EPE Association: EPE 2017 - LS5d: Passives

EPE 2017 - LS5d: Passives
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2017 ECCE Europe - Conference > EPE 2017 - Topic 01: Devices, Packaging and System Integration > EPE 2017 - LS5d: Passives

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   Application of Extremum Co-Energy Principle for Homogenizing Current Distribution in Parallel-Connected Windings in Transformers: Design Optimization of Winding
By Tomohide SHIRAKAWA [View]
[Download]

Abstract: Parallel-connected windings are widely utilized for power transformers to reduce the copper loss. However, this reduction effect is often hindered by the proximity effect, which causes concentrated current distribution in parallel-connected windings. This paper addresses this issue by proposing a design optimization method of winding turn allocation among winding layers. This optimization method is based on the recently proposed insight on the proximity effect, referred to as the extremum co-energy principle. Experiment on a planar transformer with four primary winding layers was carried out to verify the proposed method. As a result, the proposed method successfully optimized the allocation of the winding turns to minimize the AC resistance.

   Development of a 100 kW, 12.5 kV, 22 kHz and 30 kV Insulated Medium Frequency Transformer for Compact and Reliable Medium Voltage Power Conversion
By Stephane ISLER [View]
[Download]

Abstract: This paper presents the critical design aspects addressed during the development of a 100 kW, 12.5 kV,22 kHz, and 30 kV insulated medium frequency transformer used in a power converter. The transformersare used in a resonant multilevel converter topology producing HV DC voltage from a three phase400 V AC industrial grid. The ±12.5 kV DC voltage is used to supply radio frequency systems in particleaccelerators. Considerations about material selection, dielectric, magnetic and thermal design arediscussed and experimental results on the full scale transformer and power converter are presented.

   Modelling Hysteresis of Soft Core Materials using Permeance-Capacitance Analogy for Transient Circuit Simulations
By Min LUO [View]
[Download]

Abstract: Magnetic components using soft core materials are widely used in power electronic converters. The hysteresis effect of the material leads to power loss and harmonic distortion. If this effect can be modeled in system-level time-domain simulation, the performance of the magnetic component in combination with power converters can be predicted more accurately during the design phase. This work proposes an approach to model the hysteresis effect of soft magnetic materials in magnetic circuits based on the permeance-capacitance analogy.

   Thermal Modeling and Experimental Verification of an Air Cooled Medium Frequency Transformer
By Marko MOGOROVIC [View]
[Download]

Abstract: This paper provides detailed analytical modeling and finite elements method (FEM) analysis of the thermal behavior of the medium frequency transformer (MFT). A comprehensive analytical model in form of a thermal network consisting of conduction, convection and radiation thermal resistances is generated based on the transformer physical structure, thus allowing for fast optimization of the MFT design in terms of hot-spot temperatures. The derived analytical models are benchmarked and verified against FEM models and measurements obtained from the developed MFT prototype.

EPE 2017 - LS5d: Passives
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2017 ECCE Europe - Conference > EPE 2017 - Topic 01: Devices, Packaging and System Integration > EPE 2017 - LS5d: Passives
	[return to parent folder]

	Application of Extremum Co-Energy Principle for Homogenizing Current Distribution in Parallel-Connected Windings in Transformers: Design Optimization of Winding By Tomohide SHIRAKAWA	[View] [Download]
Abstract: Parallel-connected windings are widely utilized for power transformers to reduce the copper loss. However, this reduction effect is often hindered by the proximity effect, which causes concentrated current distribution in parallel-connected windings. This paper addresses this issue by proposing a design optimization method of winding turn allocation among winding layers. This optimization method is based on the recently proposed insight on the proximity effect, referred to as the extremum co-energy principle. Experiment on a planar transformer with four primary winding layers was carried out to verify the proposed method. As a result, the proposed method successfully optimized the allocation of the winding turns to minimize the AC resistance.

	Development of a 100 kW, 12.5 kV, 22 kHz and 30 kV Insulated Medium Frequency Transformer for Compact and Reliable Medium Voltage Power Conversion By Stephane ISLER	[View] [Download]
Abstract: This paper presents the critical design aspects addressed during the development of a 100 kW, 12.5 kV,22 kHz, and 30 kV insulated medium frequency transformer used in a power converter. The transformersare used in a resonant multilevel converter topology producing HV DC voltage from a three phase400 V AC industrial grid. The ±12.5 kV DC voltage is used to supply radio frequency systems in particleaccelerators. Considerations about material selection, dielectric, magnetic and thermal design arediscussed and experimental results on the full scale transformer and power converter are presented.

	Modelling Hysteresis of Soft Core Materials using Permeance-Capacitance Analogy for Transient Circuit Simulations By Min LUO	[View] [Download]
Abstract: Magnetic components using soft core materials are widely used in power electronic converters. The hysteresis effect of the material leads to power loss and harmonic distortion. If this effect can be modeled in system-level time-domain simulation, the performance of the magnetic component in combination with power converters can be predicted more accurately during the design phase. This work proposes an approach to model the hysteresis effect of soft magnetic materials in magnetic circuits based on the permeance-capacitance analogy.

	Thermal Modeling and Experimental Verification of an Air Cooled Medium Frequency Transformer By Marko MOGOROVIC	[View] [Download]
Abstract: This paper provides detailed analytical modeling and finite elements method (FEM) analysis of the thermal behavior of the medium frequency transformer (MFT). A comprehensive analytical model in form of a thermal network consisting of conduction, convection and radiation thermal resistances is generated based on the transformer physical structure, thus allowing for fast optimization of the MFT design in terms of hot-spot temperatures. The derived analytical models are benchmarked and verified against FEM models and measurements obtained from the developed MFT prototype.