Mutual inductance is a key parameter of the inductively coupled circuits such as transformers and contactless energy transfer systems. This particularly required to design power electronics associated with each application. However, its value usually extracted from measurements performed in previously built prototype, which an expensive time-consuming task. In this paper, analysis mutual between two planar circular windings developed. The takes into account effect media that can be part...

Optimization of the efficiency an induction heating application is essential in order to improve both reliability and performance. For this purpose, multistranded cables with litz structure are often used applications. This paper presents analysis optimization systems focusing on optimal copper volume winding respect different constraints. The based concept a one-strand one-turn coil, which captures dissipative effects system reduces number variables analysis. An expression for derived. It...

In this letter, a method to calculate the ac losses, including skin effect and proximity in planar windings with rectangular cross-sectional conductors is proposed. The aim proposing proper losses expressions similar formulas available for round wires, be used calculation of optimization magnetic implemented printed circuit board. proposed model based on decomposition into conduction losses. Conduction only depend properties conductor, whereas are calculated by using orthogonal fields which...

This paper extends a previous formula for the mutual inductance between single-turn coils to include all in air with rectangular cross sections, without any restrictions on dimensions (including overlapping coils). The is compared wide spectrum of examples from literature and agreement excellent every case. Experimental results are presented validate both solenoid disk coils. relevant coreless transformers, inductive coupling, wireless power transfer, leakage resonant converters.

Printed circuit board (PCB) windings are convenient for many applications given their ease of manufacture, high repeatability, and low profile. In cases, the use multistranded litz wires is appropriate due to rated power, frequency range, efficiency constraints. This paper proposes a manufacturing technique semianalytical loss model PCB using planar structure obtain similar ac reduction that conventional round with structure. Different coil prototypes have been tested in several...

Domestic induction cookers are evolving from fixed cooking areas to flexible surfaces in such a way that the pot can be placed at any position. This implies use of larger number reduced-sized inductors, which present lower efficiency. As solution increase efficiency while maintaining flexibility, we propose partially overlapped inductors size. concept is currently wireless power transfer systems, where transmitter arrangement consists several coils. The aim this paper evaluate applied...

This article presents an inductively coupled heating application, that is, a combination of wireless power transfer and induction heating. The addition secondary inductor with resonant capacitor directly beneath attached to the ferromagnetic load allows us improve adaptation loads different sizes primary inductor, enhancing distribution extending distance while avoiding increased losses stress on electronic components. extended can be used implement seamless concept, where typical ceramic...

Wireless inductive power transfer (IPT) systems incorporate magnetic flux concentrators in order to improve some features, as coupling and efficiency, also reduce electromagnetic emissions. Usually, consist of ferrite cores, which are arranged according the size shape pads application. Ferrite is most common material due its optimal balance between performance cost. Despite availability cores with a wide set shapes sizes, applications, matching paths becomes problematic. In this article,...

This article presents the optimization procedure of an inductive power transmission (IPT) system, which utilizes large size spiral printed circuit board (PCB) coils for high-power transfer. PCBs coil assembly provide advantages in manufacturing process through use cost-effective flexible fabrication techniques. Furthermore, this kind construction offers a low-profile device, is great interest applications with space constraints. PCB-based IPT system can achieve high energy efficiency by...

Induction cookers are usually designed to deliver up several kilowatts per burner, working above 20 kHz. These appliances arranged by means of planar-spiral inductors, made conventional multi-stranded litz-wire, whose size can reach tens centimeters. In this work, a PCB implementation such inductors is proposed in order replace the windings, with objective achieving equivalent performance, considering induction efficiency as figure merit. With purpose, finite-element analysis FEA-aided...

The following paper describes the design and optimization method for a small inductor in printed circuit board, which is later used implementation of flexible cooking surface prototype. combines analytical developments with finite element analysis (FEA) simulations, providing an important decrease computational costs. This followed by corresponding calculations order to minimize conduction proximity losses winding optimizing copper volume conductor cross-section dimensions. A parametric...

