Soft magnetic materials and their applications in transformers

Ram, B. Sai; Paul, Arun Kumar; Kulkarni, S.V.

doi:10.1016/j.jmmm.2021.168210

“…It was clear that 20 kHz PI controller was reliable but it had overshoot and undershoot. To improve the control response the value of f s is increased (9). Calculated values of different control parameters (see Table III) get better.…”

Section: Modified Control Function To Boost Efficacymentioning

confidence: 99%

“…Power converter and topologies [8] used, therein 2. Transformer for isolation and voltage translation [9] 3. Sensors and actuators [10] 4.…”

Section: Introductionmentioning

confidence: 99%

Efficacy of STC in Magnetically Coupled High Frequency Power Electronics Systems: Full-Bridge DC-DC Converter

Paul¹

2021

Preprint

0

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Due to its simple gain selection and implementation procedures high-gain sliding mode control idea was introduced. Apart from achieving robustness features, the aim was to reduce product-design cycle time. To overcome its basic chattering issues, it was replaced by complex super twisting control (STC). Subsequently, the research in this field has been extensive, intense and persistent. The idea has been validated in several applications generating great hope in minds of industry experts. Its real success, however, would depend on its adoption and diffusion into industry domain, where an analysis of validating STC based products is due. In STC, selection of gains is based on worst-case values of disturbance and/or its derivative. Can such procedure ensure controller’s reliable functioning? This article proposes that such simplistic procedure of gain selection may not work for power electronics controllers where, particularly, the actuation or controlled power transfer to load is through magnetically-coupled system. Using practical approach, this article elaborates that optimally designed transformer, driven by high-gain super twisting controller, invites problem of core saturation leading to higher switching losses, poor operating duty cycle of the system and there could be problem of reliability. It further details an alternate high-gain controller that generates superior efficacy.

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“…) 𝐿 1 and, 𝐾 I = 𝐿 1 𝜔 𝑛 2 (9) Considering equivalent arc load R L at 0.09Ω and L1 at 75 µH, the value K P is 1.2 and K I is 7500.…”

Section: A Pi Control For Constant Current Applicationsmentioning

confidence: 99%

Efficacy of STC in Magnetically Coupled High Frequency Power Electronics Systems: Full-Bridge DC-DC Converter

Paul¹

2021

Preprint

0

View full text Add to dashboard Cite

Due to its simple gain selection and implementation procedures high-gain sliding mode control idea was introduced. Apart from achieving robustness features, the aim was to reduce product-design cycle time. To overcome its basic chattering issues, it was replaced by complex super twisting control (STC). Subsequently, the research in this field has been extensive, intense and persistent. The idea has been validated in several applications generating great hope in minds of industry experts. Its real success, however, would depend on its adoption and diffusion into industry domain, where an analysis of validating STC based products is due. In STC, selection of gains is based on worst-case values of disturbance and/or its derivative. Can such procedure ensure controller’s reliable functioning? This article proposes that such simplistic procedure of gain selection may not work for power electronics controllers where, particularly, the actuation or controlled power transfer to load is through magnetically-coupled system. Using practical approach, this article elaborates that optimally designed transformer, driven by high-gain super twisting controller, invites problem of core saturation leading to higher switching losses, poor operating duty cycle of the system and there could be problem of reliability. It further details an alternate high-gain controller that generates superior efficacy.

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“…Amongst the current research lines, soft magnetic alloys have become one of the main fields of interest. The relevance in the study of these alloys is related to the wide range of applicability in: sensors, transformer cores, and magnetic actuators [1][2][3]. These applications are based on the properties of these alloys, including low coercivity and high magnetoresistance [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Characterization and Analysis of Nanocrystalline Soft Magnetic Alloys: Fe Based

Daza

¹

,

Mbarek

²

,

Escoda

³

et al. 2021

Metals

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Soft magnetic nanocrystalline alloys have been widely analysed and studied during the past years. However, optimisation of specific chemical compositions is still being developed. The applicability of these soft nanocrystalline alloys depends mainly on the presence of the desired nanocrystalline phases within the alloy. In this study, the analysed alloys are manufactured by mechanical alloying. The analyses performed on the samples include a microstructural analysis, a thermal analysis, and a complementary functional analysis in the form of the thermomagnetic response of some samples. Regarding Fe-based alloys, thermal stability for samples containing B was higher than those containing P (crystal growth peaks in the range between 895–905 K and 775–800 K respectively). The higher magnetization of saturation, Ms, was found in Fe–Mn alloys, whereas the addition of boron provoked a decrease of Ms and the nanocrystals size.

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Soft magnetic materials and their applications in transformers

Cited by 57 publications

References 61 publications

Efficacy of STC in Magnetically Coupled High Frequency Power Electronics Systems: Full-Bridge DC-DC Converter

Efficacy of STC in Magnetically Coupled High Frequency Power Electronics Systems: Full-Bridge DC-DC Converter

Efficacy of STC in Magnetically Coupled High Frequency Power Electronics Systems: Full-Bridge DC-DC Converter

Characterization and Analysis of Nanocrystalline Soft Magnetic Alloys: Fe Based

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