Design and characterization of single-phase power filters
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Doctoral thesis (article-based)
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Date
2009
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Language
en
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Verkkokirja (2020 KB, 80 s.)
Series
TKK dissertations,
194
Abstract
In order to comply with the strict limits on electromagnetic emissions from electrical and electronic equipment, most switch-mode power supplies need an electromagnetic interference (EMI) filter at their input. This dissertation discusses issues related to the design of passive single-phase power filters, such as noise sources, coupling paths, parasitic elements, and suggests analytical tools to simplify and improve the design. The most important recommendations and steps in the design of single-phase power filters are outlined. The starting point in any design procedure is to determine the required insertion loss (IL), which depends on the common-mode (CM) and differential-mode (DM) noise generated by the electrical equipment. This requires the use of noise separators, which split the EMI generated by the equipment under test into its CM and DM components. The advantages and disadvantages of different noise separation techniques are discussed and some of them are shown to be inaccurate. Even when an appropriate noise separator is used, it is necessary to know what kind of data are obtained, because there are different definitions for CM and DM. Misinterpreted or inaccurate data for the CM and DM noise lead to wrong attenuation requirements, the consequence of which is either overdesign, or worse, failure to suppress the noise sufficiently. A major obstacle for predicting the performance of EMI filters are the unknown noise source impedances. Methods for noise source impedance measurement have been suggested in the literature and are discussed in the thesis. These methods are difficult, time-consuming, and some of them incorrect. Traditionally, EMI suppression filters and components are characterized by their IL. In this work two- and four-port network parameters are used to obtain the IL or equivalent circuits of the filter. It is suggested that the "worst-case" IL can be obtained from the chain parameters of the filter or component. Although the concept of IL applies to two-port networks, equations for the CM and DM IL of four-port networks as functions of their four-port network parameters and arbitrary source and load impedances are derived and verified. The four-port network parameters can also be used to obtain the elements of the CM and DM π-type equivalent circuits of a single-phase EMI filter. A new way to define the CM and DM suppression requirements as a part of the total required IL is proposed in the thesis.Description
Keywords
electromagnetic compatibility, insertion loss, passive filters, power filters, scattering parameters
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Parts
- [Publication 1]: Konstantin Kostov, Jorma Kyyrä, and Teuvo Suntio. 2003. Analysis and design of EMI filters for DC-DC converters using chain parameters. In: Proceedings of the 10th European Conference on Power Electronics and Applications (EPE 2003). Toulouse, France. 2-4 September 2003. 10 pages. © 2003 European Power Electronics and Drives Association (EPE Association). By permission.
- [Publication 2]: Konstantin S. Kostov, Jukka-Pekka Sjöroos, Jorma J. Kyyrä, and Teuvo Suntio. 2004. Selection of power filters for switched mode power supplies. In: Proceedings of the 2004 Nordic Workshop on Power and Industrial Electronics (NORPIE 2004). Trondheim, Norway. 14-16 June 2004. 7 pages. © 2004 by authors.
- [Publication 3]: K. S. Kostov, A. Niinikoski, J. Kyyrä, and T. Suntio. 2004. Prediction of the conducted EMI from DC-DC switched-mode power converters. In: Proceedings of the 11th International Power Electronics and Motion Control Conference (EPE-PEMC 2004). Riga, Latvia. 2-4 September 2004. 5 pages. © 2004 Power Electronics and Motion Control Council (EPE-PEMC-C). By permission.
- [Publication 4]: K. S. Kostov, V. Tuomainen, J. Kyyrä, and T. Suntio. 2004. Designing power line filters for DC-DC converters. In: Proceedings of the 11th International Power Electronics and Motion Control Conference (EPE-PEMC 2004). Riga, Latvia. 2-4 September 2004. 6 pages. © 2004 Power Electronics and Motion Control Council (EPE-PEMC-C). By permission.
- [Publication 5]: Konstantin S. Kostov and Jorma J. Kyyrä. 2008. Insertion loss and network parameters in the analysis of power filters. In: Proceedings of the 2008 Nordic Workshop on Power and Industrial Electronics (NORPIE 2008). Espoo, Finland. 9-11 June 2008. 5 pages. © 2008 by authors.
- [Publication 6]: K. S. Kostov and J. J. Kyyrä. 2009. Insertion loss in terms of four-port network parameters. IET Science, Measurement & Technology, volume 3, number 3, pages 208-216. © 2009 by authors and © 2009 The Institution of Engineering and Technology (IET). By permission.
- [Publication 7]: Konstantin Kostov and Jorma Kyyrä. 2009. Common-mode choke coils characterization. In: Proceedings of the 13th European Conference on Power Electronics and Applications (EPE 2009). Barcelona, Spain. 8-10 September 2009. 9 pages. © 2009 European Power Electronics and Drives Association (EPE Association). By permission.