EPE Association: EPE 1997 – 25: Dialogue Session DS1a: PASSIVE COMPONENTS

EPE 1997 – 25: Dialogue Session DS1a: PASSIVE COMPONENTS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 – 25: Dialogue Session DS1a: PASSIVE COMPONENTS

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   THE WINDING CAPACITANCE OF SOLID AND LITZ WIRES
By M. Albach; J. Lauter [View]
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Abstract: In this paper the interwinding capacitance of multiple layer windings with solid wires is analytically calculated as a function of the various parameters involved. Based on a few simplifying assumptions the different Litz wire types can be replaced by equivalent solid wire types and the capacitance can thus also be calculated. The results are verified by extensive measurements with different Litz wires.

   AN ANALYTICAL METHOD FOR CHARACTERISTICS OF ORTHOGONAL-CORE UNDER CONSIDERATION OF MAGNETIC SATURATION AND HYSTERESIS
By K. Tajima; Y. Anazawa; T. Komukai; 0. Ichinokura [View]
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Abstract: T11is paper deals with an analytical method for characteristics of an Olihogonalcore. We calculate the flux-MMF relationship and iron loss of an orthogonal-corc based on a 3D nonlincar reluctance network model of the orthogonal-core under consideration of magnetic saturation and hysteresis. The analytical result agrees well with that measured. T11is method presented here is useful for the optimum design of application apparatuses of the orthogonal-core.

   CHARACTERISTICS OF MAGNETIZING CURRENT AND CORE LOSSES OF TRANSFORMER UNDER DISTORTED SUPPLY VOLTAGE GENERATING FROM ELECTRONIC CONVERTERS
By L. Pierrat; T. Tran-Quoc; M. Marchesoni [View]
[Download]

Abstract: This paper presents a model that permits to modelize the dynamic hysteresis loops of nonlinear transformer. The model has a combination of simplicity and accuracy. The model is used to study the influence of harmonics generating from electronic converters on magnetizing current and core losses of transformers.

   INVESTIGATION ON THE IGBT CASE EXPLOSION IN SHORT CIRCUIT OPERATION
By S. DUONG; C. SCHAEFFER; F. SARRUS; C. MULERTT [View]
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Abstract: The emergence of high power IGBT modules leads to high power switched. In this condition, designer must find means of protecting these devices against explosion of the case when a fault occurs such as a short circuit. A fuse in series with the component can prevent such an explosion. This paper will discuss on the mechanism of the explosion of an IGBT under short circuit condition. This explosion can be attributed to two phenomena : electromagnetic forces due to high current inside the device and local overpressure due to the high energy developed. Experimentation have been performed to test the influence of those phenomena and their contribution in the explosion of the case. With this study, the ideal fuse's rating can be selected in order to protect the IGBT case.

   A FUZZY DECISION SUPPORT SYSTEM FOR DESIGNING MAGNETIC COMPONENTS
By D. Holt; U. Kaymak; J.B. Klaassens; H.R. van Nauta Lemke [View]
[Download]

Abstract: Magnetic components consist only of a core of magnetic material and turns of copper wire. However, designing magnetic components is complicated, because of the large number of available core and wire types and the flexibility of the design constraints. To assist the designer, a Decision Support System (DSS) is developed that selects suitable combinations of core and wire, and ranks these complying with the degree of satisfaction of the design constraints and goals. The DSS is based on multiple attribute decision making with the use of fuzzy sets.

   CALCULATION OF THE REVERSIBLE PERMEABILITY OF FERRITE CORES WITH UNIFORM AND NON UNIFORM CROSS SECTIONS
By D. Lange; T. Wemer [View]
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Abstract: Designing ferrimagnetic components for applications like flyback converters or filters for modem telecommunication systems requires knowledge of the ferrite inductance under DC current conditions. Measurements of the inductance on E-cores in several power materials are in good agreement with the computed results using the equations suggested by R. Gans [1]. For ferrite cores with non uniform cross sections along the magnetic path like EP- or RM-cores a calculation scheme for the inductance will be presented.

   A SURVEY OF NANOCRYSTALLINE APPLICATIONS IN POWER ELECTRONICS
By F. Mazaleyrat; F. Costa [View]
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Abstract: In the aim to optimize power/weight ratio of power electronic devices, it is proposed to discuss solutions by looking forward new materials and particularly FINEMET type nanocrystalline alloys. In a first step, their properties are looked-up. In a second step, experimental results concerning the improvements in performances-- which are obtained by using nanocrystalline materials in some power electronics applications - are presented.

   Influence of the winding strategy on the parasitics of magnetic components
By R. Prieto; J.A. Cobos; O. Garcfa; J. Uceda [View]
[Download]

Abstract: The application of interleaving techniques is a very common practice in the construction of transformers for electronic circuits, in order to reduce of the AC resistance and leakage inductance. However, the effects of the interleaving techniques in the capacitive effects is not so well known. This work presents a study of the quantification of the benefits that can be achieved applying interleaving techniques between different layers (interlayer effect) and in the same layer (intralayer effect). The sensitivity of the leakage inductance, AC resistance and capacitive effects is studied in this work. Some design guidelines are extracted in order to select the best winding strategy for each transformer. The analysis has been carried out by means of Finite Element Analysis (FEA) techniques in order to take into account all the frequency and geometry effects.

