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NORpie 2008 - Topic 03: CONVERTERS
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	Current-Sourced Buck Converter   By Jari Leppäaho, Matti Karppanen, Teuvo Suntio	[View]   [Download]
Abstract: Solar and magnetic energy harvesting may benefit from the use of current-sourced converters for interfacing those sources into the practical usage due to their current-source nature. The paper investigates the implementation and dynamics of such converters by means of a current-sourced buck converter. Duality concepts are applied to obtain the converter from the corresponding voltage-sourced buck converter. The dynamic analysis is carried out in continuous capacitor-voltagemode under direct-duty-ratio control. The theoretical findings are verified by extracting the transfer functions from the Matlabâ„¢-Simulink-based switching models.
	Insertion Loss and Network Parameters in the Analysis of Power Filters   By Konstantin S. Kostov , Jorma J. Kyyrä	[View]   [Download]
Abstract: The insertion loss (IL) is regarded as the best interference suppression characteristic of power filters or suppression components. The IL definitions are considered and as an alternative the paper suggests the use of network parameters. It is a known fact that the standard IL measurements do not provide reliable information about the operational performance of a suppressor. This is largely due to the source and load mismatch, which is typical in power lines. Arguments are presented, showing that network parameters allow for more complete and reliable characterization of power filters and components. The IL would not be abandoned, because the network parameters provide enough information to obtain not only the standard IL, but also the IL in a non 50 Ω system. A new treatment of “worst case” or minimum IL is proposed, which is also based on network parameters. Furthermore, input, output, or transfer impedances, simulation models, and other characteristics, can be obtained from the network parameters, but not from the currently published standard IL data.
	High frequency winding design for planar switch mode transformers   By André Büttner, Arne Nysveen, Magnar Hernes	[View]   [Download]
Abstract: Switch mode power supplies as a mass produced article leave room for optimization especially at the voluminous magnetic components. Hereby planar component designs can reduce the overall height of the power supply and give it a more compact design. Since cores are available in standard sizes the optimal winding layout has to be found. Due to increased parasitic capacitance interleaving is not a good option to reduce losses in the windings at high frequency resonant power supplies. This article presents and evaluates different winding designs for resonant switch mode transformers operating in power supplies with frequencies larger than 500kHz. This article shows that the revolved parallel design performs best of the tested designs under the given conditions. In addition, the revolved design can compete with solutions as planar litz when it comes to value meaning cost and production complexity. Furthermore, the article shows the abilities of a heat measurement prototype.