Application of Average Electrothermal Models in the SPICE-Aided Analysis of Boost Converters

Górecki, Krzysztof; Detka, Kalina

doi:10.1109/tie.2018.2847694

Cited by 35 publications

(52 citation statements)

References 27 publications

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“…An automated measurement system for core loss characterization is proposed in [22], where the attention is focused on transformers and inductors for SMPS. The heat generation and thermal model issues are discussed in [23] and [24], considering the inductor operated in the linear zone. A commercial system has been developed for testing inductors in quasi-real operating conditions exploiting a DC-bias current generator and a triangular current ripple generator placed in parallel with the inductor under test [25].…”

Section: Introductionmentioning

confidence: 99%

“…Differently from [18], the proposed approach can be generalized for power inductors; it is cheaper compared to [22], which uses a temperature chamber, and a commercial system such as [25] and can be built for laboratory purposes. The inductor thermal behavior and modeling are relevant to the DC/DC converter design [23], [24]. Our contribution addresses this issue since the characterization always takes into account the temperature measured on the core.…”

Section: Introductionmentioning

confidence: 99%

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Non-Linear Inductors Characterization in Real Operating Conditions for Power Density Optimization in SMPS

Scirè¹,

Ventimiglia²,

Lullo³

et al. 2023

Preprint

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The exploitation of power inductors outside their linear region in switching converters can be achieved by raising the current until a decreasing of the inductance can be noticed. It allows using a smaller magnetic core increasing the power density of the converter. On the other hand, a detailed description of the magnetization curve including the temperature is required. Since this information is often not included in the inductor’s datasheets, this paper shows how to identify the behavior of an inductor when it is operated up to saturation and its temperature rises. In order to characterize the inductor in real operating conditions, a dedicated measurement rig has been developed. It consists of a switching converter that encompasses the inductor under test and is controlled by a virtual instrument developed in LabVIEW. The characterization system was tested by retrieving the inductance and the magnetization curves vs. current for two commercial inductors at core tem-peratures up to 105°C. The magnetic core is then characterized by the saturation current versus inductance, obtaining an expression for the whole family of inductor sharing the same core. Finally, we analyzed experimentally the thermal transient of the inductors in operating conditions con-firming the fundamental role of temperature in changing the current profiles and the core saturation condition.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Non-Linear Inductors Characterization in Real Operating Conditions for Power Density Optimization in SMPS

Scirè¹,

Ventimiglia²,

Lullo³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Ref. [6] proposes an electrothermal model of the inductor to analyze a boost converter; it highlights that an accurate knowledge of losses in the inductor is required. The same authors explain in [7] how losses in the inductor influence the converter performance, whereas [8] proposes a 2-D model of the inductor to reduce the computational load.…”

Section: Introductionmentioning

confidence: 99%

“…The paper differs from [5,13] and from [8] since it proposes a model of the inductor based on a polynomial curve; this approach is similar to [20], but here it is improved taking into account ohmic and magnetic losses. With respect to [6], here the thermal analysis considers the non-linearity of the inductor. Finally, the analysis is explained by a mathematical model with block diagrams to make the implementation easier by a graphic interface, such as MATLAB ® Simulink.…”

Section: Introductionmentioning

confidence: 99%

Thermal Stability of a DC/DC Converter With Inductor in Partial Saturation

Vitale

Lullo

Scirè

2021

IEEE Trans. Ind. Electron.

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Inductors operated in quasi saturation in DC/DC converters allow reduction of the core size and realization costs; on the other hand, they imply an increase of dissipated power that can jeopardize the thermal stability of the converter. In this paper, this issue is studied by a mathematical model able to represent both the inductor non-linearity and its temperature dependence. The main losses, such as ohmic, skin effect and magnetic, are taken into account in the model. The inductor is characterized by a polynomial curve whose parameters are a function of the temperature. Finally, the whole converter is modeled and simulation results, obtained on a boost converter, are compared with experimental measurements showing that the thermal behavior is reproduced in detail.

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“…On the other hand, in Reference [26], the average electrothermal model of an inductor was described; it took into account the dependence of power losses in ferromagnetic materials on frequency and temperature. The investigations were carried out for the boost converter.…”

Section: Introductionmentioning

confidence: 99%

Influence of Power Losses in the Inductor Core on Characteristics of Selected DC–DC Converters

Górecki

Detka

2019

Energies

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The paper presents the results of a computer simulation illustrating the influence of power losses in the core of an inductor based on the characteristics of buck and boost converters. In the computations, the authors’ model of power losses in the core is used. Correctness of this model is verified experimentally for three different magnetic materials. Computations are performed with the use of this model and the Excel software for inductors including cores made of ferrite, powdered iron, and nanocrystalline material in a wide range of load resistance, as well as input voltage of both the considered converters operating at different values of switching frequency. The obtained computation results show that power losses in the inductor core and watt-hour efficiency of converters strongly depend on the material used to make this core, in addition to the input voltage and parameters of the control signal and load resistance of the considered converters. The obtained results of watt-hour efficiency of the considered direct current (DC)–DC converters show that it changes up to 30 times in the considered ranges of the mentioned factors. In turn, in the same operating conditions, values of power losses in the considered cores change from a fraction of a watt to tens of watts. The paper also considers the issue of which material should be used to construct the inductor core in order to obtain the highest value of watt-hour efficiency at selected operation conditions of the considered converters.

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Application of Average Electrothermal Models in the SPICE-Aided Analysis of Boost Converters

Cited by 35 publications

References 27 publications

Non-Linear Inductors Characterization in Real Operating Conditions for Power Density Optimization in SMPS

Non-Linear Inductors Characterization in Real Operating Conditions for Power Density Optimization in SMPS

Thermal Stability of a DC/DC Converter With Inductor in Partial Saturation

Influence of Power Losses in the Inductor Core on Characteristics of Selected DC–DC Converters

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