EPE Association: EPE 2007 - Subtopic 02-1 - LS: Passive components and integrated passive components

EPE 2007 - Subtopic 02-1 - LS: Passive components and integrated passive components
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2007 - Conference > EPE 2007 - Topic 02: 'Passive components, system integration & packaging' > EPE 2007 - Subtopic 02-1 - LS: Passive components and integrated passive components

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   Core loss model for nanocrystalline cores for full and half bridge waveforms
By Georgi Nikolov; Vencislav Valchev; Alex Van den Bossche [View]
[Download]

Abstract: Nanocrystalline soft magnetic materials combine low magnetic losses with high permeability and high saturation induction. Those properties are useful for power electronics. The linear behaviour below saturation allows superposition of losses in the frequency domain. The losses of three toroidal Vitroperm 500F cores are investigated under square voltage.

   Dynamic Iron Loss Measurement Method for an AC Filter Inductor on a PWM Inverter
By Kwanryol Kim; Toshihisa Shimizu [View]
[Download]

Abstract: An iron loss measurement method for ac filter inductors used on PWM inverters is proposed in this paper. A distinctive feature of this method is that the iron loss of the ac filter inductor can be individually measured in each switching period, thereby allowing the loss distribution during one cycle of output frequency to be observed easily. The measurement system is composed of a PWM generator, an inverter, a voltage and a current sensor, a high-speed sampling digital recorder, and a computer with loss calculation software specially developed by the authors. The iron losses caused by both the high-frequency switching ripple current and the low-frequency output current are measured, and are displayed graphically on a monitor.

   A New Model for the Determination of Copper Losses in Transformer Windings with Arbitrary Conductor Distribution under High Frequency Sinusoidal Excitation
By G. S. Dimitrakakis; E. C. Tatakis; E. J. Rikos [View]
[Download]

Abstract: Magnetic components (inductors and transformers), when present in power electronics converters, consist undoubtedly, along with the semiconductor switches, the main power loss contribution. This fact emerges the necessity of having some easily applicable tools for their effective resistance accurate calculation. The up to now widely used relative theoretical or empirical formulas have been extracted under assumptions or experimental conditions that invalidate their results over several application cases. Some lately released computer aided analyses, though useful, do not make it to escape from the strictly bounded logic and assumptions on which the previous formulas were based. In this paper a new expression for the calculation of high frequency copper losses in transformer and inductor coils with round conductors, more general than the existent models and without any of the traditionally imposed assumptions and limitations, is proposed and established by finite element analysis (FEA) and measurement results. No complicated tables with coefficient numerical values are necessary and the final formula extracted is simple and ready to use. Additional to this work, a comparison between the results determined by the existent theoretical analyses and FEA clarifies their discrepancy over specific ranges of the several parameters involved.

EPE 2007 - Subtopic 02-1 - LS: Passive components and integrated passive components
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2007 - Conference > EPE 2007 - Topic 02: 'Passive components, system integration & packaging' > EPE 2007 - Subtopic 02-1 - LS: Passive components and integrated passive components
	[return to parent folder]

	Core loss model for nanocrystalline cores for full and half bridge waveforms By Georgi Nikolov; Vencislav Valchev; Alex Van den Bossche	[View] [Download]
Abstract: Nanocrystalline soft magnetic materials combine low magnetic losses with high permeability and high saturation induction. Those properties are useful for power electronics. The linear behaviour below saturation allows superposition of losses in the frequency domain. The losses of three toroidal Vitroperm 500F cores are investigated under square voltage.

	Dynamic Iron Loss Measurement Method for an AC Filter Inductor on a PWM Inverter By Kwanryol Kim; Toshihisa Shimizu	[View] [Download]
Abstract: An iron loss measurement method for ac filter inductors used on PWM inverters is proposed in this paper. A distinctive feature of this method is that the iron loss of the ac filter inductor can be individually measured in each switching period, thereby allowing the loss distribution during one cycle of output frequency to be observed easily. The measurement system is composed of a PWM generator, an inverter, a voltage and a current sensor, a high-speed sampling digital recorder, and a computer with loss calculation software specially developed by the authors. The iron losses caused by both the high-frequency switching ripple current and the low-frequency output current are measured, and are displayed graphically on a monitor.

	A New Model for the Determination of Copper Losses in Transformer Windings with Arbitrary Conductor Distribution under High Frequency Sinusoidal Excitation By G. S. Dimitrakakis; E. C. Tatakis; E. J. Rikos	[View] [Download]
Abstract: Magnetic components (inductors and transformers), when present in power electronics converters, consist undoubtedly, along with the semiconductor switches, the main power loss contribution. This fact emerges the necessity of having some easily applicable tools for their effective resistance accurate calculation. The up to now widely used relative theoretical or empirical formulas have been extracted under assumptions or experimental conditions that invalidate their results over several application cases. Some lately released computer aided analyses, though useful, do not make it to escape from the strictly bounded logic and assumptions on which the previous formulas were based. In this paper a new expression for the calculation of high frequency copper losses in transformer and inductor coils with round conductors, more general than the existent models and without any of the traditionally imposed assumptions and limitations, is proposed and established by finite element analysis (FEA) and measurement results. No complicated tables with coefficient numerical values are necessary and the final formula extracted is simple and ready to use. Additional to this work, a comparison between the results determined by the existent theoretical analyses and FEA clarifies their discrepancy over specific ranges of the several parameters involved.