In this paper, the design and implementation of small inductors in printed circuit board (PCB) for domestic induction heating applications is presented. With purpose, we have developed both a manufacturing technique an electromagnetic model system based on finite-element method (FEM) simulations. The inductor arrangement consists stack boards which planar litz wire structure implemented. PCB minimizes losses similar way to conventional multi-stranded wires; whereas PCBs allows increasing...

We analyze the feasibility of heating non-metallic cookware, unappropriate for by means induced currents, with purpose extending applicability range current induction cooktops. In order to turn materials as glass, ceramic, wood or plastic into suitable technology, we propose use thin layers a metal (not necessarily ferromagnetic material) which can be deposited on surface thick layer technology. For this purpose, inductive performance these is investigated an analytical electromagnetic...

In this work, a model for induction heating cooktops with non-linear loads is presented. The includes both the electronic converter and inductor-pot system, which usually modeled by its frequency-dependent equivalent impedance. Due to relation between magnetic field flux density in ferromagnetic media, impedance of system significantly dependent on excitation level. direction, two common materials have been experimentally characterized their permeability curve wide range levels. Once...

We present a 3-D finite element analysis (FEA)-based model of elliptic coils. The type coil addressed in this paper is the constant-turn density coil, which corresponds to practical implementations flat or solenoid-type coils wound on an ellipse-shaped bobbin. assume consisting constant current perpendicular cross section along trajectory. This covers dc operation and ac applications with multistranded litz wires. condition implemented FEA tool by gradient winding function vector trajectory...

We evaluate copper tubes as alternative of litz wire for planar coils inductive power transfer (IPT) systems. For this purpose, a design methodology focused on maximizing the product magnetic coupling and quality factor is proposed. The based combination FEA simulations analytical calculations skin proximity losses in tube. Analytical are solutions Maxwell's equations tubular geometry. These oriented to extract both Performance prototype 1.5 kW evaluated compared with conventional litz-wire...

Litz wires with large number of strands are usually manufactured by twisting several bundles a moderate strands. Apart from manufacturing advantages, this technique also provides extra characteristics as current balancing between and, consequently, power loss and optimal use cross sectional copper area. However, complex configurations carry analysis, modeling design problems which make choosing the parameters particular arrangement difficult. A complete 3D finite element model that...

PCB implementation of planar windings replicates the structure conventional litz wires in order to reduce ac losses. This consists a set fine trace electrically connected parallel which are transposed by means changes both trajectory and layer. An appropriate transposition strategy is essential winding losses, however PCBs with high number vias could result expensive not reliable. Taking advantage field profile windings, this work studied minimization without significant reduction...

We present a semianalytical model for calculating the forces exerted on cookware in domestic induction heating applications. The developed is based Maxwell's stress tensor and also existing semianalytic expressions of electromagnetic fields planar systems, which are expressed terms Fourier-Bessel series. Taking advantage axial symmetry usual flux vertical component analytically integrated force obtained. proposed captures both eddy currents magnetization that occurs typical ferromagnetic...

Improving the cooking experience of induction-heating users involves, among other factors, an optimized power distribution at bottom vessel. Conventional ferromagnetic cookware presents high efficiency but unequal temperature with flat inductors, which subsequently leads to uneven results. In this work, we propose alternative traditional arrangement by inserting some aluminum pieces in cookware. This combines optimal inductive performance iron thermal conductivity aluminum. The proposed is...

In this article, a hybrid wireless power transfer system, which combines induction heating (IH) and inductive functionalities, is proposed to improve the performance of domestic IH application with small loads weakly coupled distant inductors. Considering basic single-inductor application, system adds secondary inductor series compensation capacitor directly attached ferromagnetic cookware. The extended distance can be used implement glassless concept, where ceramic glass typical cooktops...