EPE Association: EPE 1991 - 02 - Session 1.2: PASSIVE COMPONENTS

EPE 1991 - 02 - Session 1.2: PASSIVE COMPONENTS
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   Inductor design concepts tor high frequency applications
By W. M. Chew; P. D. Evans; W. J. B. Heffernan [View]
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Abstract: The economic and effective design of inductors and coupled inductors for high frequency applications in power supply circuits is now more difficult because of the higher switching frequencies that are being used. This paper presents a theoretical and experimental study of the benefits of using distributed airgaps to improve the internal leakage field pattern in planar inductors thereby reducing eddy current losses in the conductors.

   A COMPARISON OF HIGH FREQUENCY POWER TRANSFORMER TOPOLOGIES
By W. J. B. Heffernan; P. D. Evans; W. M. Chew [View]
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Abstract: Recent advances in switching device technology and power converter circuit topologies have enabled unprecedented increases in power conversion density by allowing greatly increased switching frequencies, which permit the use of much smaller energy storage and transformation components. Although a great number of papers describing such converter circuits have appeared, work remains to be done to optimise the power transformer itself which is often the largest component in the circuit. Recent literature has investigated the planar transformer, which has aroused interest due to its ease of construction and inherent low profile. The present paper uses established theory, magnetostatic modelling and experimental results to provide a comparison between the planar transformer and the conventional, concentrically wound component, optimised for high frequency operation, revealing possible limitations in the former and potential superior efficiency to volume performance of the latter.

   MODELLING OF PASSIVE MAGNETIC COMPONENTS
By J. P. Masson; J. J. Rousseau; B. Lefebvre; F. Marthouret [View]
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Abstract: ln power electronics, the passive magnetic components are used under particular conditions. The high spectrum waveforms and the high magnitude of the inputs restrict the validity of the equivalent circuit modelisation. This text reports for simple-shaped magnetic circuits, a representation technique taking into account the hysteresis, the saturation and the eddy-currents phenomena. The measured values are compared to the results issued from this method on two industrial cases involving different problems: predominance of hysteresis phenomenon on a sensor, non-linear loading conditions for a transformer. In both cases good results are obtained with very low computer times.

EPE 1991 - 02 - Session 1.2: PASSIVE COMPONENTS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1991 - Conference > EPE 1991 - 02 - Session 1.2: PASSIVE COMPONENTS
	[return to parent folder]

	Inductor design concepts tor high frequency applications By W. M. Chew; P. D. Evans; W. J. B. Heffernan	[View] [Download]
Abstract: The economic and effective design of inductors and coupled inductors for high frequency applications in power supply circuits is now more difficult because of the higher switching frequencies that are being used. This paper presents a theoretical and experimental study of the benefits of using distributed airgaps to improve the internal leakage field pattern in planar inductors thereby reducing eddy current losses in the conductors.

	A COMPARISON OF HIGH FREQUENCY POWER TRANSFORMER TOPOLOGIES By W. J. B. Heffernan; P. D. Evans; W. M. Chew	[View] [Download]
Abstract: Recent advances in switching device technology and power converter circuit topologies have enabled unprecedented increases in power conversion density by allowing greatly increased switching frequencies, which permit the use of much smaller energy storage and transformation components. Although a great number of papers describing such converter circuits have appeared, work remains to be done to optimise the power transformer itself which is often the largest component in the circuit. Recent literature has investigated the planar transformer, which has aroused interest due to its ease of construction and inherent low profile. The present paper uses established theory, magnetostatic modelling and experimental results to provide a comparison between the planar transformer and the conventional, concentrically wound component, optimised for high frequency operation, revealing possible limitations in the former and potential superior efficiency to volume performance of the latter.

	MODELLING OF PASSIVE MAGNETIC COMPONENTS By J. P. Masson; J. J. Rousseau; B. Lefebvre; F. Marthouret	[View] [Download]
Abstract: ln power electronics, the passive magnetic components are used under particular conditions. The high spectrum waveforms and the high magnitude of the inputs restrict the validity of the equivalent circuit modelisation. This text reports for simple-shaped magnetic circuits, a representation technique taking into account the hysteresis, the saturation and the eddy-currents phenomena. The measured values are compared to the results issued from this method on two industrial cases involving different problems: predominance of hysteresis phenomenon on a sensor, non-linear loading conditions for a transformer. In both cases good results are obtained with very low computer times.