EPE Association: EPE 2001 - Topic 01a: Passive Components

EPE 2001 - Topic 01a: Passive Components
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2001 - Conference > EPE 2001 - Topic 01: DEVICES > EPE 2001 - Topic 01a: Passive Components

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   Arrangement of Conductors to Obtain Turn-Coupling in Thick-Film Integrated Inductors for Power Converters
By M. J. Prieto; J. M. Lopera; A. M. Pernía; J. A. Martín; F. Nuño [View]
[Download]

Abstract: Even though magnetic components are still one of the key points when trying to reduce the size and weight of power converters, not many solutions have been suggested that allow obtaining them through an integration process. Thick-film technology has been presented in a recent work as an alternative to produce integrated power inductors. However, the thick-film structures do not succeed in providing coupling between turns. This paper discusses the way to distribute windings in such structures in order to obtain thick-film power inductors with turns coupled, which will further contribute to the size reduction of these components.

   Improving Metalized Polypropylene Film Capacitors Reliability Achieved
By M.H. El-Husseini; P. Venet; G. Rojat; M. Fathallah [View]
[Download]

Abstract: Aging of MPPF capacitors have been studied in this paper with the aim to improve their reliability regarding their design. The study is performed for three series of capacitors having the same capacitance but different geometry. Two types of aging were considered for the study. At the first stage, the three series of capacitors are subjected to electric stresses which consist in passing a strong sinusoidal current through the component under test. The test current is selected in such a way as not to exceed, in the worst of cases, maximum temperature supported by the element, namely around 90 °C, where the polypropylene starts to experience a shrinkage phenomenon. As a second test, the elements were overstressed by voltage and temperature. The experiments proved that long capacitor deteriorates faster than a plateshaped having the same features.

   Influence of winding position on the inductance of hf-transformers
By S. Voss; H. Roßmanith; M. Albach [View]
[Download]

Abstract: The number of turns needed for the realisation of a given inductance on a given core is normally calculated by means of the AL-value specified in data books. Unfortunately this AL-value is not a constant value, a variation of the inductance L of 70% has been measured only by changing the position of the turns inside the winding area. In this paper the influence of the gap position and especially of the position of the turns on the AL-value is demonstrated and the necessary equations for calculating this influence are presented.

   Modeling HF Resistance of Parallel Windings in Magnetic Components
By R. Prieto; J.A. Cobos; J. Uceda; M.Christini [View]
[Download]

Abstract: The use of turns connected in parallel is a very common practice when HF magnetic components are designed. The current density and the frequency usually determine the number of parallel turns needed in each design. Since the current is not equally necessarily distributed equally through each parallel strand, the modeling of this effect, accounting for the winding strategy (interleaving) and frequency effects (skin and proximity), is not an easy task. This work presents an analysis of this effect as well as possible solutions to address the modeling of these situations.

   Novel high frequency modular transformer with coaxial windings
By B. Grzesik; M. Stepien [View]
[Download]

Abstract: The paper contains proposal of novel HF modular transformer of very high efficiency (above 99.0%) and of very high power density (above the densities reached until now). The transformer has been analyzed by means of finite element method (FEM) using ANSYS software. It has windings toroidal in shape formed of coaxially arranged pipes that are placed inside of ferromagnetic core. The transformer operates at 1MHz having approximately 1.8 kW of output power.

   Passive Components Integration for Power Electronic
By S. Faucher; C. Joubert; F. Forest; F. Wilmot; E. Labouré; F. Costa [View]
[Download]

Abstract: New structures of integrated passive components, based on both planar and cylindrical subcomponents are introduced. This paper investigates the trade-offs between dimensions, thermal behavior and electromagnetic performances of the structures. The electromagnetic limits are analysed in terms of physical dimensions and thermal dissipation capabilities. An example of a Forward SMPS output filter is used to illustrate the analysis. A high frequency electrical model of the sub-components is then proposed. This model is based on the transmission line theory.

   Review of 2D eddy current losses in SMPS transformers
By F. Robert; P. Mathys; J-P. Schauwers [View]
[Download]

Abstract: This paper gives an original catalog of possible 2D effects governing eddy current losses in transformer windings regarding conductor's type and frequency. The main goal is to provide industrial designers a deeper understanding of the 2D fields in real transformers. A new aspect covered in this paper is the analysis of 2D effects on the whole frequency range, including harmonic frequencies. Experimental validation is provided by measuring AC resistance of real magnetic devices.

