EPE Association: EPE 2018 - DS2a: Passive Components

EPE 2018 - DS2a: Passive Components
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2018 ECCE Europe - Conference > EPE 2018 - Topic 01: Devices, Packaging and System Integration > EPE 2018 - DS2a: Passive Components

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   A Novel Aluminum Electrolytic Capacitor Suitable for High-frequency Power Converters
By Atsushi YOSHIDA [View]
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Abstract: Aluminum electrolytic capacitors have high capacitance and high volumetric efficiency. Electrolytic capacitors with high rated voltage (> 300 V), however, show large reduction of capacitance in high frequency regions, which is attributable to the long tunnel pit structure of anode foils. To demonstrate the effect of the structure, equivalent circuit simulations focusing on voltage transient phenomena concerning the tunnel pit length were performed. In addition, effective capacitance measurements under current pulse operation were carried out with prototype capacitors with different tunnel length. The test results demonstrated the feasibility of a new concept electrolytic capacitor for high frequency applications. The new concept can provide an advantage in helping in downsizing and increment of ripple current capability at high frequency. The performance of the proposed capacitors utilizing an anode foil with appropriate structure was evaluated. As a result of the high frequency ripple current operation tests, it was found that approximately 30\% increase in ripple current capability at high frequency when the capacitor size is held constant, and approximately 25\% reduction in capacitor volume when high-frequency capacitance and ripple current capability are held constant can be achieved.

   Characterization of ferroelectric ceramic capacitors
By Sam BEN-YAAKOV [View]
[Download]

Abstract: The fundamental role of the Q=f(v) function in the characterization of ferroelectric ceramiccapacitors is delineated and analyzed. Guidelines for reconstructing the Q=f(v) data from manufacturers' data are developed and shown to yield additional information on the capacitors. The analytical derivations were backed by simulation and experimental results. Application of the voltage dependent ferroelectric capacitors as a control element for a fixed frequency series resonant converter was tested by simulation. The results suggest that this proposed approach is viable and that the expected performance is comparable to that of a variable frequency series resonant converter

   Comparison study of different choke variants for PV boost converters
By Marco JUNG [View]
[Download]

Abstract: This paper presents a comparison study of different choke variants for PV boost converters. A decreased ratio of power to weight and thereby a reduction in material was achieved by increasing the switching frequency and using a new ferrite material. All analysis and simulations were verified in a boost converter demonstrator setup.

   Design and Comparative Analysis of Litz and Copper Foil Transformers for High Frequency Applications
By Afia KHAN [View]
[Download]

Abstract: This paper presents the comparative analysis of Copper Foil and Litz wound transformers for high frequency applications. The skin and proximity effects due to eddy currents are analyzed for both windings.The design and selection of foil and Litz windings for a high frequency transformer is discussed, and thedesigned transformers are compared on the basis of their AC resistance factor and leakage inductance. Amethod to reduce the AC resistance factor and leakage inductance for the two winding techniques is alsoproposed. The preference of Foil winding design for a high frequency transformer is validated by meansof experimental results.

   Development of Bus Bar Structure with Low Imbalance in Stray Inductance for Three-phase Silicon Carbide Inverter
By Masato ANDO [View]
[Download]

Abstract: This paper presents a three-phase inverter structure for reducing imbalances in the switching loss among power modules connected parallel to one another and among the three phases. The proposed double-sided structure achieved an imbalance of less than 3\% in the experimental switching loss using all-SiC power modules.

   Hybrid magnetic 3-phase Integrated EMI filter
By Wai Keung MO [View]
[Download]

Abstract: The integrated EMI filter approach is an effective solution to miniaturize the overall EMI filter dimensions especailly in 3-phase power applications. The hybrid magnetic approach offers synergistic effects by merging benefits of different magnetic materials. This paper describes a design of a hybrid magnetic core integrated into a standard 3-phase EMI filter.

   Linearized Modeling and Controller Design of the Nonlinear Inductors in aß-frame
By Shih-Feng CHOU [View]
[Download]

Abstract: The nonlinearity of the inductor affects the stability of the system and the bandwidth of the controller. This paper proposes a linearized method for linearizing the nonlinear inductor in the aß-frame under given load condition. A current controller design method is also proposed in this paper to adapt the equivalent inductance change. The equivalent inductance of a nonlinear inductor depends on the peak current flowing through the inductor in the aß-frame but dissociates to the power factor of the output current. Simulation results and experiment results verify the theoretical derivation.

   Prototyping and testing embedded transformer for 100W 1MHz GaN converter
By Marc BOHNKE [View]
[Download]

Abstract: The miniaturization of power converters, and the enhancement of their performances are one of the major challenges in today's power electronic community. At CEA, we are working on integration of active (GaN/Si, GaN IC) and passive (planar transformers, inductors, embedded capacitor) components. Packaging architecture leading to a better integration, and enhanced topologies providing better efficiencies are in the spectra of our roadmap as well. The need for miniaturization and access to better yield are especially addressing the consumer electronic, as for example USB type C power delivery application.The first part of this document is an introduction that highlight the technical challenges and targets of our work. Then, we are focusing on development of ferrite material. Our goal is to design and build proof of concept of a planar core implemented in a printed circuit board. The prototyping of ultra-thin integrated transformer is presented as well as its implementation in a LLC type converter. In this document, we will present the results of measurements; both electrical and thermal measurements will be shown and discussed.

