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The performance of induction cooktops (inductor and electronic power converter) is closely related to the inductive properties of the cookware used. Traditionally, they are designed to work optimally with fully ferromagnetic cookware. However, multimaterial cookware with a bottom surface composed of a ferromagnetic material and small pieces of alum...
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... induction cooktop typically comprises the power electronics converter and the inductor-load system. As illustrated in Fig. 1, to facilitate the collaborative design of the converter and induction system, the inductor-load system is electrically modeled as an equivalent resistance R eq connected in series to an equivalent inductance L eq , where the R eq represents the power dissipated, and L eq represents the magnetic field of the system [15], [16]. The ...
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... inductor-load system usually consists of the cookware, the inductor, the ferrites, and the aluminum shielding. It can be electrically modeled using the equivalent circuit shown in Fig. 1. The circuit parameters, R eq and L eq , depend on several factors, which include the number of turns of the coil, the geometry and diameter of the coil, the arrangement and size of the ferrites, the geometry and electromagnetic properties of the cookware, and the operating frequency, among others ...
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... used intersects differently with the cookware (Fig. 4), a different χ ins has been used in (4) and (5) for the calculation of the equivalent electromagnetic properties. χ ins =0,23 in the inductor with ϕ =145 mm and 24 turns, χ ins =0,37 in the inductor with ϕ= 180 mm and 19 turns and χ ins =0,35 in the elliptic inductor with 22 turns. In Fig. 10, the comparison between R eq (a) and L eq (b) measured and calculated with the equivalent model is shown. It can be observed that the results obtained experimentally with the different inductors agree with those obtained with the equivalent model. The other experiment has been carried out with the prototype shown in Fig. 9(b) on an ...
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... of aluminum inserts can be varied. In this experiment, several measurements have been performed using the same amount of aluminum inserts but distributed in different ways along the cookware's surface, validating that the model is a good approximation regardless of the distribution of the inserts. The results of this experiment are shown in Fig. 11. In it, 22 inserts of aluminum, marked in red, and the rest of the same material as the base have been distributed in four ways (Fig. 11(c)). Each insert has a diameter of 8 mm, so the twenty-two inserts correspond to a χ ins of 0.1276. As can be seen from the experimental results, the variation in the position of the aluminum inserts ...
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... inserts but distributed in different ways along the cookware's surface, validating that the model is a good approximation regardless of the distribution of the inserts. The results of this experiment are shown in Fig. 11. In it, 22 inserts of aluminum, marked in red, and the rest of the same material as the base have been distributed in four ways (Fig. 11(c)). Each insert has a diameter of 8 mm, so the twenty-two inserts correspond to a χ ins of 0.1276. As can be seen from the experimental results, the variation in the position of the aluminum inserts has hardly affected the equivalent resistance and inductance. Like in the previous experiment, the agreement between the model and the ...
Citations
... A typical power supply for the studied load is a voltage source inverter that generates an output voltage in the form of a square wave. This voltage can be expanded into a Fourier series where its selected normalized harmonic rms value is described by (5). Using (1) and (5), normalized power (6) is determined. ...
This paper presents new resonant inverter topologies for dual-frequency induction heating (IH). These 2T1C and 3T topologies combine the advantageous features of two- and one-inverter solutions. An analytical description of the load impedance of a dual-frequency series-parallel circuit has been made. Using manufacturer datasheets and LTspice models of selected transistors, a MATLAB model was parameterized. Based on it, power losses are determined as a function of the following parameters: nominal power, frequency and DC bus voltage. The obtained results allowed for determining the data necessary in the design process. The research has been experimentally verified. Tests were carried out for pulsing and simultaneous operation. Power control characteristics as a function of frequency are determined. The possibility of operating the inverter with high efficiency (>97%) in the proposed 2T1C and 3T systems at nominal power is demonstrated.
The analysis of the magnetic properties of alloys with low Curie temperature used in domestic induction heating is presented. These alloys allow the development of cookware with additional benefits with respect to regular cookware oriented to improve temperature control and the user’s safety. Firstly, an experimental method to characterize the magnetic permeability with respect to the magnetic field strength and temperature in the material is presented. Secondly, a finite element simulation method is proposed which, considering the previous characterization, allows the calculation of the electrical equivalent of an inductor-load system as a function of temperature and magnetic field. This method makes possible the application of finite element simulation in the frequency domain with nonlinear materials, which is of interest for the design of electronics associated with domestic applications of induction heating. Simulation results are experimentally verified with various ferromagnetic alloys with low Curie temperature at different power, temperature, and operating frequency ranges.
Growing need for non-renewable energy, like petroleum, and its extraction challenges urge scientists to prioritize renewable resources for sustainable energy. Extensive research is addressing domestic LPG overconsumption and energy-saving. This study focuses on enhancing energy efficiency by adding fins to the bottom of specific cookware. To achieve this goal, a study involves the analysis of up to five stainless steel cookwares, each equipped with a unique fin setup designed to enhance thermal efficiency, raise temperatures more effectively, reduce gas consumption, optimize gas flow rates, and assess various dimensionless numbers. Results shows that among all the five cookwares, Cookware 3 (CW3) outperformed by showing the thermal efficiency of 61.5% to the gas flow rate at 15.27 mL s−1. This modified cookware showed an improved thermal efficiency (4.065% at gas flow rate of 15.27 mL s−1) when compared to the performance of a normal cookware with no fin arrangement present. In addition, the experimental data are validated using ANSYS Fluent software and MATLAB platform with Deep Neural Network-based Binary Bat algorithm (DNN-BBA). The results of the DNN-BBA technique showed a strong correlation with the actual results for temperature increase, thermal efficiency, gas consumption, Nusselt number, Prandtl number, and Rayleigh number. Additionally, the present study is able to maintain the burner's thermal efficiency at a higher level of 3%, compared to the previous study which achieved 2.5%.
