EPE Association: EPE 2015 - DS3a: Passive Components

EPE 2015 - DS3a: Passive Components
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2015 ECCE Europe - Conference > EPE 2015 - Topic 01: Devices, Packaging and System Integration > EPE 2015 - DS3a: Passive Components

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   A Fast Method for the Calculation of Foil Winding Losses
By Andreas MUESING [View]
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Abstract: This paper introduces a new two-dimensional (2D) modeling approach for the fast calculation of inductorand transformer foil winding losses. The proposed modeling procedure is derived from the Partial Ele-ment Equivalent Circuit (PEEC) method, which is originally a full three-dimensional (3D) electromag-netic solution technique. With the presented modifications, the PEEC method can take into account theinfluence of an air gap fringing field and core material boundaries as well as skin- and proximity effect.A comparison to 2D Finite Element Method (FEM) simulations shows that the developed PEEC-basedapproach exhibits similar accuracy but shorter calculation times than the classical FEM modeling tech-niques typically employed for the calculation of non-uniform current distribution within foil windings.The new modeling approach is experimentally verified by calorimetric loss measurements of a gappedfoil winding E-core inductor. Due to the fast calculation speed of the new approach, optimizations ofinductive components with foil windings over a wide design space are finally possible.

   Accurate and Computationally Efficient Modeling of Flyback Transformer Parasitics and their Influence on Converter Losses
By David LEUENBERGER [View]
[Download]

Abstract: Emerging renewable energy applications, such as PV micro inverters, demand for high step-up isolated DC-DC converters with high reliability and low cost, at high efficiency. Thanks to its low part-count the flyback converter is an optimal candidate for such applications. To achieve high efficiency over a wide load range, a decent transformer design must be performed, considering also the effects of the transformer parasitics. Therefore this work analyzes the influence of the transformer parasitic capacitances and leakage inductance in such a way, that it presents a complete tool to consider the transformer parasitics in the flyback-converter design process. A loss-analysis is performed for all three operation modes of the flyback-converter and methods for modeling the parasitic elements are discussed. To model the frequency dependence of the leakage inductance a new method is proposed. The applied models are explained in-depth and verified with measurements on prototype transformers.

   HIGH FREQUENCY MODEL OF FERRITE AND NANOCRYSTALLINE RING CORE INDUCTORS
By Carlos CUELLAR [View]
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Abstract: Ring core inductors are widely used as filter components for electromagnetic interferences mitigation. In order to design these filters with accuracy, a behavioral model of the inductors, based on an equivalent electrical circuit, is proposed in this paper. This model takes into account the frequency-dependent impedance of ferrite and nanocrystalline ring core inductors. The main contribution of this model is the inclusion of the capacitive effects (dielectric behavior) of the ferrite material, the skin effect in the nanocrystalline material and the parameterization of the electrical equivalent model as a function of number of winding turns. The proposed Behavioral Ring Core Inductor (BRCI) model is used in the simulations and the obtained results are validated by the measurements.

   High-Frequency Effects and Minimum Size Design Methodology for SMPS Transformers with Solid Round Conductors
By Ernesto L. BARRIOS [View]
[Download]

Abstract: In terms of volume, transformers are the most important components of switch mode power supplies (SMPS). When moving towards higher frequencies in order to reduce the converter volume, the impact of high-frequency (HF) effects in the windings increases. This paper proposes a transformer design methodology that takes into account these HF effects in solid round windings and allows maximizing the transformer's power density. The methodology is developed considering a forward converter case study.

   Integrated Inductor for Interleaved Operation of Two Parallel Three-phase Voltage Source Converters
By GHANSHYAMSINH GOHIL [View]
[Download]

Abstract: This paper presents an integrated inductor for two parallel interleaved Voltage Source Converters (VSCs). Interleaving of the carrier signals leads to improvement in the harmonic quality of the resultant output voltage and the line current filtering requirements can then be reduced. However, the instantaneous potential difference, caused by the interleaved carriers, may drive large circulating current between the parallel VSCs and an additional inductor is often placed in the circulating current path to suppress the current to an acceptable limit. Integration of both line filter inductor and circulating current filter inductor is proposed. The flux in the magnetic structure is analyzed and the values of the line filter inductance and circulating current filter inductance are derived. Steady-state and the transient performance of the system has been verified by means of simulation and experimental results.