EPE 2018 - DS2a: Passive Components
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2018 ECCE Europe - Conference > EPE 2018 - Topic 01: Devices, Packaging and System Integration > EPE 2018 - DS2a: Passive Components
	[return to parent folder]

	A Novel Aluminum Electrolytic Capacitor Suitable for High-frequency Power Converters By Atsushi YOSHIDA	[View] [Download]
Abstract: Aluminum electrolytic capacitors have high capacitance and high volumetric efficiency. Electrolytic capacitors with high rated voltage (> 300 V), however, show large reduction of capacitance in high frequency regions, which is attributable to the long tunnel pit structure of anode foils. To demonstrate the effect of the structure, equivalent circuit simulations focusing on voltage transient phenomena concerning the tunnel pit length were performed. In addition, effective capacitance measurements under current pulse operation were carried out with prototype capacitors with different tunnel length. The test results demonstrated the feasibility of a new concept electrolytic capacitor for high frequency applications. The new concept can provide an advantage in helping in downsizing and increment of ripple current capability at high frequency. The performance of the proposed capacitors utilizing an anode foil with appropriate structure was evaluated. As a result of the high frequency ripple current operation tests, it was found that approximately 30\% increase in ripple current capability at high frequency when the capacitor size is held constant, and approximately 25\% reduction in capacitor volume when high-frequency capacitance and ripple current capability are held constant can be achieved.

	Characterization of ferroelectric ceramic capacitors By Sam BEN-YAAKOV	[View] [Download]
Abstract: The fundamental role of the Q=f(v) function in the characterization of ferroelectric ceramiccapacitors is delineated and analyzed. Guidelines for reconstructing the Q=f(v) data from manufacturers' data are developed and shown to yield additional information on the capacitors. The analytical derivations were backed by simulation and experimental results. Application of the voltage dependent ferroelectric capacitors as a control element for a fixed frequency series resonant converter was tested by simulation. The results suggest that this proposed approach is viable and that the expected performance is comparable to that of a variable frequency series resonant converter

	Comparison study of different choke variants for PV boost converters By Marco JUNG	[View] [Download]
Abstract: This paper presents a comparison study of different choke variants for PV boost converters. A decreased ratio of power to weight and thereby a reduction in material was achieved by increasing the switching frequency and using a new ferrite material. All analysis and simulations were verified in a boost converter demonstrator setup.

	Design and Comparative Analysis of Litz and Copper Foil Transformers for High Frequency Applications By Afia KHAN	[View] [Download]
Abstract: This paper presents the comparative analysis of Copper Foil and Litz wound transformers for high frequency applications. The skin and proximity effects due to eddy currents are analyzed for both windings.The design and selection of foil and Litz windings for a high frequency transformer is discussed, and thedesigned transformers are compared on the basis of their AC resistance factor and leakage inductance. Amethod to reduce the AC resistance factor and leakage inductance for the two winding techniques is alsoproposed. The preference of Foil winding design for a high frequency transformer is validated by meansof experimental results.

	Development of Bus Bar Structure with Low Imbalance in Stray Inductance for Three-phase Silicon Carbide Inverter By Masato ANDO	[View] [Download]
Abstract: This paper presents a three-phase inverter structure for reducing imbalances in the switching loss among power modules connected parallel to one another and among the three phases. The proposed double-sided structure achieved an imbalance of less than 3\% in the experimental switching loss using all-SiC power modules.

	Hybrid magnetic 3-phase Integrated EMI filter By Wai Keung MO	[View] [Download]
Abstract: The integrated EMI filter approach is an effective solution to miniaturize the overall EMI filter dimensions especailly in 3-phase power applications. The hybrid magnetic approach offers synergistic effects by merging benefits of different magnetic materials. This paper describes a design of a hybrid magnetic core integrated into a standard 3-phase EMI filter.

	Linearized Modeling and Controller Design of the Nonlinear Inductors in aß-frame By Shih-Feng CHOU	[View] [Download]
Abstract: The nonlinearity of the inductor affects the stability of the system and the bandwidth of the controller. This paper proposes a linearized method for linearizing the nonlinear inductor in the aß-frame under given load condition. A current controller design method is also proposed in this paper to adapt the equivalent inductance change. The equivalent inductance of a nonlinear inductor depends on the peak current flowing through the inductor in the aß-frame but dissociates to the power factor of the output current. Simulation results and experiment results verify the theoretical derivation.

	Prototyping and testing embedded transformer for 100W 1MHz GaN converter By Marc BOHNKE	[View] [Download]
Abstract: The miniaturization of power converters, and the enhancement of their performances are one of the major challenges in today's power electronic community. At CEA, we are working on integration of active (GaN/Si, GaN IC) and passive (planar transformers, inductors, embedded capacitor) components. Packaging architecture leading to a better integration, and enhanced topologies providing better efficiencies are in the spectra of our roadmap as well. The need for miniaturization and access to better yield are especially addressing the consumer electronic, as for example USB type C power delivery application.The first part of this document is an introduction that highlight the technical challenges and targets of our work. Then, we are focusing on development of ferrite material. Our goal is to design and build proof of concept of a planar core implemented in a printed circuit board. The prototyping of ultra-thin integrated transformer is presented as well as its implementation in a LLC type converter. In this document, we will present the results of measurements; both electrical and thermal measurements will be shown and discussed.