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

Vitale, G.; Lullo, G.; Scirè, Daniele

doi:10.1109/tie.2020.3014580

Cited by 27 publications

(24 citation statements)

References 29 publications

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“…This causes a slow increase of the current ripple, as shown in Figure 10. This phenomenon is much more evident when the inductor works in partial saturation, as clearly shown also in the thermal analysis performed by Scirè et al 32 As described in detail by Vitale et al, 31 the increase of the ripple leads in turn to a further increase of the temperature, resulting in a positive feedback, which may cause a thermal collapse of the inductor, in the absence of protection systems.…”

Section: Switch Mode Power Suppliesmentioning

confidence: 70%

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Nonlinear models of power inductors: A survey

Oliveri

Lodi

Storace

2021

Circuit Theory & Apps

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Summary Switch‐mode power supplies (SMPSs) are widely exploited to interface electrical energy sources to motors and other electrical loads. Inductors are usually the biggest and heaviest components in SMPSs, limiting their overall power density. Therefore, there is an increasing interest in designing SMPSs with partially saturating inductors, because this significantly reduces their weight and size, thus increasing power density. This paper provides a review of nonlinear behavioral models (based on easy‐to‐measure quantities) of the inductance, power loss, and temperature rise of inductors working, at least partially, in magnetic saturation. This survey discusses the pros, cons, and ranges of validity of these models, with a glimpse at their application to SMPS simulation, design, monitoring, and control.

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Section: Switch Mode Power Suppliesmentioning

confidence: 70%

“…This thermal transient is much slower than the electrical one and can last up to tens of minutes, depending on the thermal characteristics of the inductor. A dynamical dependence of the temperature rise on the power loss can be adopted to mimic this behavior, 31

R_{t h} C_{t h} \frac{d T_{r i s e}}{d t} + T_{r i s e} = R_{t h} p,

being C th a thermal capacitance.…”

Section: Switch Mode Power Suppliesmentioning

confidence: 99%

Nonlinear models of power inductors: A survey

Oliveri

Lodi

Storace

2021

Circuit Theory & Apps

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“…Firstly, the parasitic resistance of the inductor is calculated; then, the temperature is brought to the set value by powering the DC/DC converter until the desired temperature is reached. Based on the geometrical characteristics of the core and on the material, its temperature can be assumed constant; for this reason, a thermochamber is not required [9]. The inductance evaluation is repeated for increasing DC current until the maximum preset current is reached; for each measurement, the core temperature is checked and eventually corrected by running or stopping the converter.…”

Section: The Virtual Instrumentmentioning

confidence: 99%

“…In general, the rise of the temperature influences the inductance, lowering its value. It can bring to a runaway situation requiring a more detailed thermal analysis [9]- [11].…”

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

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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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“…They cause an increase in the temperature of the components during their operation [65,66]. Thermal couplings occur not only between the components, but also inside them, e.g., in the case of power modules between semiconductor structures placed in the common case [67,68], and in the case of inductive components between the core and its windings [69,70].…”

Section: Thermal Phenomena In Power Convertersmentioning

confidence: 99%

Methods of Fast Analysis of DC–DC Converters—A Review

Górecki

2021

Electronics

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The paper discusses the methods of fast analysis of DC–DC converters dedicated to computer programmes. Literature methods of such an analysis are presented, which enable determination of the characteristics of the considered converters in the steady state and in the transient states. The simplifications adopted at the stage of developing these methods are discussed, and their influence on the accuracy of computations is indicated. Particular attention is paid to the methods of fast analysis of DC–DC converters, taking into account thermal phenomena in semiconductor devices. The sample results of computations of the DC–DC boost type converter obtained with the use of the selected methods are presented. The scope of application of particular computation methods and their duration times are discussed. Computations were performed with the use of SPICE and PLECS.

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

Cited by 27 publications

References 29 publications

Nonlinear models of power inductors: A survey

Nonlinear models of power inductors: A survey

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

Methods of Fast Analysis of DC–DC Converters—A Review

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