Surface Spiral Parallel and Antiparallel Winding Designs for High Efficiency, Low Spatial Voltage Stress, and Inductive Wireless Power Transfer Systems

Zhu, Guangqi; Lorenz, Robert D.

doi:10.1109/tia.2018.2864198

Cited by 17 publications

(4 citation statements)

References 12 publications

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“…Future resonator designs for high frequency operation may benefit from the electroplating and 3D printing technologies. A good example is the surface spiral winding printed on the surface of a circular tube of polycarbonate (PC) for high-frequency (MHz) and high-power (kW) applications [108].…”

Section: Considerations For Mega-hertz Resonator Constructionmentioning

confidence: 99%

Wireless Power Transfer: A Paradigm Shift for the Next Generation

Hui

Yang

Zhang

2023

IEEE J. Emerg. Sel. Topics Power Electron.

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The first generation of wireless power transfer (WPT) standard Qi, launched in 2010, contains a wide range of transmitter and receiver designs with the aim of maximizing compatibility to attract many manufacturers to share the same standard. Such compatibility feature (i.e., interoperability) has not only attracted over 400 company members in the Wireless Power Consortium (WPC), but also facilitated a fast-growing wireless power market for a decade. The WPC is now expanding the scope of WPT applications to mid-power and high-power applications up to several kilowatts while the Society for Automobile Engineers also set the SAE standard for wireless charging of electric vehicles (EVs) up to tens of kilowatts. Without compromising compatibility, the authors share in this paper their views on the need for a paradigm shift from compatibility to optimal performance in terms of maximum energy efficiency for the entire charging process and minimum charging time. This paradigm change is imminent and important in view of the increasing power of WPT applications. Several enabling technologies essential to the paradigm shift will be addressed.

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Section: Considerations For Mega-hertz Resonator Constructionmentioning

confidence: 99%

Wireless Power Transfer: A Paradigm Shift for the Next Generation

Hui

Yang

Zhang

2023

IEEE J. Emerg. Sel. Topics Power Electron.

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“…Meanwhile, the corresponding efficiencies of the mica, polypropylene, polyimide, and fiberglass coils are 77.2%, 81.8%, 78.3%, and 78.7%, respectively. Due to the skin effect at the high operating frequency near the self-resonance frequency, the AC resistance will account for the most of the total resistance [32][33][34]. The skin depth is 0.22 mm for copper at 85 kHz thus the maximum effective thickness for conduction of each turn is 0.44 mm.…”

Section: System Experimental Verificationmentioning

confidence: 99%

Low-Frequency Medium Power Capacitor-Free Self-Resonant Wireless Power Transfer

Jiang

Gaona

Shen

et al. 2021

IEEE Trans. Ind. Electron.

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With the rapid development of wireless power transfer (WPT), the self-resonant WPT system without using additional compensation capacitors has attracted attention. However, most of reported self-resonant WPT systems have low power transfer (less than 100 W) and high operating frequencies at megahertz. In this paper, four multi-layer, self-resonant WPT coil pads with different dielectrics are designed and experimentally validated. The aim of this paper is to increase the power rating and decrease the operating frequency for capacitor-free WPT system compared to reported systems used in consumer electronics. Analysis of integrated compensation capacitance, inductance, and parasitic capacitance of the coil is provided. Finite Element Analysis (FEA) is used to evaluate four dielectric materials, mica, polypropylene, polyimide, and fiberglass. An experimental setup has been developed, which can achieve more than 360 W power transfer for a 120 mm air gap with an efficiency of 82% and an operating frequency of near 80 kHz.

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“…Copper tubes have also been used in high power applications at several hundreds of kHz or even at some MHz, especially in the field of the induction heating [36], [37]. However, the use of copper tubes as an alternative to copper litz wires for IPT applications has barely been considered in the literature, and the existing works are rather preliminary approaches [38] or solutions focused on improving the quality factor Q in some specific applications [39], [40]. The idea of copper tubes has been also extended to litz wires [41].…”

Section: Introductionmentioning

confidence: 99%

Comparative Evaluation of Different Cables for Magnetic Couplers in Inductive Power Transfer Systems

Acero,

Lope,

Carretero

et al. 2024

IEEE Trans. on Ind. Applicat.

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Copper litz wires are widely used in wireless charging stations of light-duty electric vehicles. This type of cable is specifically mentioned in the SAE J2954 standard. However, details as the number and diameter of strands, or the material of conductors are not mentioned in the standard, which makes room to address some research and innovations. In this work, several alternatives to the traditional copper-litz wires are analyzed. Specifically, aluminum litz wire, copper-clad aluminum litz wire, and copper tubes are considered as alternatives to standard litz wire for the mentioned application. Potential benefits of the considered alternatives could include weight and cost savings. However, these advantages could not be enough to justify a wiring change if the resistance of the power pads increases and, equivalently, the efficiency of the electromagnetic power transfer decreases. For this reason, a model of the parasitic resistance of windings is proposed by combining the analytical ac resistance of two-layered round strands and finite element simulations. This model is used to obtain a figure of merit related with the efficiency of the electromagnetic energy transfer which is used to compare the different cables. Apart from efficiency, thermal behavior, cost and weight are also considered for comparison purposes. As a result, some conclusions about the suitability of each cable with respect to the operating frequency range are extracted.

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Surface Spiral Parallel and Antiparallel Winding Designs for High Efficiency, Low Spatial Voltage Stress, and Inductive Wireless Power Transfer Systems

Cited by 17 publications

References 12 publications

Wireless Power Transfer: A Paradigm Shift for the Next Generation

Wireless Power Transfer: A Paradigm Shift for the Next Generation

Low-Frequency Medium Power Capacitor-Free Self-Resonant Wireless Power Transfer

Comparative Evaluation of Different Cables for Magnetic Couplers in Inductive Power Transfer Systems

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