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PCB technology provides an alternative to conventional Wireless Power Transfer (WPT) coils made of wound copper wire. The most common wires for conventional coils are either a single wire or a multistranded cable conforming a litz wire structure. On the other hand, the implementation on printed board is suitable for medium-low power applications, presenting advantages as low cost, high repetibility...
Home appliances are responsible of a significant part of residential energy consumption and have a major impact in the overall energetic system efficiency. Most of them perform an indirect ac-dc-ac conversion in order to obtain the required output voltage level and frequency, depending on the applications. Thus, a high-efficiency and power density converter is required for this application where cost-effectiveness...
In this work, a model for induction heating cooktops with non-linear loads is presented. The model includes both the electronic converter and the inductor-pot system, which is usually modeled by its frequency-dependent equivalent impedance. Due to the non-linear relation between the magnetic field and the magnetic flux density in ferromagnetic media, the equivalent impedance of the inductor-pot system...
Induction heating has evolved in recent years towards flexible cooking surfaces with multiple control possibilities. This paper reviews the series resonant multi-inverter topology as a versatile and cost-effective solution for multi-load induction heating systems and analyzes pulse density modulated control strategies with a special focus on the EMC behavior. The main control strategies are explained...
Magnetic hyperthermia is a promising cancer treatment technique based on selectively heating cancer cells to cause their death using the induction heating principles. In order to optimize the magnetic field generator, this paper proposes the design of a high-frequency high-power density inverter taking advantage of the recently developed high-voltage GaN devices and using an insulated metal substrate...
This work presents a method for calculating losses in PCB windings used in multi-coil contactless charging systems. This includes an electromagnetic model which combines analytical developments with FEM simulations in order to calculate the frequency-dependent resistance in a rectangular cross-sectional conductor. The obtained resistance per unit length is then applied to a PCB winding composed of...
Concentric coils are used in domestic induction heating system to improve the range of cookware sizes suitable to be heated up because the coils are switched on or switched off depending on the degree of their covering by the pot. The power is supplied by power converters, typically single-switch or half-bridge inverters, feeding the coils with a medium frequency current. However, the switching frequencies...
The following paper describes the design and optimization method for a small inductor in printed circuit board, which is later used in the implementation of a flexible cooking surface prototype. The method combines an analytical model of an induction system formed by rectangular cross-sectional conductors and Finite Element Analysis (FEA) simulations, providing an important decrease of the computational...
PCB implementation of planar windings replicates the structure of conventional litz wires in order to reduce the ac losses. This structure consists of a set of fine trace electrically connected in parallel which are transposed by means of changes of both trajectory and layer. An appropriate transposition strategy is essential to reduce the winding ac losses, however PCBs with high number of vias could...
The effect of the twisting on the losses of multistranded wires is investigated by means of the combination of a general purpose CAD tool and 3D-FEA simulation. The 3D simulation shows that at bundle level appears both skin and proximity effects which are not usually considered in 2D analyses. These effects generate extra losses in the cable which depend on the helix pitch and the isolation between...
Domestic induction heating enables the pot to be heated directly, reducing heating times and avoiding high-temperature points, increasing safety and cleanliness in the cooking process. In addition, the energy consumption is minimized, reducing the environmental impact. To achieve this, a high frequency current generator is necessary in order to generate the required ac-magnetic field. The efficiency...
Multimedia contents are currently widely extended in higher education due to the generalization of consumer goods which allows the access to these contents. Among others, videos are used to support the learning process with clear advantages because it is well known that the combination of the speaking instruction with image usually enhances the learning. With this purpose, many videos have been built...
In this paper, an elliptic inductor intended to implement low-cost flexible active surfaces for induction cooktops is presented. A 3-D Finite Element Analysis (FEA) platform including the parameterization of the geometry has been developed for simulation purposes. By means of this platform, the main parameters of the induction system, such as the equivalent impedance including the dependence of the...
Resonant converters featuring soft switch on transitions are commonly used in the domestic induction heating application. In this paper, the design and implementation procedure of a high efficiency and high power density resonant inverter for induction heating applications is presented. The proposed converter is based on a multi-MOSFET cell implementation, and the main design challenges including...
In this paper, the design and implementation of small inductors in printed circuit board (PCB) for domestic induction heating applications is presented. With this purpose, we have developed both a manufacturing technique and an electromagnetic model of the system based on finite-element method (FEM) simulations. The inductor arrangement consists of a stack of printed circuit boards in which a planar...
Efficiency is a key design parameter for domestic induction heating systems. To achieve this aim, resonant converters featuring soft switch on transitions are commonly used. In this paper, a cost-effective active snubber circuit is proposed to optimize the switch off transition. This allows the converter to operate under a wide range of operating conditions, with optimized asymmetrical control strategies,...
In this paper, an analysis of the resistance of multi-track coils in printed circuit board (PCB) implementations, where the conductors have rectangular cross-section, for spiral planar coils is carried out. For this purpose, different analytical losses models for the mentioned conductors have been reviewed. From this review, we conclude that for the range of frequencies, the coil dimensions and the...
Switched-mode power supplies applied to induction heating provide conditioned power to a wide range of loads. One of the main issues in the design of these systems is the identification of the main characteristics of the load, i.e. electrical equivalent, as it to be modeled by means of a reduced set of variables. This paper proposes the procedure to extract the electrical equivalent model of the inductor...
One of the most important features of classical induction heaters is the efficiency. Efficiency, defined as the output-input power ratio is directly related with these terms: environmental impact, the total amount of energy required in the cooking process is reduced as efficiency increases; device stress, efficiency determines the amount of dissipated power, and thus, determines the temperature stress...
Domestic induction heating systems are usually modelled as an electrical equivalent composed of the series or parallel connection of an equivalent resistor and inductor. This model allows obtaining useful time-domain results in order to extract design conclusions for the power electronic converter. However, this model neglects the dependence of the equivalent electrical parameters with frequency....
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