EPE 2015 - DS3a: Passive Components
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2015 ECCE Europe - Conference > EPE 2015 - Topic 01: Devices, Packaging and System Integration > EPE 2015 - DS3a: Passive Components
	[return to parent folder]

	A Fast Method for the Calculation of Foil Winding Losses By Andreas MUESING	[View] [Download]
Abstract: This paper introduces a new two-dimensional (2D) modeling approach for the fast calculation of inductorand transformer foil winding losses. The proposed modeling procedure is derived from the Partial Ele-ment Equivalent Circuit (PEEC) method, which is originally a full three-dimensional (3D) electromag-netic solution technique. With the presented modifications, the PEEC method can take into account theinfluence of an air gap fringing field and core material boundaries as well as skin- and proximity effect.A comparison to 2D Finite Element Method (FEM) simulations shows that the developed PEEC-basedapproach exhibits similar accuracy but shorter calculation times than the classical FEM modeling tech-niques typically employed for the calculation of non-uniform current distribution within foil windings.The new modeling approach is experimentally verified by calorimetric loss measurements of a gappedfoil winding E-core inductor. Due to the fast calculation speed of the new approach, optimizations ofinductive components with foil windings over a wide design space are finally possible.

	Accurate and Computationally Efficient Modeling of Flyback Transformer Parasitics and their Influence on Converter Losses By David LEUENBERGER	[View] [Download]
Abstract: Emerging renewable energy applications, such as PV micro inverters, demand for high step-up isolated DC-DC converters with high reliability and low cost, at high efficiency. Thanks to its low part-count the flyback converter is an optimal candidate for such applications. To achieve high efficiency over a wide load range, a decent transformer design must be performed, considering also the effects of the transformer parasitics. Therefore this work analyzes the influence of the transformer parasitic capacitances and leakage inductance in such a way, that it presents a complete tool to consider the transformer parasitics in the flyback-converter design process. A loss-analysis is performed for all three operation modes of the flyback-converter and methods for modeling the parasitic elements are discussed. To model the frequency dependence of the leakage inductance a new method is proposed. The applied models are explained in-depth and verified with measurements on prototype transformers.

	HIGH FREQUENCY MODEL OF FERRITE AND NANOCRYSTALLINE RING CORE INDUCTORS By Carlos CUELLAR	[View] [Download]
Abstract: Ring core inductors are widely used as filter components for electromagnetic interferences mitigation. In order to design these filters with accuracy, a behavioral model of the inductors, based on an equivalent electrical circuit, is proposed in this paper. This model takes into account the frequency-dependent impedance of ferrite and nanocrystalline ring core inductors. The main contribution of this model is the inclusion of the capacitive effects (dielectric behavior) of the ferrite material, the skin effect in the nanocrystalline material and the parameterization of the electrical equivalent model as a function of number of winding turns. The proposed Behavioral Ring Core Inductor (BRCI) model is used in the simulations and the obtained results are validated by the measurements.

	High-Frequency Effects and Minimum Size Design Methodology for SMPS Transformers with Solid Round Conductors By Ernesto L. BARRIOS	[View] [Download]
Abstract: In terms of volume, transformers are the most important components of switch mode power supplies (SMPS). When moving towards higher frequencies in order to reduce the converter volume, the impact of high-frequency (HF) effects in the windings increases. This paper proposes a transformer design methodology that takes into account these HF effects in solid round windings and allows maximizing the transformer's power density. The methodology is developed considering a forward converter case study.

	Integrated Inductor for Interleaved Operation of Two Parallel Three-phase Voltage Source Converters By GHANSHYAMSINH GOHIL	[View] [Download]
Abstract: This paper presents an integrated inductor for two parallel interleaved Voltage Source Converters (VSCs). Interleaving of the carrier signals leads to improvement in the harmonic quality of the resultant output voltage and the line current filtering requirements can then be reduced. However, the instantaneous potential difference, caused by the interleaved carriers, may drive large circulating current between the parallel VSCs and an additional inductor is often placed in the circulating current path to suppress the current to an acceptable limit. Integration of both line filter inductor and circulating current filter inductor is proposed. The flux in the magnetic structure is analyzed and the values of the line filter inductance and circulating current filter inductance are derived. Steady-state and the transient performance of the system has been verified by means of simulation and experimental results.