EPE 1997 – 25: Dialogue Session DS1a: PASSIVE COMPONENTS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 – 25: Dialogue Session DS1a: PASSIVE COMPONENTS
	[return to parent folder]

	THE WINDING CAPACITANCE OF SOLID AND LITZ WIRES By M. Albach; J. Lauter	[View] [Download]
Abstract: In this paper the interwinding capacitance of multiple layer windings with solid wires is analytically calculated as a function of the various parameters involved. Based on a few simplifying assumptions the different Litz wire types can be replaced by equivalent solid wire types and the capacitance can thus also be calculated. The results are verified by extensive measurements with different Litz wires.

	AN ANALYTICAL METHOD FOR CHARACTERISTICS OF ORTHOGONAL-CORE UNDER CONSIDERATION OF MAGNETIC SATURATION AND HYSTERESIS By K. Tajima; Y. Anazawa; T. Komukai; 0. Ichinokura	[View] [Download]
Abstract: T11is paper deals with an analytical method for characteristics of an Olihogonalcore. We calculate the flux-MMF relationship and iron loss of an orthogonal-corc based on a 3D nonlincar reluctance network model of the orthogonal-core under consideration of magnetic saturation and hysteresis. The analytical result agrees well with that measured. T11is method presented here is useful for the optimum design of application apparatuses of the orthogonal-core.

	CHARACTERISTICS OF MAGNETIZING CURRENT AND CORE LOSSES OF TRANSFORMER UNDER DISTORTED SUPPLY VOLTAGE GENERATING FROM ELECTRONIC CONVERTERS By L. Pierrat; T. Tran-Quoc; M. Marchesoni	[View] [Download]
Abstract: This paper presents a model that permits to modelize the dynamic hysteresis loops of nonlinear transformer. The model has a combination of simplicity and accuracy. The model is used to study the influence of harmonics generating from electronic converters on magnetizing current and core losses of transformers.

	INVESTIGATION ON THE IGBT CASE EXPLOSION IN SHORT CIRCUIT OPERATION By S. DUONG; C. SCHAEFFER; F. SARRUS; C. MULERTT	[View] [Download]
Abstract: The emergence of high power IGBT modules leads to high power switched. In this condition, designer must find means of protecting these devices against explosion of the case when a fault occurs such as a short circuit. A fuse in series with the component can prevent such an explosion. This paper will discuss on the mechanism of the explosion of an IGBT under short circuit condition. This explosion can be attributed to two phenomena : electromagnetic forces due to high current inside the device and local overpressure due to the high energy developed. Experimentation have been performed to test the influence of those phenomena and their contribution in the explosion of the case. With this study, the ideal fuse's rating can be selected in order to protect the IGBT case.

	A FUZZY DECISION SUPPORT SYSTEM FOR DESIGNING MAGNETIC COMPONENTS By D. Holt; U. Kaymak; J.B. Klaassens; H.R. van Nauta Lemke	[View] [Download]
Abstract: Magnetic components consist only of a core of magnetic material and turns of copper wire. However, designing magnetic components is complicated, because of the large number of available core and wire types and the flexibility of the design constraints. To assist the designer, a Decision Support System (DSS) is developed that selects suitable combinations of core and wire, and ranks these complying with the degree of satisfaction of the design constraints and goals. The DSS is based on multiple attribute decision making with the use of fuzzy sets.

	CALCULATION OF THE REVERSIBLE PERMEABILITY OF FERRITE CORES WITH UNIFORM AND NON UNIFORM CROSS SECTIONS By D. Lange; T. Wemer	[View] [Download]
Abstract: Designing ferrimagnetic components for applications like flyback converters or filters for modem telecommunication systems requires knowledge of the ferrite inductance under DC current conditions. Measurements of the inductance on E-cores in several power materials are in good agreement with the computed results using the equations suggested by R. Gans [1]. For ferrite cores with non uniform cross sections along the magnetic path like EP- or RM-cores a calculation scheme for the inductance will be presented.

	A SURVEY OF NANOCRYSTALLINE APPLICATIONS IN POWER ELECTRONICS By F. Mazaleyrat; F. Costa	[View] [Download]
Abstract: In the aim to optimize power/weight ratio of power electronic devices, it is proposed to discuss solutions by looking forward new materials and particularly FINEMET type nanocrystalline alloys. In a first step, their properties are looked-up. In a second step, experimental results concerning the improvements in performances-- which are obtained by using nanocrystalline materials in some power electronics applications - are presented.

	Influence of the winding strategy on the parasitics of magnetic components By R. Prieto; J.A. Cobos; O. Garcfa; J. Uceda	[View] [Download]
Abstract: The application of interleaving techniques is a very common practice in the construction of transformers for electronic circuits, in order to reduce of the AC resistance and leakage inductance. However, the effects of the interleaving techniques in the capacitive effects is not so well known. This work presents a study of the quantification of the benefits that can be achieved applying interleaving techniques between different layers (interlayer effect) and in the same layer (intralayer effect). The sensitivity of the leakage inductance, AC resistance and capacitive effects is studied in this work. Some design guidelines are extracted in order to select the best winding strategy for each transformer. The analysis has been carried out by means of Finite Element Analysis (FEA) techniques in order to take into account all the frequency and geometry effects.