Electronic and electromechanical components manufacturer Würth Elektronik eiSos has developed current-compensated common-mode chokes with nano-crystalline cores to reduce broadband mains-borne radio interference. Common-mode chokes are typically used as inline filters for this purpose.
The new WE-CMBNC product family features nano-crystalline cores and offers broadband attenuation. Compared to conventional cores made of MnZn and NiZn core materials, nano-crystalline cores have 20 times more permeability, allowing mains-borne interference to be reduced down into the low kHz frequency range, where conventional NiZn and MnZn cores have very little attenuation effect.
High levels of attenuation can be achieved even in high frequency ranges due to the low winding capacitance. Compared with conventional cores, their Currie temperature is about three times higher, so push-pull interference cannot result in saturation of the mains choke.
All mains chokes are available ex warehouse. Design kits are also available for developers and EMC labs.