Induktivitäten in der Leistungselektronik

Albach, Manfred

doi:10.1007/978-3-658-15081-5

Cited by 43 publications

(19 citation statements)

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“…The equivalent conductivity and complex permeability of the homogenized litz are discussed in [56]. Alternative methods to compute the equivalent properties representing ohmic losses due to skin and proximity effect are described in the literature [55], [56], [66]- [69]. The formulation proposed in [56] is chosen for its proven accuracy.…”

Section: Rlc Parameters Of the Modelmentioning

confidence: 99%

“…At this point, the model allows predicting f s . To estimate the correct amplification of the PWM voltage harmonics in correspondence to the resonance, the resistance R of each group of turns is introduced and defined considering the frequency-dependent losses P t caused by a current I in a single turn [67], [69], [78]…”

Section: B High-frequency Model Of the Mft For Routine Designmentioning

confidence: 99%

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Voltage Distribution in the Windings of Medium-Frequency Transformers Operated With Wide Bandgap Devices

Cremasco

Rothmund

Curti

et al. 2022

IEEE J. Emerg. Sel. Topics Power Electron.

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The short rise time observed in the PWM voltages generated by ultra-fast wide bandgap devices increases the amplitude of voltage harmonics at higher frequencies. These harmonics can excite the resonances of Medium-Frequency Transformers (MFTs), resulting in overvoltages inside the windings during continuous operation. Without further measures, these overvoltages can lead to unexpectedly high electric fields in the insulation material, which can result in partial discharge, accelerated ageing and possible failure of the MFT. To avoid these effects, the mechanism causing the overvoltages has to be understood and quantified during the design process. Based on this, the MFT can be designed in a way that the overvoltages vanish or are tolerable. Therefore, the voltage distribution inside the MFT windings is analysed by a fully-coupled multi-conductor transmission line model, which includes the damping effect of electromagnetic losses in the litz wire and in the core. This method is verified by measuring the transfer functions of the voltage to ground of individual turns and their voltage waveforms during continuous operation. The waveforms indicate repeating overvoltages inside the windings. A guideline for the design verification and a simplified approach to speed-up the modelling process are presented.

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Section: Rlc Parameters Of the Modelmentioning

confidence: 99%

Section: B High-frequency Model Of the Mft For Routine Designmentioning

confidence: 99%

Voltage Distribution in the Windings of Medium-Frequency Transformers Operated With Wide Bandgap Devices

Cremasco

Rothmund

Curti

et al. 2022

IEEE J. Emerg. Sel. Topics Power Electron.

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“…In addition, the equation µJ z = −γ 2 A z must be fulfilled under the assumption that the magnetic vector potential and the scalar electric potential can be summarized [23]. Thus, the magnetic scalar potential has to satisfy the scalar diffusion equation…”

Section: Model Derivationmentioning

confidence: 99%

“…Using the equations derived in section 2 for the magnetic field and the scalar vector potential, the conduction losses of a single foil exposed to air gaps can be calculated by applying Poynting's theorem [23].…”

Section: Calculation Of the Power Loss Per Unit Lengthmentioning

confidence: 99%

Analytical eddy current loss model for foil conductors in gapped cores

Ewald¹,

Biela²

2021

2021 23rd European Conference on Power Electronics and Applications (EPE'21 ECCE Europe)

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For modelling and optimizing gapped high-frequency inductors, the calculation of eddy current losses in foil windings due to the two-dimensional fringing field caused by air gaps in the core is important. The winding loss models must offer a high accuracy when calculating the 2D field distribution and must be computationally efficient in order to enable several thousand calculations in a short time required during the optimization. This article proposes an analytical model based on the magnetic vector potential formulation that can predict the eddy current losses in foil windings due to the fringing field of an arbitrary number of air gaps. The analytical model is used to derive a closed-form loss formula, which is verified by FEA simulations.

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“…Losses in inductive components are particularly difficult to obtain, as different loss mechanisms exist: Winding and core loss. Winding losses can further be separated into RMS winding losses, skin and proximity losses [1]. The core losses resulting from the high frequency excitation of the magnetic material represents another part of the inductor losses.…”

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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Induktivitäten in der Leistungselektronik

Cited by 43 publications

References 0 publications

Voltage Distribution in the Windings of Medium-Frequency Transformers Operated With Wide Bandgap Devices

Voltage Distribution in the Windings of Medium-Frequency Transformers Operated With Wide Bandgap Devices

Analytical eddy current loss model for foil conductors in gapped cores

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

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