Amorphous Cores and Nanocrystalline Cores

Amorphous cores and nanocrystalline cores are ideally suited to being used in the function of common mode chokes.

The high permeability represents the opportunity for high inductance values that aids the suppression of the unwanted asymmetric conducted noise, interference and stray signals. Apart from the high permeability the core material also has a high magnetic flux saturation density, the transformers made from these cores have very accurate and repeatable values and characteristics. They lend themselves to miniaturisation.

There are a wide range of core dimensions available, and the flat stable thermal characteristics allow them to be used over a wide temperature range. Designs based on nanocrystalline products can offer maximum attenuation in a compact package for many EMI situations. The choke design will depend on the specific interference suppression issues within a particular product. These products are used extensively in renewable energy, electric motor drivers and electric vehicle charging applications.

The common mode choke can be found in many day-to-day applications including switch mode power supplies, photovoltaic inverter circuitry and almost anywhere there is a power supply function involved like arc welding apparatus.