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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...
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 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...
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...
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...
Detection of emotion in humans from speech signals is a recent research field. One of the scenarios where this field has been applied is in situations where the human integrity and security are at risk. In this paper we are propossing a set of features based on the Teager energy operator, and several entropy measures obtained from the decomposition signals from discrete wavelet transform to characterize...
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...
Digital control has significantly advanced in the last decade enabling the implementation of higher performance controllers using digital devices such as microcontrollers, DSPs or FPGAs. The design and implementation of controllers using FPGAs is often a challenging and time-consuming task. In order to improve this process, high level synthesis tools allow the use of high-level programming languages,...
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...
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...
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,...
This paper analyzes the extended describing function technique (EDF) for modeling a resonant power converter applied to induction heating applications. Since in this specific application operating conditions may be far from resonance, this paper is focused on extending the model to several harmonics and verifying its validity range. The main goal is to obtain accurate control-to-power transfer functions...
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...
This paper presents a second-order sigma-delta (ΣΔ) analog-to-digital converter for measuring magnitudes of interest in power converters. The ΣΔ modulator has been implemented using discrete components and the digital system is embedded in an FPGA. The desired signal is extracted from the bit-stream output of the ΣΔ modulator by a digital low-pass filter structure. An optimized structure is proposed...
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 power control strategy focused on improving the efficiency of induction heating appliances is presented. This strategy uses the distance between the inductor and the load as a control parameter, which is combined with the switching frequency of the resonant inverter. Therefore, a study of the efficiency of the involved subsystems is carried out. From these analyses, the theoretical...
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