Efficient Multiport Equivalent Circuit for Skin and Proximity Effect in Parallel Conductors With Arbitrary Cross Sections

Bednarz, Christian; Schreiber, Hannes; Leone, Marco

doi:10.1109/temc.2018.2789998

Cited by 11 publications

(6 citation statements)

References 12 publications

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“…According to Equation (3), when the input voltage at the transmitting end is fixed, the received power of the load is mainly affected by the mutual inductance M, the equivalent load, and the internal resistance parameters of the system. When the resonant frequency is increased, the influence of the stray parameters of the coil itself (such as skin effect [27], impedance deviation etc.) will become more apparent.…”

Section: Design and Optimization Of Wireless Power Supply Systemmentioning

confidence: 99%

Design and analysis of wireless power supply system for high‐voltage transmission lines across 500‐kV insulator distance

Tan

Zhi-jun

Shen

et al. 2023

IET Power Electronics

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The energy harvesting of ultra‐high voltage transmission lines and wireless power transmission technology are effective means to solve the stable energy supply of outdoor tower equipment. However, there are inevitably technical problems such as long transmission distance, weak coupling, and parameter sensitivity. In this paper, an effective design approach for a power demand‐oriented long‐distance wireless power transmission system is proposed. With the goal of transmitting power, a system equivalent parameter model is established to address the sensitivity of design parameters for the point‐to‐point long‐distance wireless power transmission system, and the main influencing factors that lead to system power transmission failure are analyzed. To effectively address the impact of high‐sensitivity parameters, a fast‐tuning method with redundant capacitance matrix compensation is proposed, which improves the deviation problem in system parameter design, improves the efficiency of offset parameter matching, and analyzes the impact of wireless energy transmission systems on high‐voltage insulator strings. Finally, an experimental platform was constructed to achieve power transmission at a distance of not less than 5 m at a resonant frequency of 50 kHz. The transmission efficiency met the design expectations and verified the effectiveness of the analysis.

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Section: Design and Optimization Of Wireless Power Supply Systemmentioning

confidence: 99%

Design and analysis of wireless power supply system for high‐voltage transmission lines across 500‐kV insulator distance

Tan

Zhi-jun

Shen

et al. 2023

IET Power Electronics

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show abstract

“…Avoiding empirical approximation formula, we set up the equivalent circuit model of Fig. 3, similar to the approaches of [39] and [40]: In each turn x of the coil, n f circular conductor filaments of index y, radius r f,xy , height h f,xy within the conductor and rectangular cross section A f,xy carry a current I f,xy and are subject to ohmic losses according to the DC resistance formula [41, p. 755]…”

Section: ) Resistancementioning

confidence: 99%

“…The height h f and width w f of the filaments defined in Fig. 3 have to be smaller than the skin depth δ = √ 2ρ/(µ 0 ω) in order to sufficiently resolve the current distribution within the conductor [40]. Computational efficiency can be enhanced using non-uniform values of h f and w f across the conductors' cross sections [33].…”

Section: ) Resistancementioning

confidence: 99%

Efficient Wireless Power Transfer With Capacitively Segmented RF Coils

et al. 2020

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Wireless power transfer systems have been widely applied in the field of portable and implantable devices, featuring contact-free and reliable energy supply. Novel implant systems, such as brain-computer interfaces, impose the challenges of strong miniaturization and operation under loosely coupled conditions. Therefore, maximizing power transfer efficiency while decreasing the size of transmitter and receiver structures becomes a central research question. This paper presents a unified design strategy of modeling, analyzing and optimizing planar spiral coils with integrated capacitive elements, so-called capacitively segmented coils, for operation in wireless power transfer interfaces. It mathematically analyzes and experimentally verifies that the combination of capacitive coil segmentation, increased operational frequencies and geometrical coil optimization can be used to establish wireless power transfer links with comparatively high efficiency, small size and limited detuning effects in lossy dielectric environments. The paper embraces the formulation and verification of a broadband analytical link model based on partial element equivalent circuits, which is subsequently used to determine dominant coupling and loss mechanisms and to optimize the coils' geometries for high efficiency. Moreover, an extended analysis shows how the capacitive coil segmentation can effectively suppress dielectric losses and non-uniform current distributions by canceling the inductive contribution of every coil segment at the frequency of operation. Utilizing these methods, an exemplary 40.68 MHz wireless power link with a 30 mm primary and a 10 mm secondary coil is designed and evaluated: With a maximum efficiency of up to 31 % in biological tissue at 20 mm separation distance, it features efficiency levels which are up to ten times higher and a specific absorption rate which is up to five times lower compared to non-segmented systems. When operated at 150 MHz in air, efficiency levels are up to 1.5 times higher than in state-of-the-art systems of the same size.

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“…The knowledge of the charge distribution of a generic geometry of the conductor can allow for a better designing the conductor geometries and for reducing the possibility of occurrence of electrostatic discharge [17]- [19] A typical example is a capacitor considered as two infinite metallic foils separated by a distance d. This idealization of a capacitor does not take into account the intense electric field generated near the edges of the conducting surfaces. The problem of electrostatic forces between two finite-size conductors of different geometries has been investigated in several works [20]- [24]. Recently, in Ref.…”

Section: Introductionmentioning

confidence: 99%

Perturbative Approach for the Analysis of Charge Distribution on Arbitrarily Shaped Conductors

et al. 2021

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In this paper, we analyze the electrostatic charge distribution on arbitrarily shaped conductor surfaces. Following a perturbative approach, we derive an approximate analytical formulation of the problem. We start from the known case of a conducting ellipsoid, we adopt a deformed ellipsoidal coordinate system, and we search for the zero-order approximated solution of the problem. We also focus on arbitraryshaped thin foils, showing that the charge density is divergent on their borders. We then define the applicability range of the proposed approach expressing the contour equation as the Fourier series. Finally, we present a detailed error analysis for several polygonal contours, comparing the analytical results with those obtained via a numerical analysis based on the Finite Element Methods (FEM).

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Efficient Multiport Equivalent Circuit for Skin and Proximity Effect in Parallel Conductors With Arbitrary Cross Sections

Cited by 11 publications

References 12 publications

Design and analysis of wireless power supply system for high‐voltage transmission lines across 500‐kV insulator distance

Design and analysis of wireless power supply system for high‐voltage transmission lines across 500‐kV insulator distance

Efficient Wireless Power Transfer With Capacitively Segmented RF Coils

Perturbative Approach for the Analysis of Charge Distribution on Arbitrarily Shaped Conductors

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