An automated measurement system for core loss characterization

Batista, A.J.; Fagundes, J.C.S.; Viarouge, P.

doi:10.1109/19.769682

Cited by 28 publications

(7 citation statements)

References 4 publications

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“…A measurement system addressing real operating conditions has recently been proposed in [21], where a large signal characterization is performed by using two suitable AC and DC generators to supply the inductor. 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.…”

Section: Introductionmentioning

confidence: 99%

“…As an example of application, two commercial inductors have been characterized, including them inside the SMPS circuit, retrieving the inductance vs. current curves at different temperatures. 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].…”

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

“…A measurement system addressing real operating conditions has recently been proposed in [21], where a large signal characterization is performed by using two suitable AC and DC generators to supply the inductor. An automated measurement system for core loss characterization was proposed in [22], where the attention is focused on transformers and inductors for SMPS. The heat generation and thermal model issues were discussed in [23] and [24], considering the inductor operated in the linear zone.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

View full text Add to dashboard Cite

The exploitation of power inductors outside their linear region in switching converters can be achieved by raising the current until a decrease in the inductance can be noticed. This 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 was 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 temperatures up to 105 °C. The magnetic core was then characterized by the saturation current vs. inductance, obtaining an expression for the whole family of inductors sharing the same core. Finally, we experimentally analyzed the thermal transient of the inductors in operating conditions, confirming the fundamental role of the temperature in changing the current profiles and the core saturation condition.

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“…Furthermore, the impact of the DC bias of the flux density is studied using this approach [7]. As the core losses are temperature dependent, [10] introduces a test setup using the AC metering approach capable of using a specific core temperature. However, this approach requires an amplifier capable of high frequency and power rating as well as many other expensive equipment.…”

Section: Introductionmentioning

confidence: 99%

Test setup using DC metering approach for loss measurements of inductive components – principle, characterization, validation and application

Kohlhepp

Kuebrich

Peller

et al. 2021

IET Power Electronics

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Accurate loss estimation of magnetic components is crucial for power electronics engineers. Unfortunately, loss predictions remain a quite challenging task, as these depend on many parameters and manufacturers typically do not deliver a sufficient database for precise loss estimations. Therefore, this paper revisits an approach allowing loss measurements. In contrast to the most common used approach using alternating current (AC) waveforms to gain information about the losses, this approach relies on measuring direct current (DC) voltage and current. After characterizing the experimental setup, air inductors serve as references to validate the approach. In a first step, the test setup is used to extract core losses with and without DC bias by designing a special device under test (DUT) featuring low winding loss. Furthermore, this paper demonstrates that the test setup is also able to gain the overall losses of complete magnetic components by using the DC metering approach.

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An automated measurement system for core loss characterization

Cited by 28 publications

References 4 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

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

Test setup using DC metering approach for loss measurements of inductive components – principle, characterization, validation and application

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