SMP Sintermetalle Prometheus has developed "All Mode" EMC filters with high frequency stability. The specially produced HFCM materials (High Frequency Composite Materials) are effective for frequencies up into the gigahertz range and meet all the requirements of modern SiC and GaN applications. The all mode construction dampens both differential mode and common mode disturbances.
Combining HFCM and All Mode technology requires approximately 50% fewer filter components in the system. This allows, among other things, the renunciation of additional common mode chokes or filters.
EMC filters reduce noise currents and voltage spikes in power converter systems, which are generated by parasitic effects and clocking elements of the power converter system. Here, the material plays a crucial role, as Johannes Gemenetzis, graduate engineer for electrical and information technology (M.Sc.) and CEO of SMP, explains: "The goal is to achieve a stable inductance at the operating point over the entire frequency spectrum, to maximize the attenuation of the disturbances. Compared to standard technologies with materials such as ferrite, electrical sheets and nanocrystalline sheets, the All Mode EMC filters have up to 40 dB [μV] lower noise levels and are up to 40% lighter. "
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Due to the magnetostriction-free materials, the All Mode filters produce no noise. "We realize our EMC filters because of the inductance stability with smaller inductance, which allows a high dynamics of the system. The voltage peaks, which occur periodically with the clock frequency of the inverter, are reduced immensely. This significantly increases the service life of the electric motors. The very low losses of the materials additionally improve the efficiency of the overall system. Furthermore, fewer filter components are necessary. The fast-switching SiC and GaN semiconductors place high demands on the magnetic materials. "
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