   Silicon Nonlinear Capacitors
By H. Hakim; J-P. Laur; J-L Sanchez; E. Scheid; P. Dubreuil [View]
[Download]

Abstract: This paper is focused on the integration of nonlinear capacitors for power electronics applications. We study more particularly a structure based on a trench topology and combining MOS and PN junction capacitance effects. Static and dynamic behaviour of the device are analyzed thanks to simulations. A specifical peripheral termination for deep trench devices is proposed. Finally we present the main process steps and the electrical characterization results of the first prototypes.

   Size advantage of coreless transformers in the MHz range
By E. Waffenschmidt; B. Ackermann [View]
[Download]

Abstract: The volume reduction of conventional transformers by increasing the switching frequency is mainly limited by increasing core losses. Coreless transformers have only winding losses and show a much more pronounced size reduction with increasing frequency. Therefore they have a size advantage in the MHz range which is corroborated by measurements.

   Sizing Method of External Capacitors for series association of Insul
By PO. Jeannin; D. Frey; JL. Schanen [View]
[Download]

Abstract: In this paper, the behavior of drain-to-source voltage evolution of insulated gate components during transients is studied. Analytical formula is obtained, which takes into account eventual external capacitors. The minimal value of the Cds external capacitance to impose the dVds/dt can be deviated from this study. As an application, a two MOSFETs series association is proposed, and validated using both simulation and measurement for using external Cds or Cgd capacitors.

   Thermal modeling and behavior of ultracapacitors for electric vehicle
By B.L. Meng; H. Gualous; D. Bouquain; A. Djerdir; A. Berthon; J.M. Kauffmann [View]
[Download]

Abstract: The aim of this paper is to define the thermal behavior of ultracapacitors using an electrical model taking into account thermal variations of the device and its environment. Ultracapacitors of 2700 F and 3700 F have been tested. An equivalent circuit is proposed to describe the electrical and the thermal behavior of the ultracapacitors. The model obtained is implemented in Saber and Spice software for simulation. The equivalent circuit response and the experimental results are compared and analyzed.

EPE 2001 - Topic 01a: Passive Components
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2001 - Conference > EPE 2001 - Topic 01: DEVICES > EPE 2001 - Topic 01a: Passive Components
	[return to parent folder]

	Arrangement of Conductors to Obtain Turn-Coupling in Thick-Film Integrated Inductors for Power Converters By M. J. Prieto; J. M. Lopera; A. M. Pernía; J. A. Martín; F. Nuño	[View] [Download]
Abstract: Even though magnetic components are still one of the key points when trying to reduce the size and weight of power converters, not many solutions have been suggested that allow obtaining them through an integration process. Thick-film technology has been presented in a recent work as an alternative to produce integrated power inductors. However, the thick-film structures do not succeed in providing coupling between turns. This paper discusses the way to distribute windings in such structures in order to obtain thick-film power inductors with turns coupled, which will further contribute to the size reduction of these components.

	Improving Metalized Polypropylene Film Capacitors Reliability Achieved By M.H. El-Husseini; P. Venet; G. Rojat; M. Fathallah	[View] [Download]
Abstract: Aging of MPPF capacitors have been studied in this paper with the aim to improve their reliability regarding their design. The study is performed for three series of capacitors having the same capacitance but different geometry. Two types of aging were considered for the study. At the first stage, the three series of capacitors are subjected to electric stresses which consist in passing a strong sinusoidal current through the component under test. The test current is selected in such a way as not to exceed, in the worst of cases, maximum temperature supported by the element, namely around 90 °C, where the polypropylene starts to experience a shrinkage phenomenon. As a second test, the elements were overstressed by voltage and temperature. The experiments proved that long capacitor deteriorates faster than a plateshaped having the same features.

	Influence of winding position on the inductance of hf-transformers By S. Voss; H. Roßmanith; M. Albach	[View] [Download]
Abstract: The number of turns needed for the realisation of a given inductance on a given core is normally calculated by means of the AL-value specified in data books. Unfortunately this AL-value is not a constant value, a variation of the inductance L of 70% has been measured only by changing the position of the turns inside the winding area. In this paper the influence of the gap position and especially of the position of the turns on the AL-value is demonstrated and the necessary equations for calculating this influence are presented.

