EMC filters reduce interference currents in converter systems that are generated by parasitic effects and clocking elements of the converter system. SMP Sintermetalle has developed EMC filters with high frequency stability. The specially manufactured materials for the new filters are effective for frequencies up into the gigahertz range. The material plays an important role in EMC filters: The aim is to achieve stable inductance across the entire frequency spectrum in order to maximize the attenuation of interference.
Compared to standard technologies with materials such as ferrite, electrical sheets and nanocrystalline sheets, the new EMC filters have a noise level that is up to 40 dB [µV] lower and are up to 30% lighter.
Due to the magnetostriction-free materials, they do not generate any noise. Due to the very low losses of the materials, the overall efficiency of the system is improved. Furthermore, fewer filter components are required, which reduces the volume and significantly increases the economy of the overall power electronic system. The filters can be implemented with individual or magnetically coupled chokes and thus offer a selection to reduce common and differential mode interference.
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