Enabling foil windings of medium-frequency transformers for high currents

Gradinger, Thomas B.; Drofenik, U.; Grecki, Filip

doi:10.23919/epe20ecceeurope43536.2020.9215916

Cited by 10 publications

(10 citation statements)

References 14 publications

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“…Thus, additional impedances of connected cables applied to LV1 and LV2 windings have altered the first two rows making them distinct. A similar phenomenon is mentioned in [10].…”

Section: Windingssupporting

confidence: 77%

Mitigation of Circulating Currents in Parallel Foil Windings for Medium Frequency Transformers

et al. 2022

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“…Thus, additional impedances of connected cables applied to LV1 and LV2 windings have altered the first two rows making them distinct. A similar phenomenon is mentioned in [10].…”

Section: Windingssupporting

confidence: 77%

Mitigation of Circulating Currents in Parallel Foil Windings for Medium Frequency Transformers

et al. 2022

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“…However, to achieve the most accurate benchmark values for verifying the model, the meshes are parametrised in this elevated level of detail. It is to note that foil windings were meshed with a rectangular mesh such that the angle between mesh lines and expected field gradient is minimal, which minimises interpolation errors along the direction of the field gradient as done in [37]. Mesh plots are spared at this point as the mesh is too fine to be visualised in a reasonable size.…”

Section: Verification Of It2d Modelmentioning

confidence: 99%

Improved Analytical Triple-2D Leakage Inductance Model of Cone Winding Matrix Transformers

Schlesinger¹,

Biela²

2023

IEEE Open J. Power Electron.

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The transformer leakage inductance is one of the limiting factors for pulse shape quality in high voltage pulsed power (HVPP) converters that are essential in applications such as cancer treatment, particle accelerators, and free electron lasers. Cone winding matrix (CWM) transformers are commonly used in HVPP converters as they offer low leakage inductance and high insulation distance. This paper proposes an improved Triple-2D (iT2D) leakage inductance model for CWM transformers. The iT2D model identifies three basic cross sections of CWM transformers and calculates their associated leakage inductance contributions. The paper proposes an accurate and compact analytical formula of the leakage inductance contribution resulting from the magnetic energy stored in between the magnetic cores. For cross sections with cone windings, an expression is presented that computes the leakage inductance per unit length of non-parallel windings. The iT2D model is verified with measurements and finite element simulations of three transformer prototypes. The analytical solutions used in the iT2D model ensure applicability to arbitrary geometric aspect ratios and designs. Furthermore, the iT2D model is rapidly executable enabling its time-efficient integration in converter optimisations.

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“…In foil conductors, the current rating is constrained by the maximum feasible conductor height, determined by the window height of commercially available cores and the MV insulation clearances. Foil paralleling is often required, therefore increasing the design complexity [25], [26].…”

Section: High Current Ratingmentioning

confidence: 99%

Medium-Frequency Transformers for Fast Rise Time PWM Voltages: Modelling and Design Considerations

Cremasco

Curti

Pourkeivannour

et al. 2021

2021 Sixteenth International Conference on Ecological Vehicles and Renewable Energies (EVER)

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Enabling foil windings of medium-frequency transformers for high currents

Cited by 10 publications

References 14 publications

Mitigation of Circulating Currents in Parallel Foil Windings for Medium Frequency Transformers

Mitigation of Circulating Currents in Parallel Foil Windings for Medium Frequency Transformers

Improved Analytical Triple-2D Leakage Inductance Model of Cone Winding Matrix Transformers

Medium-Frequency Transformers for Fast Rise Time PWM Voltages: Modelling and Design Considerations

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