SMP Sintermetalle Prometheus GmbH & Co KG has introduced All Mode EMC filters with a high-frequency stability. The materials developed by SMP specifically for these filters are effective for frequencies up to the gigaHertz range. The All Mode design simultaneously damps both differential mode and common mode noise. The High-Frequency Composite Materials (HFCM) from SMP satisfy all of the requirements of modern SiC and GaN applications. By combining HFCM and All Mode technologies it is possible to reduce the filter components required in a system by about 50 percent — no additional common mode chokes or filters are needed.
EMC filters reduce interference currents and voltage spikes in power converter systems which are generated by parasitic effects and cyclic elements of the system. The material plays an important part in this, as SMP’s Managing Director Johannes Gemenetzis, an engineer with a Master’s degree in Electrical Engineering and Information Technology, explains: “The target is to achieve a stable inductance at the working point over the entire frequency spectrum in order to maximize the interference suppression. Compared to the standard technologies which use materials such as ferrite, electrical steel sheets and nanocrystalline ribbon, the All Mode EMC filters are up to 40 percent lighter and reduce interference levels by as much as 40 dB[µV].”
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