino

doi:10.1109/tmag.2013.2259634

Cited by 17 publications

(15 citation statements)

References 12 publications

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“…If one is winding coils on cylindrical cores this is very effective but leads to a rather thick and complex structure in terms of manufacturing. Q factors as high as 800 have been reported for such coils [19]. For planar PCB inductors multiple turns can be achieved using spiral patterns but care must be taken as, should the inner dimension of the spiral become too small, the value of k will decrease.…”

Section: V D E S I G N M E T H O D O L O G Y a N D O P T I M I Z mentioning

confidence: 99%

“…Planar spirals, broadside coupled split rings, multi-layer spirals [16], and others all offer higher Q possibilities but are difficult to design for frequencies as low as 13.6 MHz. Wound self-resonant coils can offer Q factors in excess of 1400 but present manufacturing penalties [19].…”

Section: V D E S I G N M E T H O D O L O G Y a N D O P T I M I Z mentioning

confidence: 99%

“…If one were to use the self resonant cells of reference [21] |kQ| ¼ 55 is possible offering 50% for 21 cell lines. Using selfresonant coils taken from the literature [19] one may achieve |kQ| ¼ 199 with 80% efficiency for the 21 cell line and better than 90% over 11 cells. It is important to note here that the frequencies for optimal power transfer shown for all these cases (Fig.…”

Section: V D E S I G N M E T H O D O L O G Y a N D O P T I M I Z mentioning

confidence: 99%

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A magneto-inductive wave wireless power transfer device

Stevens

2015

Wirel Pow Transfer

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A magneto-inductive wave wireless power transfer device christopher j. stevensMagneto-inductive waves are a form of propagation which only exists in certain types of magnetic metamaterials formed from inductively coupled resonant circuits. We present an investigation of their potential as contactless power transfer devices capable of carrying power along a surface between suitably prepared terminals while simultaneously offering a broadband data channel. Input impedances and their matching conditions are explored with a view to offering a simple power system design. A device with 75% peak and 40% minimum efficiency is demonstrated and designs with potential for better than 70% mean and 90% peak are reported. The product of planar magnetic coupling and metamaterial cell Q factor is determined to be a key optimization parameter for high efficiency.

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Section: V D E S I G N M E T H O D O L O G Y a N D O P T I M I Z mentioning

confidence: 99%

Section: V D E S I G N M E T H O D O L O G Y a N D O P T I M I Z mentioning

confidence: 99%

Section: V D E S I G N M E T H O D O L O G Y a N D O P T I M I Z mentioning

confidence: 99%

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A magneto-inductive wave wireless power transfer device

Stevens

2015

Wirel Pow Transfer

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“…[16][17][18][19] In Bilotti et al 12 and Uei-Ming and Ghovanloo, 13,19 only the capacitance between adjacent turns has been taken into account and the effect of mutual capacitance of nonadjacent turns has been compensated by a correction coefficient. [16][17][18][19] In Bilotti et al 12 and Uei-Ming and Ghovanloo, 13,19 only the capacitance between adjacent turns has been taken into account and the effect of mutual capacitance of nonadjacent turns has been compensated by a correction coefficient.…”

Section: Introductionmentioning

confidence: 99%

Distributed‐element modelling for spiral resonators used in wireless power transfer

Najjarzadegan

Ghotbi

Bassirian

et al. 2017

Circuit Theory & Apps

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In this paper, a circuit model for the printed circular spiral resonators based on the piece electrical equivalent circuit is presented. Lumped circuit elements such as inductors, resistors, and mutual inductances are calculated using the conventional formulae for circular loops, whereas the mutual capacitances are calculated by a numerical algorithm. These capacitances are renormalized by scaling factors derived from a simulation-based library of the self-resonant frequency of the spiral resonators. It is shown that involving minuscule effects such as mutual capacitances of nonadjacent turns causes a more accurate estimation of the current distribution and high-frequency characteristics of the resonator. Finally, a closed-form formula for estimating the capacitor values is extracted by curve fitting leading to a decrease in analysis time. The proposed model predicts the input impedance, quality factor, and current distribution along the resonator in agreement with the results generated by full-wave simulation and experimental results.

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“…The formula they present is reasonably accurate in determining the SRF, but does not predict the higher order modes. In [7], Breitkeurtz and Henke solved a discretized transmission line model of a spiral to obtain the mode frequencies as well as the current distribution at the SRF and higher order modes. Other circuit models were introduced to model the behavior of spirals in [8] and [9], though the resonant behavior was not the focus.…”

Section: Introductionmentioning

confidence: 99%

An Empirical Expression to Predict the Resonant Frequencies of Archimedean Spirals

Hooker

Ramaswamy

Arora

et al. 2015

IEEE Trans. Microwave Theory Techn.

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This work presents an empirical formula to accurately determine the frequencies of the fundamental and higher order resonances of an Archimedean spiral in a uniform dielectric medium in the absence of a ground plane. The formula is based on method-of-moments simulations which have been experimentally validated. This empirical formula is widely applicable to a broad range of spirals from thin-ring to disk-shaped (ratio of inner to outer radii 0 to 1), with 10 or more turns.

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Calculation of Self-Resonant Spiral Coils for Wireless Power Transfer Systems With a Transmission Line Approach

Cited by 17 publications

References 12 publications

A magneto-inductive wave wireless power transfer device

A magneto-inductive wave wireless power transfer device

Distributed‐element modelling for spiral resonators used in wireless power transfer

An Empirical Expression to Predict the Resonant Frequencies of Archimedean Spirals

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