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This paper presents a design method for domestic induction systems whose winding is considerably farther from its load. To this end, a parametrized finite element model is used to ascertain the system's parameters. This model is used to test variations in frequency, inductor-load distance and inductor diameter. From simulation results, efficiency, output power, power loss volumetric density and near...
Electrosurgical units are one of most relevant biomedical applications of power electronics used worldwide. Recent advances in power converter topologies and devices enables the design of new systems with improved performance, potentially improving surgical procedures. This paper proposes a boost converter topology featuring GaN devices in order to provide a high-frequency highly-versatile electrosurgical...
This paper presents a multiple-output resonant inverter for multi-coil systems featuring high efficiency and flexible output power control for modern induction heating appliances. By adopting a matrix structure, the number of controlled devices can be reduced to the square root of the number of controlled induction heating loads. Therefore, an elevated component count reduction can be achieved compared...
Induction heating is a contactless highly-efficient technology with a major social and economic impact due to its benefits in terms of performance, efficiency, safety and control. In order to further develop this technology, advances in power conversion, digital control and magnetic component design are pursued. This paper proposes the use of GaN devices which perfectly matches the voltage and current...
Adaptable cooking surfaces are at the forefront of design trends because of the many advantages offered to users. These improvements and advantages have their counterpart in the increased design challenges related to inductors and power electronics. Shifts in the relative position between the pan and the inductor may cause the inductor to be totally or partially uncovered, leading to changes in the...
Induction cookers are usually designed to deliver up to several kilowatts per burner, working above 20 kHz. These appliances are arranged by means of planar-spiral inductors, made of conventional multi-stranded litz-wire, whose size can reach up to tens of centimeters. In this work, a PCB implementation of such inductors is proposed in order to replace the conventional windings, with the objective...
The inductive characteristics of graphite thin slabs are investigated with the objective of designing convenient loads for domestic induction heating uses. For this purposes it is defined a figure of merit consisting of the increment of the resistance of a loaded planar coil with respect to the resistance of the coil in the air. The equivalent resistance of the coupled coil-slab system is obtained...
This paper presents an evaluation of a SiC MOSFET-JFET n-ON cascode structure for induction heating home appliances. In particular, the SiC cascode is applied in a resonant half-bridge inverter (HB-SCR). The cascode under test is comprised of a high power JFET n-ON in series with a low voltage MOSFET with a reduced conduction resistance. This small signal auxiliary device controls the conduction status...
This paper presents an analysis of the intermodulation (IMD) distortion products that appear in a dual one-switch-zero-voltage-switching (1SW-ZVS) resonant inverter. The converter switching frequencies, and therefore output power for each burner, are currently not independent of each other consequently audible noise appears. With this analysis and the increased operation frequency range obtained with...
This paper presents a half-bridge SiC resonant inverter applied to induction heating for domestic appliances. The main objective of this work is to evaluate a SiC normally-ON VJFET as this device is commercially available. Two different references of this nO-JFET have been tested. This design is focused in the extension of the usable frequency range and efficiency over the parameters typically achieved...
Induction heating (IH) technology is nowadays widely present in domestic appliances because of its cleanness, high efficiency, and faster heating times. All of these advantages are due to its heating process, where the pot is directly heated by a varying magnetic field. As a result, the glass where the pot is supported is not directly heated and, consequently, efficiency and heating times are improved...
In this paper, a method to calculate the ac losses (including skin effect and proximity losses) in planar magnetic devices having rectangular cross-section conductors is presented. A similar model to that employed in the losses calculation with round wires is developed for the mentioned conductors. The aim is to obtain a proper design procedure, especially for magnetic devices in printed circuit board...
This paper proposes a computational model of an inductor system composed of two concentric coils connected each one to a half-bridge inverter. In the first step, the equivalent self-impedance of each coil and the equivalent coupling impedance between coils is obtained from numerical simulations performed by using a commercial FEA tool taking into account the frequency dependence exhibited by the induction...
Collaboration between Industry and University is becoming more important in order to improve the competitiveness of the research and development activities. Moreover, establishing synergies to bridge the gap between the academic and industrial spheres has demonstrated to be advantageous for both of them. Nowadays, Industry is moving towards an open innovation structure, in which external agents as...
Quasistatic approach provides intermediate level of electromagnetic theory in between statics and the full set of Maxwell equations. This approach is introduced in the electrical engineering undergraduate courses due to its pedagogical significance. In standard textbooks, quasistatic approach refers to a regime where the system size is small with respect to the electromagnetic wavelength associated...
Domestic induction hobs with adaptable-size burners are under development in order to improve the flexibility of the apparatus by adapting the active area to the size of the vessel. Such burners are implemented by means of several small ring-type closely-arranged coils, each one of them supplied by a resonant inverter. Its activation depends on the size and the shape of the pot. The basic winding...
Operation under light-load conditions is a general issue when developing power converters, as it can lead to system instability and/or decreased performance. This topic is especially important for resonant converters, as the efficiency significantly degrades when the operation point is set out of the resonant conditions. Considering the importance of efficiency for the power converter reliability,...
Adaptable-diameter inductors are being implemented in domestic induction hobs in order to increase the range of suitable pot's diameters and to achieve a better use of the installed power electronics. Such inductors are arranged by means of several concentric planar windings, usually up to two or three units, each one of them comprising several Litz-wire turns. Normally, one resonant inverter is dedicated...
Designing the converter for an induction cooker, the main difficult lies in the variability of the load, due to the wide range of vessels available in the market. Such issue is equivalent to the problem of identifying the vessel's properties. In this paper an identifying method of such properties is proposed with the objective of system-level simulation and design. The method is based on a combination...
Domestic induction heating systems exhibit temperature dependence on its main characteristics. In the past, analytical expressions of the equivalent impedance and efficiency were derived for a constant temperature planar inductor coil system. In this paper, extended expressions including thermal effects are proposed and, finally, experimentally validated by means of measurements and a FEM simulation.
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