Theoretical Analysis of Planar Spiral Coils between Two Multilayer Media for Electric Vehicle Wireless Charging

Luo, Zhi‐Chao; Wei, Xuezhe

doi:10.3390/en11040693

Cited by 5 publications

(3 citation statements)

References 29 publications

(34 reference statements)

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“…Considering the manufacturing tolerance of the given design, the fabricated GA and VA coil may have an out of range electrical parameter that is given in the standard, especially in terms of inductances and coupling coefficient. The self-inductance and mutual inductance between the two coils are dimensionally defined, including by the number of turns, the outer/inner radius of a coil, the thickness of the coil, and coil to coil distances, it is not easy to control self-inductance once they are fabricated [11,12]. Figure 3 illustrates the air-gap between the magnetic materials.…”

Section: Proposed Methods To Tune the Self-inductance And Coupling Coefficient By Modifying The Effective Permeabilitymentioning

confidence: 99%

Analysis and Introduction of Effective Permeability with Additional Air-Gaps on Wireless Power Transfer Coils for Electric Vehicle Based on SAE J2954 Recommended Practice

Kim

Huang

et al. 2019

Energies

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The wireless power transfer (WPT) method for electric vehicles (EVs) is becoming more popular, and to ensure the interoperability of WPT systems, the Society of Automotive Engineers (SAE) established the J2954 recommended practice (RP). It includes powering frequency, electrical parameters, specifications, testing procedures, and other contents for EV WPT. Specifically, it describes the ranges of self-inductances of the transmitting coil, the receiving coil, and coupling coefficient (k), as well as the impedance matching values of the WPT system. Following the electrical parameters listed in SAE J2954 RP is crucial to ensure the EV wireless charging system is interoperable. This paper introduces a method for adjusting the effective permeability of the ferrite blocks in the standard model, to tune the self-inductance of the coils as well as the coupling coefficient. To guarantee the given values of the self-inductance of the coil and coupling coefficient matched those in the standard, we slightly modified the air-gap between the ferrite tiles in a specific region. Based on this method, it was possible to successfully tune the self-inductance of the transmitting coil and receiving coil as well as the coupling coefficient. The proposed method was verified by simulation and experimental measurements.

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Section: Proposed Methods To Tune the Self-inductance And Coupling Coefficient By Modifying The Effective Permeabilitymentioning

confidence: 99%

Analysis and Introduction of Effective Permeability with Additional Air-Gaps on Wireless Power Transfer Coils for Electric Vehicle Based on SAE J2954 Recommended Practice

Kim

Huang

et al. 2019

Energies

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“…Using Dual Fourier and Fourier-Bessel transformations in [11], two theoretical models for planar circular and square coils between two multilayer media were proposed taking into consideration several essential parameters like size, thickness of the coils, and permeability of each layer.…”

Section: A Literature Review Of Recent Workmentioning

confidence: 99%

Wireless Power and DATA Transfer to Deeply-Embedded Biosensors in Human Body

Obais¹

2022

IJETAE

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The process of transmitting power from one node to another via physical links without using wires is denoted as wireless power transfer (WPT). WPT plays an important role in medical applications for it offers the possibility of avoiding surgical operations during the replacement of embedded batteries in human body. In this paper, a WPT system for transferring power and DATA to deeply embedded biosensors is proposed. The system is designed such that it is capable of powering a biosensor simultaneously with DATA transmission from a transmitting coil located outside the human body at a distance of 100mm from the biosensor node. The simulation results have revealed the reception of a regulated DC voltage at the biosensor node of 1.2V, which is sufficient to charge a rechargeable embedded battery with an average DC current of 1.1mA. The results also reveal that the proposed system has succeeded in the extraction of the transmitted DATA at the biosensor side within a time of 30µs. The transmitter of the proposed WPT system is driven by a Class-E power source, which has accomplished a drain efficiency of 72% at an overall operating power of 6W. The proposed system is designed and verified on PSpice.

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“…In other words, when the two coils are displaced horizontally or the air gap becomes larger, the mutual inductance between two circular coils has less robustness. Since the square coil can concentrate a larger magnetic field on the four sides and has more overlapped areas, it has a higher tolerance Energies 2021, 14, 2590 2 of 23 for misalignment [2]. A circular wireless charger with an air core is proposed by the author of the paper [3].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Ferrites Structure by Using a New Core-Less Design Algorithm for Electric Vehicle Wireless Power Transfer

et al. 2021

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In order to improve the customers’ continuous usage of electrical vehicles (EVs) and reduce the weight of the energy storage devices, wireless charging technology has been widely studied, updated, and commercialized in recent decades, regarding to its distinct superiority of great convenience and low risk. A higher coupling coefficient is the key factor that impacts the transmission efficiency, thus in most medium-power (hundreds of watts) to high-power (several kilowatts) wireless charging systems, ferrites are used to guide the magnetic flux and intensify the magnetic density. However, the weight of the ferrite itself puts an extra burden on the system, and the core loss during operation also reduces the total efficiency and output power. This paper proposes an optimized design algorithm based on a core-less method for the magnetic core, where the core loss and the coupling coefficient are consequently balanced, and the overall weight and efficiency of the system can be optimized. The iteration procedure is applied on the basis of removed ferrite length and thickness in the algorithm. In the simulation, a square coupler with a total volume of 300 mm × 150 mm, a circular coupler of 150 mm × 150 mm and a Double-D (DD) coupler of 300 mm × 150 mm are used to verify the advantages of the proposed method. The optimized ferrite structures are specific for each coupler shape, and the improvement is proved to be universal in current scale by means of 3-D finite element analysis.

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Theoretical Analysis of Planar Spiral Coils between Two Multilayer Media for Electric Vehicle Wireless Charging

Cited by 5 publications

References 29 publications

Analysis and Introduction of Effective Permeability with Additional Air-Gaps on Wireless Power Transfer Coils for Electric Vehicle Based on SAE J2954 Recommended Practice

Analysis and Introduction of Effective Permeability with Additional Air-Gaps on Wireless Power Transfer Coils for Electric Vehicle Based on SAE J2954 Recommended Practice

Wireless Power and DATA Transfer to Deeply-Embedded Biosensors in Human Body

Optimization of Ferrites Structure by Using a New Core-Less Design Algorithm for Electric Vehicle Wireless Power Transfer

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