The latest edition of the CMC (common mode choke) sample kit from Vacuumschmelze, contains a selection of nanocrystalline CMC from the latest range, in designs that conform to UL standards using suitable plastics compliant with the UL-1446 standard for insulation materials. The kit includes an assortment of two winding CMC for single phase applications in flat and upright designs as well as a number of three and four winding chokes for three-phase applications. The chokes are designed for operating currents ranging from 4 to 48A and for operating voltages from 300 to 1000V.
VITROPERM is a nanocrystalline alloy offering a permeability range from 5,000 to over 150,000, combined with high saturation flux density of 1.2T. The material properties of the alloy allow the dimensions of chokes to be reduced by a factor of three in comparison to conventional ferrite chokes, claims the company.
Nanocrystalline CMC delivers good broadband attenuation, determined in the low-frequency range by the high level of material permeability and at high frequencies by the low winding capacitance, according to the company. In many cases, this broadband attenuation characteristic is claimed to allow the development of EMI filters with a low component count by reducing the number of filter stages.