	Modeling HF Resistance of Parallel Windings in Magnetic Components By R. Prieto; J.A. Cobos; J. Uceda; M.Christini	[View] [Download]
Abstract: The use of turns connected in parallel is a very common practice when HF magnetic components are designed. The current density and the frequency usually determine the number of parallel turns needed in each design. Since the current is not equally necessarily distributed equally through each parallel strand, the modeling of this effect, accounting for the winding strategy (interleaving) and frequency effects (skin and proximity), is not an easy task. This work presents an analysis of this effect as well as possible solutions to address the modeling of these situations.

	Novel high frequency modular transformer with coaxial windings By B. Grzesik; M. Stepien	[View] [Download]
Abstract: The paper contains proposal of novel HF modular transformer of very high efficiency (above 99.0%) and of very high power density (above the densities reached until now). The transformer has been analyzed by means of finite element method (FEM) using ANSYS software. It has windings toroidal in shape formed of coaxially arranged pipes that are placed inside of ferromagnetic core. The transformer operates at 1MHz having approximately 1.8 kW of output power.

	Passive Components Integration for Power Electronic By S. Faucher; C. Joubert; F. Forest; F. Wilmot; E. Labouré; F. Costa	[View] [Download]
Abstract: New structures of integrated passive components, based on both planar and cylindrical subcomponents are introduced. This paper investigates the trade-offs between dimensions, thermal behavior and electromagnetic performances of the structures. The electromagnetic limits are analysed in terms of physical dimensions and thermal dissipation capabilities. An example of a Forward SMPS output filter is used to illustrate the analysis. A high frequency electrical model of the sub-components is then proposed. This model is based on the transmission line theory.

	Review of 2D eddy current losses in SMPS transformers By F. Robert; P. Mathys; J-P. Schauwers	[View] [Download]
Abstract: This paper gives an original catalog of possible 2D effects governing eddy current losses in transformer windings regarding conductor's type and frequency. The main goal is to provide industrial designers a deeper understanding of the 2D fields in real transformers. A new aspect covered in this paper is the analysis of 2D effects on the whole frequency range, including harmonic frequencies. Experimental validation is provided by measuring AC resistance of real magnetic devices.

	Silicon Nonlinear Capacitors By H. Hakim; J-P. Laur; J-L Sanchez; E. Scheid; P. Dubreuil	[View] [Download]
Abstract: This paper is focused on the integration of nonlinear capacitors for power electronics applications. We study more particularly a structure based on a trench topology and combining MOS and PN junction capacitance effects. Static and dynamic behaviour of the device are analyzed thanks to simulations. A specifical peripheral termination for deep trench devices is proposed. Finally we present the main process steps and the electrical characterization results of the first prototypes.

	Size advantage of coreless transformers in the MHz range By E. Waffenschmidt; B. Ackermann	[View] [Download]
Abstract: The volume reduction of conventional transformers by increasing the switching frequency is mainly limited by increasing core losses. Coreless transformers have only winding losses and show a much more pronounced size reduction with increasing frequency. Therefore they have a size advantage in the MHz range which is corroborated by measurements.

	Sizing Method of External Capacitors for series association of Insul By PO. Jeannin; D. Frey; JL. Schanen	[View] [Download]
Abstract: In this paper, the behavior of drain-to-source voltage evolution of insulated gate components during transients is studied. Analytical formula is obtained, which takes into account eventual external capacitors. The minimal value of the Cds external capacitance to impose the dVds/dt can be deviated from this study. As an application, a two MOSFETs series association is proposed, and validated using both simulation and measurement for using external Cds or Cgd capacitors.

	Thermal modeling and behavior of ultracapacitors for electric vehicle By B.L. Meng; H. Gualous; D. Bouquain; A. Djerdir; A. Berthon; J.M. Kauffmann	[View] [Download]
Abstract: The aim of this paper is to define the thermal behavior of ultracapacitors using an electrical model taking into account thermal variations of the device and its environment. Ultracapacitors of 2700 F and 3700 F have been tested. An equivalent circuit is proposed to describe the electrical and the thermal behavior of the ultracapacitors. The model obtained is implemented in Saber and Spice software for simulation. The equivalent circuit response and the experimental results are compared and analyzed.