Nowadays, wireless power transfer (WPT) has attracted great attention from researchers because it is a safe, convenient, and reliable way to recharge electric vehicles. Square circular coils are most commonly used in WPT systems. However, there few analyses of comparing these two geometry windings detail. In this paper, analytical models both square planar spiral between semi-infinite substrates developed based on Fourier-Bessel transformation dual Fourier transformation. An calculation the...

In this article, a self-tuning <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LCC/LCC</i> wireless power transfer system based on switch-controlled capacitors is proposed to maintain high factor the primary inverter side and fixed output secondary against self or mutual inductance variation of magnetic coupler. The PI control method gradient descent are normalized mistuned circuit model. Only two each used implement scheme without Wi-Fi...

The ferrite core plays an essential role in coupling enhancement and magnetic shielding for the wireless power transfer of electric vehicles. However, has apparent defects, such as a low saturation brittleness, especially at vehicle side. Therefore, novel flexible nanocrystalline is proposed this article, which high flexibility limits. large eddy current under 85-kHz excitation, so refinement crushing process alternating seamless stitching are adopted to reduce loss. feasibility improvement...

This article proposes a multiobjective optimization method of primary double-D pad for inductive power transfer systems. First, parametric sweep analysis is conducted to choose the crucial design parameters. Then, using nondominated sorting genetic algorithm II, structure can be optimized based on two key objectives; ensuring good coupling coefficient while minimizing worst-case stray leakage magnetic fields. Several useful guidelines are found from results, including how dimensions both...

Fe-based nanocrystalline ribbon is an alternative to the ferrite for high-frequency magnetic cores due its low hysteresis loss and high saturation. The drawback of conductivity. Crushing homogenous restructure a flake (NFR) can reduce conductivity while maintaining other superior properties noncrushed ribbon. So far, several previous works have proven that NFR replace in dual active bridge wireless power transfer system. However, seldom these mention detailed mechanism NFR. In this article,...

This letter reports characterization of the novel nanocrystalline flake ribbon (NFR) soft magnetic material. The comparative analysis among ferrite N87, N27, and NFR is presented at different temperature, frequency, peak flux density, respectively. Experimental results prove that has lower loss higher density saturation, better temperature stability from 85 to 300 kHz. A <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LCL</i> resonant tank...

Inductors are the essential components in electronic devices, but nonuniform magnetic flux density distribution (MFDD) toroidal cores will lead to premature saturation and reduced material utilization. To address this problem, we propose a nanocrystalline core with permeability gradient (PG) along radius direction. The of flake ribbon (NFR) can be easily adjusted through physical crushing process, providing fabrication condition for PG-NFR core. influence sublayer number PG simulated...

The bipolar pad is one of the most promising topologies in inductive power transfer (IPT) systems for electric vehicles. However, there scant literature on analytical model pad. In this article, a three-dimensional (3-D) IPT system including transmitter and square receiver developed based superposition two 2-D subdomain models. Ferrite aluminum shields with finite dimension are taken into account sides. An calculation mutual inductance then carried out respect to main parameters system,...

This paper presents an analytical approach for calculating the magnetic field distribution excited by planar spiral circular coil and square wireless power transfer (WPT) system. Based on Biot-Savart principle, spatial flux density can be computed mutual inductance of coils is calculated numerical integrals with all possible variations misalignments. The calculation results are validated finite element analysis. At last, comparison between elaborated.

In this article, an exciter–quadrature–repeater transmitter pad is proposed in order to achieve high lateral misalignment tolerance and low leakage flux emission electric vehicle wireless charging applications. the WPT system, a single half-bridge inverter unit needed energize exciter coil, which magnetically coupled two larger quadrature repeater coils. The currents coils naturally adjust based on of receiver reduce density around zone. system can maintain zero phase shift between...

Wireless/contactless charging of electric vehicles can improve the safety and convenience vehicle process. However, in order to enable wireless on an vehicle, additional components need be added which increase cost, weight vehicle. Specifically, a receiver coil power electronics are required receive charge battery. This work proposes new integrated charger, reuses existing drivetrain components, such as traction inverters motor, serve receiver-side for charging. Importantly, this topology...

A three-coil decoupled transmitter is developed for the inductive power transfer system of electric vehicle charging. The consists three overlapping rectangular coils with magnetic mutual decoupling and capable overcoming large receiver lateral misalignment up to 20 cm. current optimization method advanced derive coil currents multi-phase that minimizes loss through optimizing distribution among coils. optimized reduces maximum leakage flux by around 40% compared best alternative excitation...

In this article, an 11-kW wireless charging system based on the <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LCC</i> -serial–parallel (SP) topology utilizing power control of a current doubler is established. The circuit characteristics -SP are analyzed. Furthermore, equivalent quality factor introduced to analyze harmonic problem system. Meanwhile, impedance derived by Fourier decomposition. Then, compensation parameters modified...

Abstract Power transformer is widely used in the power system with rapid development of converters connected to grid. When a operates under DC bias conditions, its iron core loss increases significantly, causing local overheating and threatening proper operation transformer. However, there are persistent difficulties accurately assessing when induction waveform influenced by bias. This paper first proposes improvements J–A Preisach models evaluate Additionally, we incorporate hysteresis into...

This article introduces a toroidal nanocrystalline powder core with trapezoidal cross section. The nonuniform magnetic flux distribution of cores different cross-sectional geometries is discussed, the inductance equations are derived, and geometrical optimization factor given in order to retain highest possible value while minimizing material usage. A ten-turn coil wound on core, measured values showing good match both finite element method (FEM) mathematical calculation. near-field...

Abstract The investigation on the constant current (CC)/constant voltage (CV) charging for electric vehicle wireless power transfer (WPT) system has been widely conducted. However, CC/CV performance under misalignment cases scarcely studied especially multi‐coil WPT system. resonant tank compensation methodology exciter‐quadrature‐repeaters (EQR) transmitter‐based is to achieve high factor with low leakage flux over ±150 mm lateral range. EQR transmitter consists of one small exciter coil...

Square and circular coils are two typical topologies for coupling applied to wireless charging. However, most of the research on is based finite element model (FEM), which a time-consuming process 3-D structure coils. In this paper, basis Fourier–Bessel transformation Dual Fourier transformation, theoretical models square between multilayer media proposed. With proposed models, we consider several important parameters such as size coils, thickness, permeability each layer. Thus, both...

This paper proposes a multi-objective optimization method of the primary double D coils for wireless charging system based on Non-dominated sorting genetic algorithms II (NSGA-II). The result provides several useful design rules are concluded regarding how dimensions both coil and ferrite layer affect coupling leakage. A practical level 2 defined by SAE J2954 is used as reference starting point optimization. Finally, one structure from chosen validation using finite element method.

Compact and high current inductors determine the power density efficiency of voltage regulators (VRs) for computing ICs.Conventional moulding structures using powder cores gapped ferrite are reaching limits size miniaturisation.In this paper, a sandwich-structured inductor 2D magnetic nanocrystalline flake ribbon (NFR) is developed to achieve low height.The analytical models inductance conduction losses validated by finite element methods experiments.A 5 1 V, 50A, VR built compare...

Fe-based soft magnetic material such as amorphous or nanocrystalline alloy is an alternative to the ferrite for cores of medium-frequency transformers (MFT) due its high permeability and saturation. However, accurate core loss modelling one major obstacles design a highpower-density MFT, especially when considering nonlinearity hysteresis B-H loop. Besides, magnetostriction that exhibits characteristic causes vibration issue. Several studies have proven intensity acoustic noise will do harm...