Nanocrystalline cores deliver 20x more permeability
Designed to reduce broadband mains-borne radio interference, chokes with nanocrystalline cores have been introduced by Würth Elektronik. The WE-CMBNC family of current-compensated, common-mode chokes have been made with nanocrystalline cores and feature broadband attenuation.
The company claim that the cores have 20 times more permeability when compared with conventional cores made of MnZn and NiZn core materials. Mains borne interference can thus be reduced down into the low kHz frequency range, where conventional NiZn and MnZn cores have very little attenuative effect.
High levels of attenuation can be achieved, even in high frequency ranges, due to the low winding capacitance. The chokes' Currie temperature is about three times higher than conventional cores, meaning push-pull interference cannot result in saturation of the mains choke.
Ex-warehouse chokes are available, as is design kits for developers and EMC labs.
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