Ascertainment of fringing-effect losses in ferrite inductors with an air gap by thermal compact modelling and thermographic measurements

Kasikowski, R.; Więcek, B.

doi:10.1016/j.applthermaleng.2017.04.166

Cited by 10 publications

(5 citation statements)

References 10 publications

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“…Though eddy-current losses of SCASA core due to fringing flux were not evaluated in this research, Figs. 6(b) and 7(c) found in [19] demonstrate how significant the corresponding heat dissipation can be for gapped core transformers. Following calculation approximates the energy loss due to fringing effect of EER gapped core:…”

Section: B Fringing Fluxmentioning

confidence: 80%

“…6. Leakage and fringing flux associated with an air-gapped toroid: (a) flux lines distribution; (b) thermal image of a toroidal inductor[19]…”

mentioning

confidence: 99%

“…7. Fringing flux associated with an air-gapped E-shaped ferrite: (a) excessive eddy current formation [13]; (b) fringing effect of EER gapped core (R43521A125); (c) thermal image of centre gapped ferrite[19]…”

mentioning

confidence: 99%

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Importance of Leakage Magnetic Field and Fringing Flux in Surge Protector Design

Thotabaddadurage

Kularatna

Steyn-Ross

2023

IEEE Trans. on Ind. Applicat.

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Transient surge absorption capability of supercapacitors is practically implemented in a commercial surge protector known as supercapacitor assisted surge absorber (SCASA). It is a low component count high performance circuit design which utilizes a coupled inductor topology wound to a powdered-iron magnetic core. This paper investigates non-ideal characteristics of the SCASA transformer designed using various air-gapped ferrites such as manually gapped toroids and mass-produced commercially available EER cores. Emphasis is given to examine surge energy losses associated with leakage magnetic field and fringing flux of gapped transformer prototypes. In predicting effects of an air gap in ferrite materials, an analytical approach based on effective-permeance is used with validations based on SCASA inductance properties. Experimental work presented in this paper are carried out using a Noiseken lightning surge simulator adhering to IEC 60038 and IEEE C62.41 standards. In addition, SCASA prototypes were subjected to surge immunity tests specified by UL-1449 Underwriters' laboratory procedures, where a 10% reduction of load-voltage was recorded outperforming the present design.

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Section: B Fringing Fluxmentioning

confidence: 80%

“…6. Leakage and fringing flux associated with an air-gapped toroid: (a) flux lines distribution; (b) thermal image of a toroidal inductor[19]…”

mentioning

confidence: 99%

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Importance of Leakage Magnetic Field and Fringing Flux in Surge Protector Design

Thotabaddadurage

Kularatna

Steyn-Ross

2023

IEEE Trans. on Ind. Applicat.

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“…However, the porosity factor is not suggested, resulting in an inaccurate evaluation of AC resistance factor [52]. Moreover, many other analytical expressions have been presented in [57]- [60].…”

Section: B Calculation Of Transformer Lossesmentioning

confidence: 99%

FEA Based Transformer Loss Analysis for Dual Active Bridge DC–DC Converter Using Triple Phase Shift Modulation

Akbar

Hasan

Watson

et al. 2022

IEEE J. Emerg. Sel. Topics Power Electron.

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High frequency transformers are a key component of dual active bridge (DAB) dc-dc converters, providing isolation and voltage scaling. The losses in the transformer should be minimized to improve efficiency and extend lifetime. The existing research focuses on the optimization of design parameters, such as core material, cross sectional area and winding configuration to minimize losses. However, the transformer losses also depend on the harmonic content of the current as well as the design parameters and thus the efficiency can be further improved by selecting a modulation scheme which results in minimum current harmonics. This paper evaluates the effect of modulation schemes on the transformer losses of a DAB converter operating under triple phase shift (TPS) modulation by using finite element analysis. A comparison of losses under different modes of TPS modulation has been provided and it is proved that losses can be significantly reduced by selecting optimal modulation schemes. The experimental results performed on a 1kW DAB converter laboratory prototype are provided to validate the proposed work. Moreover, a generalized framework has been proposed to analyze and optimize transformer losses for isolated converters.Index Terms-Dual active bridge (DAB) dc-dc converter, finite element analysis (FEA), triple phase shift (TPS), winding loss.

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“…In dynamic thermal analysis, along with the thermal impedance, the time constant distribution and the structure functions [35] are also defined. These dynamic thermal characterisation tools have been developed to investigate thermal properties of electronic components [36][37][38][39][40] revealing latent thermal characteristics of heat transfer systems.…”

Section: Necessity Of Dynamic Thermal Analysismentioning

confidence: 99%

Dynamic thermal modelling and characterisation of power lines

Chatzipanagiotou¹,

Χατζηπαναγιώτου²

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Σκοπός της διατριβής ήταν η δυναμική θερμική μοντελοποίηση και χαρακτηρισμός γραμμών μεταφοράς ηλεκτρικής ενέργειας. Για αυτόν τον σκοπό, αναπτύχθηκε η νέα μέθοδος Εκτίμησης Συνάρτησης Μεταφοράς (Transfer Function Estimation – TFE) για δυναμική θερμική ανάλυση. Η νέα μέθοδος καθώς και η υπάρχουσα μέθοδος Αναγνώρισης Δικτύων μέσω Αποσυνέλιξης (Network Identification by Deconvolution – NID) εφαρμόστηκαν για την επεξεργασία θερμοκρασιακών βηματικών αποκρίσεων θεωρητικών και πειραματικών διατάξεων γραμμών μεταφοράς ηλεκτρικής ενέργειας. Επίσης προτάθηκε μία νέα μέθοδος για τη μοντελοποίηση μονωμένων γραμμών μεταφοράς. Προτάθηκε επιπλέον ένα βελτιωμένο θερμικό μοντέλο για γραμμές μεταφοράς σε περίπτωση φυσικής συναγωγής. Τέλος, αναπτύχθηκε μία μαθηματική συσχέτιση μεταξύ αποκρίσεων λόγω επιβολής βηματικής ισχύος και βηματικού ηλεκτρικού ρεύματος.

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Ascertainment of fringing-effect losses in ferrite inductors with an air gap by thermal compact modelling and thermographic measurements

Cited by 10 publications

References 10 publications

Importance of Leakage Magnetic Field and Fringing Flux in Surge Protector Design

Importance of Leakage Magnetic Field and Fringing Flux in Surge Protector Design

FEA Based Transformer Loss Analysis for Dual Active Bridge DC–DC Converter Using Triple Phase Shift Modulation

Dynamic thermal modelling and characterisation of power lines

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