MHz frequencies, kW, 30 cm gap wireless power transfer with low air gap flux density and high efficiency using surface spiral winding coils

Deng, Cong; Zhu, Guangqi; Lorenz, Robert D.

doi:10.1109/apec.2017.7930914

Cited by 10 publications

(3 citation statements)

References 16 publications

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“…All the samples were characterized at 0 < f < 15 MHz frequency range which covers all the values applied to the design of the recent large-scale and sub-meter gap WPT systems. [17,[35][36][37] In addition, a wide-bandwidth (500 MHz) digital storage oscilloscope (TDS3052B Tektronix, Inc)…”

Section: Characterizationmentioning

confidence: 99%

Multi-walled carbon nanotube-coated spiral coils for loss reduction in wireless power transfer systems

Keramatnejad

Golgir

et al. 2018

Carbon

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Realization of high efficiency and long transmission range in high-frequency wireless power transfer (WPT) systems has always been hindered by the increased resistance due to the eddy current loss occurring in the inductive coils. In this study, multi-walled carbon nanotube-coated copper (MWCNT-Cu) coils are successfully introduced to address this limitation by implementing the frequency-inert MWCNT channels along with using their high-surface areas to realize the electromagnetic shielding of the Cu substrate through multiple reflection mechanisms. At a frequency of 15 MHz, the resistance of the individual MWCNT-Cu coil was reduced to less than 40% of its original value for primitive Cu, leading to more than a four-fold increase in their quality factor. When MWCNT-Cu coils were used as the transmitting component, the transmission efficiency of the WPT system increased from 10.57% to 95.81% at a transmission distance of 4 cm and a frequency of 3.45 MHz. Finally, it was demonstrated that the loss reduction improved as the eddy current loss became more severe in coils with higher inductance values, which makes this approach promising for significantly improving the performance of inductive components in WPT applications.

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Section: Characterizationmentioning

confidence: 99%

Multi-walled carbon nanotube-coated spiral coils for loss reduction in wireless power transfer systems

Keramatnejad

Golgir

et al. 2018

Carbon

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“…In recent years, wireless power transfer (WPT) technology has become an important topic in industry and academia due to its advantages to many emerging applications [1]- [5]. The specifications and characteristics differ significantly for diverse WPT applications.…”

Section: Introductionmentioning

confidence: 99%

“…For example, the power level can be few microwatts in integrated circuit applications [1], or, few watts in consumer electronics and biomedical applications [2], [3], or even hundreds of kilowatts in electric vehicle and industrial applications [4], [5]. Similarly, operating frequency can vary from a few kHz up to MHz range [1]- [5]. Therefore, constraints, performance goals and design methodology for each WPT application are very different from each other.…”

Section: Introductionmentioning

confidence: 99%

Revisiting Two-Port Network Analysis for Wireless Power Transfer (WPT) Systems

Jayathurathnage¹,

Vilathgamuwa

Simovski³

2018

2018 IEEE 4th Southern Power Electronics Conference (SPEC)

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This paper discusses the applicability of the twoport network model for the analysis of wireless power transfer (WPT) systems. The two-port network model has been extensively used to analyze microwave circuits, and identical principles have been applied to WPT. The standard gain parameters defined for the two-port networks are critically analyzed with regards to WPT systems. The usefulness and the practical limitations of the gain parameters are highlighted. In addition to power transfer efficiency (PTE), an alternative gain parameter, square voltage gain is defined to estimate the power transfer capability of the WPT system. The proposed performance indices are then computed in terms of generalized two-port network parameters along with a generalized optimization methodology. A case study is presented for the optimization of a WPT system with a repeater.

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Achieving low magnetic flux density and low electric field intensity for an inductive wireless power transfer system

Zhu

Lorenz

2017

2017 IEEE Energy Conversion Congress and Exposition (ECCE)

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MHz frequencies, kW, 30 cm gap wireless power transfer with low air gap flux density and high efficiency using surface spiral winding coils

Cited by 10 publications

References 16 publications

Multi-walled carbon nanotube-coated spiral coils for loss reduction in wireless power transfer systems

Multi-walled carbon nanotube-coated spiral coils for loss reduction in wireless power transfer systems

Revisiting Two-Port Network Analysis for Wireless Power Transfer (WPT) Systems

Achieving low magnetic flux density and low electric field intensity for an inductive wireless power transfer system

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