EPE Association: EPE 2020 - DS1a-1: Passive Components-1

EPE 2020 - DS1a-1: Passive Components-1
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2020 ECCE Europe - Conference > EPE 2020 - Topic 01: Devices, Packaging and System Integration > EPE 2020 - DS1a-1: Passive Components-1

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   Estimation of the winding losses of Medium Frequency Transformers with litz wires using an equivalent permeability and conductivity method
By Mohammad KHAREZY [View]
[Download]

Abstract: To achieve the highest efficiency of a Dual Active Bridge converter, it is crucial to accurately calculate the winding losses of the Medium Frequency Transformer (MFT) situated inside it. In this article, an effective numerical method for calculation of the copper losses in MFTs with rectangular-shaped windings made up of Litz wire, is utilized and practically verified.

   Impact of implementation of auxiliary bias-windings on controllable inductors for power electronic converters
By Jonas PFEIFFER [View]
[Download]

Abstract: Magnetic devices are an important part of electronic converters. They can be used to control some properties of the converters. There are three different control methods using an auxiliary bias-winding.In the presented paper, the impact of the implementation of the auxiliary bias-winding was studied for mixed biasing. Three different designs were investigated in 3D-FEM-simulations and small signal measurements. Regarding the standard crosswise current arrangement all designs show the same results. Therefore, further investigations with an adapted auxiliary current arrangement were made. The results show differences for a vertical arrangement, which should be further investigated.

   Optimization of High Frequency Magnetic Devices with Consideration of the Effects of the Magnetic Material, the Core Geometry and the Switching Frequency
By Sobhi BARG [View]
[Download]

Abstract: This paper presents an optimization approach of high frequency transformers based on the calculation of the optimum number of turns. The relationship between the volume, the power and the frequency is also investigated. The design approach considers the skin and proximity effects, the core geometry and the magnetic material.

   Separation of Magnetic Flux Density Trajectories into Subloops for the Prediction of Hysteresis Loss
By Erika STENGLEIN [View]
[Download]

Abstract: Splitting the magnetic flux density trajectory into subloops has been proposed in literature to extend core loss prediction to arbitrary waveforms. This paper evaluates the approach and demonstrates that the accommodation phenomenon as well as magnetic history hamper the estimation of hysteresis loss in the presence of minor loops.

   Survey and Comparison of 1D/2D analytical Models of HF Losses in Litz Wire
By Qingchao MENG [View]
[Download]

Abstract: Litz wire (LW) is essential for reducing HF winding losses in medium frequency transformers and inductors. In order to predict the losses and optimise the parameters of LW, several analytical loss models have been presented. However, a detailed comparison of the models and the accuracy is missing. Therefore, this paper presents a comprehensive comparison of four loss models with respect to general mathematical approach, computational effort, as well as the impact of different parameters on the accuracy of the different models. Guidelines and insights for choosing the most suitable model are also provided.

EPE 2020 - DS1a-1: Passive Components-1
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2020 ECCE Europe - Conference > EPE 2020 - Topic 01: Devices, Packaging and System Integration > EPE 2020 - DS1a-1: Passive Components-1
	[return to parent folder]

	Estimation of the winding losses of Medium Frequency Transformers with litz wires using an equivalent permeability and conductivity method By Mohammad KHAREZY	[View] [Download]
Abstract: To achieve the highest efficiency of a Dual Active Bridge converter, it is crucial to accurately calculate the winding losses of the Medium Frequency Transformer (MFT) situated inside it. In this article, an effective numerical method for calculation of the copper losses in MFTs with rectangular-shaped windings made up of Litz wire, is utilized and practically verified.

	Impact of implementation of auxiliary bias-windings on controllable inductors for power electronic converters By Jonas PFEIFFER	[View] [Download]
Abstract: Magnetic devices are an important part of electronic converters. They can be used to control some properties of the converters. There are three different control methods using an auxiliary bias-winding.In the presented paper, the impact of the implementation of the auxiliary bias-winding was studied for mixed biasing. Three different designs were investigated in 3D-FEM-simulations and small signal measurements. Regarding the standard crosswise current arrangement all designs show the same results. Therefore, further investigations with an adapted auxiliary current arrangement were made. The results show differences for a vertical arrangement, which should be further investigated.

	Optimization of High Frequency Magnetic Devices with Consideration of the Effects of the Magnetic Material, the Core Geometry and the Switching Frequency By Sobhi BARG	[View] [Download]
Abstract: This paper presents an optimization approach of high frequency transformers based on the calculation of the optimum number of turns. The relationship between the volume, the power and the frequency is also investigated. The design approach considers the skin and proximity effects, the core geometry and the magnetic material.

	Separation of Magnetic Flux Density Trajectories into Subloops for the Prediction of Hysteresis Loss By Erika STENGLEIN	[View] [Download]
Abstract: Splitting the magnetic flux density trajectory into subloops has been proposed in literature to extend core loss prediction to arbitrary waveforms. This paper evaluates the approach and demonstrates that the accommodation phenomenon as well as magnetic history hamper the estimation of hysteresis loss in the presence of minor loops.

	Survey and Comparison of 1D/2D analytical Models of HF Losses in Litz Wire By Qingchao MENG	[View] [Download]
Abstract: Litz wire (LW) is essential for reducing HF winding losses in medium frequency transformers and inductors. In order to predict the losses and optimise the parameters of LW, several analytical loss models have been presented. However, a detailed comparison of the models and the accuracy is missing. Therefore, this paper presents a comprehensive comparison of four loss models with respect to general mathematical approach, computational effort, as well as the impact of different parameters on the accuracy of the different models. Guidelines and insights for choosing the most suitable model are also provided.