3-phase medium frequency transformer for a 100kW 1.2kV 20kHz Dual Active Bridge converter

Dworakowski, Piotr; Wilk, Andrzej; Michna, Michał; Lefebvre, Bruno; Lagier, Thomas

doi:10.1109/iecon.2019.8926695

Cited by 13 publications

(12 citation statements)

References 27 publications

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“…The MFT prototype presented in Fig. 2 and detailed in [52] was used for the measurement and parameters estimation. Ferrite I-cores are used for the MFT magnetic core as shown in Fig.…”

Section: Equivalent B(h) Measurementmentioning

confidence: 99%

Modified Preisach Model of Hysteresis in Multi Air Gap Ferrite Core Medium Frequency Transformer

Michna

Dworakowski²,

Wilk

et al. 2022

IEEE Trans. Power Delivery

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This article presents the modified Preisach model of hysteresis for a 3-phase medium frequency transformer in a 100 kW dual active bridge converter. The transformer magnetic core is assembled out of ferrite I-cores, which results in multiple parasitic air gaps. For this transformer, the hysteresis loops were measured and the parameters of the Preisach model were determined. The Preisach distribution function is approximated with a two-dimensional Gauss function series and the feedback function is a 3rd-degree polynomial. The optimized identification of Preisach distribution function parameters was prepared. Two sets of parameters were determined based on the analysis of major and minor hysteresis loop. The developed model is used to analyze the transformer core power loss. A new set of Steinmetz equation parameters for the multi air gap ferrite core MFT is proposed.

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“…The MFT prototype presented in Fig. 2 and detailed in [52] was used for the measurement and parameters estimation. Ferrite I-cores are used for the MFT magnetic core as shown in Fig.…”

Section: Equivalent B(h) Measurementmentioning

confidence: 99%

Modified Preisach Model of Hysteresis in Multi Air Gap Ferrite Core Medium Frequency Transformer

Michna

Dworakowski²,

Wilk

et al. 2022

IEEE Trans. Power Delivery

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“…The winding of both transformers is made of the same litz wire composed of 3870 strands of 0.1 mm diameter. The MFT T2 is presented in Figure 2 and its design is detailed in [55]. In particular, a significant difference between the calculated and measured magnetizing inductance is highlighted.…”

Section: Mft Prototypesmentioning

confidence: 99%

Effective Permeability of Multi Air Gap Ferrite Core 3-Phase Medium Frequency Transformer in Isolated DC-DC Converters

et al. 2020

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The magnetizing inductance of the medium frequency transformer (MFT) impacts the performance of the isolated dc-dc power converters. The ferrite material is considered for high power transformers but it requires an assembly of type “I” cores resulting in a multi air gap structure of the magnetic core. The authors claim that the multiple air gaps are randomly distributed and that the average air gap length is unpredictable at the industrial design stage. As a consequence, the required effective magnetic permeability and the magnetizing inductance are difficult to achieve within reasonable error margins. This article presents the measurements of the equivalent B(H) and the equivalent magnetic permeability of two three-phase MFT prototypes. The measured equivalent B(H) is used in an FEM simulation and compared against a no load test of a 100 kW isolated dc-dc converter showing a good fit within a 10% error. Further analysis leads to the demonstration that the equivalent magnetic permeability and the average air gap length are nonlinear functions of the number of air gaps. The proposed exponential scaling function enables rapid estimation of the magnetizing inductance based on the ferrite material datasheet only.

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“…Both transformer prototypes were built using MnZn ferrite 3C90 and Litz wire. The design details are presented in [7], [8]. The main transformer specifications for k = 1 are presented in Table 1.…”

Section: Experimental Validationmentioning

confidence: 99%

Experimental validation and comparison of a SiC MOSFET based 100 kW 1.2 kV 20 kHz three-phase dual active bridge converter using two vector groups

Lagier

Dworakowski

Buttay

et al. 2020

2020 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe)

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The Dual Active Bridge appears as a promising DC-DC converter topology when galvanic isolation and bidirectional power flow are required. Among its advantages, Zero Voltage Switching allows the switching losses to be significantly reduced. For high power applications, the three-phase topology variant may be interesting in order to reach a higher power density, especially when a three-phase transformer is implemented instead of three single-phase transformers. Moreover, the transformer vector group offers a new degree of freedom for the designers. In this paper, the authors present the experimental validation of a 1.2 kV-100 kW-20 kHz three-phase Dual Active Bridge converter using two medium frequency transformers and different vector groups.

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3-phase medium frequency transformer for a 100kW 1.2kV 20kHz Dual Active Bridge converter

Cited by 13 publications

References 27 publications

Modified Preisach Model of Hysteresis in Multi Air Gap Ferrite Core Medium Frequency Transformer

Modified Preisach Model of Hysteresis in Multi Air Gap Ferrite Core Medium Frequency Transformer

Effective Permeability of Multi Air Gap Ferrite Core 3-Phase Medium Frequency Transformer in Isolated DC-DC Converters

Experimental validation and comparison of a SiC MOSFET based 100 kW 1.2 kV 20 kHz three-phase dual active bridge converter using two vector groups

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